JPH07118601B2 - Notch filter and notch diplexer using the notch filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In a color television broadcasting apparatus, a constant impedance notch diplexer (hereinafter,
The CIN diplexer is abbreviated) to absorb and remove spurious and synthesize the video carrier, the video color subcarrier, and the audio carrier. The present invention relates to a notch filter suitable for components of a CIN diplexer that synthesizes waves and a notch diplexer using the notch filter.

[0002]

2. Description of the Related Art FIG. 10 is a cross-sectional view showing a main part of a notch filter composed of a semi-coaxial resonator, which is conventionally used as a constituent element of a CIN diplexer for high power such as broadcasting equipment in a very high frequency (VHF) band. Reference numeral 12 is an outer conductor, 13 is a semi-coaxial resonance element, 14 is an input / output coupling loop, 15 is a coaxial line for coupling with an external circuit, and 16 is a stub for compensating rising or falling characteristics. FIG. 11 is a cross-sectional view showing the main part of a notch filter composed of a rectangular waveguide resonator that has been conventionally used as a constituent element of a CIN diplexer for high power such as broadcasting equipment in the ultra high frequency (UHF) band. Is a waveguide wall, and other reference numerals are the same as in FIG.

[0003]

In both of the conventional notch filters shown in FIGS. 10 and 11, the coaxial line 15 for coupling with an external circuit has an external conductor 12 (FIG. 10) or a waveguide wall 17.
(FIG. 11), a stub 16 for compensating the rising or falling characteristics is also provided outside the outer conductor 12 or the waveguide wall 17, and projects in a direction perpendicular to the coaxial line 15. Since it is provided in such a manner, the shape becomes complicated and large. Also, using these notch filters
When constructing a CIN diplexer, two sets of two notch filters are connected in series, and a total of four notch filters are inserted and connected between the distribution output terminals of the two hybrid coupling circuits. Therefore, the overall configuration becomes extremely complicated and large.

[0004]

According to the present invention, a common shield case is divided by a partition wall made of a conductor.
Each shield case and a metal plate whose one end is fixed to the lower wall of each of the two separately formed shield cases are substantially
An inductance forming portion formed by bending the same in a U-shape or bending in an inverted U shape and the other end of each inductance forming portion and a capacitance forming portion between the other end and the lower wall of the shield case facing the other end. and the ring resonant element, through said partition wall, said decorated on two shield case divided form a common input-output coupling line comprises <br/> a Rutotomoni, two shield case divided form of
From the ring resonant element inside one shield case
The resonance frequency of one of the resonators is made relatively low,
Inductance of the ring resonant element in this one resonator
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the lower wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And indanyl ring resonant elements in the one resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
And the center point of the longitudinal direction is included in substantially the same plane, this one
Length of common input / output coupling line in the resonator
Is the electrical length, and is 1/2 or more of the resonance wavelength of this one resonator.
Formed below and its characteristic impedance is the characteristic of the external circuit.
Two pieces that are divided and formed in comparison with the impedance
Of the other shield case of the
The resonance frequency of the other resonator composed of the ring resonance element is compared.
Rings in the other resonator formed relatively high
Of the inductance forming portion of the resonant element, the shield
Both edges and the rising edge of the rising part orthogonal to the lower wall of the case
Smell in the space surrounded by the four edges of both sides
Center axis perpendicular to the bottom wall of the shield case, and
Of the common input / output coupling line part in the other resonator of
A ring in the other resonator that is orthogonal to the longitudinal direction.
Space surrounded by the inductance forming part of the resonant element
With the central axis in the
The longitudinal center of the force-coupled line is almost flush with the center.
A common input / output coupling within this other resonator included
The length of the line part is the electrical length, and the resonance of this other resonator
Formed at less than half the wavelength and set its characteristic impedance
The conventional defect is eliminated by realizing a notch filter formed higher than the characteristic impedance of an external circuit and a notch diplexer using this notch filter.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a sectional view showing an embodiment of the present invention [a sectional view taken along the line CC of FIG. 1B], and FIG.
1A is a cross-sectional view taken along line AA, and FIG. 1C is B in FIG. 1A.
1 is a common shield case, 2 is a partition wall made of a conductor, and the inside of the common shield case 1 is almost 2
Divide into equal parts. 3 ₁ is the inductance forming part of the ring resonant elements, is curved in substantially U-shape in the bent or inverted U-shaped conductor plate of appropriate width, of the common wall surface of the shield case 1 at one end, for example, the lower wall And the other end is bent so as to be parallel to the lower wall of the common shield case ₁ to form the capacitance forming portion 41. 5 ₁ in the solid dielectric, is interposed between the capacitance forming portion 4 ₁ and the common bottom wall of the shield case 1, and between the solid dielectric 5 ₁ between the capacitance forming portion 4 ₁ and the solid dielectric 5 ₁ It is fixed to the lower wall of the common shield case 1 by means such as using an appropriate adhesive. 6
Reference numeral ₁ is a movable electrode plate, 7 ₁ is a drive screw thereof, and 8 ₁ is a lock nut, which form a fine adjustment element of the resonance frequency. 9 ₁ input and output coupling line, are provided so as to be perpendicular to the resonance length direction of the ring resonant elements formed by the inductance formation section 3 ₁ and the capacitor forming portion 4 _1. The resonance length of the ring resonant elements is a longitudinal length in case of returning the bent portion of the inductance formation section 3 ₁ earnestly stretched into a flat plate shape, the resonance length direction, the longitudinal direction, i.e.,
Of the inductance formation section 3 _1, it is a direction of a portion perpendicular to the common bottom wall of the shield case 1. And the present invention
In, among the inductance formation section 3 _1, the common
Both edges of the rising part orthogonal to the lower wall of the shield case 1
Surrounded by a total of 4 edges,
The central axis of the space, that is, the shield cable that passes through this space.
Central axis output coupling line which is perpendicular to the lower wall of the scan 9 ₁ in the longitudinal
Formed so that the center point of the direction is included in almost the same plane
I am doing it. 3 ₂ is an inductance forming portion of the ring resonance element, 4 ₂ is a capacitance forming portion, 5 ₂ is a solid dielectric, 6 ₂ is a movable electrode plate, 7 ₂ is a drive screw, 8 ₂ is a lock nut, and 9 ₂ is an input / output coupling. In the line, these are the inductance forming portion 3 ₁ and the capacitance forming portion 4 of the ring resonant element provided on the left side of the partition wall 2.
₁ , solid dielectric 5 ₁ , movable electrode plate 6 ₁ , drive screw 7 ₁ ,
The lock nut 8 ₁ and the input / output coupling line 9 ₁ have substantially the same configuration, and the input / output coupling line 9 ₂ and the inductance forming portion 3 are provided.
Machine the ring resonant element made of ₂ and the capacitor forming portion 4 ₂
The input / output coupling line 9 provided on the left side of the partition 2
Than ₁ and the inductance forming part _{3 1} and the capacitor forming portion _{4 1}
This is similar to the mechanical arrangement relationship with the ring resonance element .

The input / output coupling lines 9 ₁ and 9 ₂ are integrally coupled at a location corresponding to a hole 10 formed in a part of the partition wall 2,
Each end is connected to each inner conductor of the coaxial connectors 11 ₁ and 11 ₂ . Then, output the length of the coupling line 9 _1, a common by a partition wall 2 at the resonant wavelength electrical length [FIGS. 1 (a) the boundary sheet - form to the scan 1 of the left half (toward the drawing) - Rudoke is _^1/2 or less of the resonance wavelength on the ring resonator is, the length of the input and output coupling line 9 _2, the resonance wavelength in electrical length [Figure 1 common to the partition wall 2 as a boundary in the (a) sheet - Rudoke - scan to _^1/2 or less of one right resonance wavelength of the ring resonator formed in half, along with selected, respectively, the relatively large diameter of the input-output coupling line 9 _1, the input-output coupling line 9 ₂ It has a relatively small diameter. The input / output coupling lines 9 ₁ and 9 ₂ may be separately formed, and both lines may be integrally coupled by welding or the like. However, one rod-shaped conductor may have a relatively large diameter and a portion of the other may be coupled. The diameter may be formed to be comparatively small, and it may be provided in a common shield case 1 through a hole 10 formed in a part of the partition wall 2. In either case, input and output coupling line 9 ₁ and 9 ₂ can be carried round bar or square bar conductors, also the present invention formed by any of such as a plate-like conductor or microstrip line.

Incidentally, the capacitance forming portion 4 ₁ (or
The bending direction of 4 ₂ ) is, as shown in the figure, toward the outside of the space surrounded by a part of the lower wall of the shield case 1 common to the inductance forming part 3 ₁ (or 3 ₂ ) of the ring resonant element. Instead of folding like this, it may be folded in the opposite direction. A shield case common to the capacitance forming unit 4 ₁ (or 4 ₂ )
Instead of interposing the solid dielectric 5 ₁ (or 5 ₂ ) between the lower wall of the case 1 and the lower wall of the shield case 1 which is common to the capacitance forming portion 4 ₁ (or 4 ₂ ). , the insulator than made compact space - can be fixed to the lower wall of the scan 1 - suitably number interposed therebetween by volume forming unit 4 ₁ (or 4 ₂₎ common sheet - Rudoke. Without bending the other end of the inductance forming portion 3 ₁ (or 3 ₂ ) of the ring resonance element, an electrode plate is attached to the other end in a T shape, and a common shield cable is provided via a solid dielectric or an insulating spacer. -The capacitance forming part may be fixed to the lower wall of the case 1 and the lower end of the shield case 1 common to the other end of the inductance forming part 3 ₁ (or 3 ₂ ) of the ring resonant element. A capacitance element such as a fixed-capacity ceramic capacitor or a butterfly-type variable capacitance capacitor may be interposed between the two.

2 and 3 are cross-sectional views of the essential part showing the electromagnetic field distribution of the notch filter of the present invention. FIG. 2 is a cross-sectional view corresponding to the left side portion of the partition wall 2 in FIG. Is
In the cross-sectional view corresponding to FIG. 1B, the reference numerals in both figures are the same as those in FIG. 1, and in both figures, the solid line with an arrow indicates an electric field, and the broken line with an arrow and a black dot in a circle. The symbols with a cross represent magnetic fields. As is apparent from both figures, the magnetic field is related to the input and output coupling line 9 ₁ mode - de and magnetic fields related to the ring resonant elements mode - de each other Kurosumo - becomes de, electric field mode related to the input and output coupling line 9 ₁ - field related to de and the ring resonant element mode - de common mode together - since it is de, coupled between the input and output coupling line 9 ₁ and the ring resonant element becomes electric field coupling. Coupling capacitance between the input and output coupling line 9 ₁ and the ring resonant element is when made smaller than the required amount, coupled pro therebetween - it is possible to adjust the coupling capacitance by interposing the blanking or coupling capacitor plate. If the coupling capacitance between the input and output coupling line 9 ₁ and the ring resonant element becomes small, the coupling is loose and become in high loaded Q resonator formed, if the coupling capacitance is large, the coupling is tightly As a result, a resonator having a low load Q is formed. The right side of the partition wall 2 in FIG.
The electromagnetic field distribution of the ring resonator shown in (c) is the same as that shown in FIGS. 2 and 3, and the coupling relationship between the input / output coupling line 9 ₂ and the ring resonant element is the same as that of the input / output coupling line 9 ₁ and the ring. This is exactly the same as the coupling relationship between the resonant elements.

[0009] Figure 4 is an equivalent circuit diagram of the present invention the notch filter, the input-output coupling line 9 _1, so is formed in a relatively large its diameter, than the characteristic impedance to the characteristic impedance of the external circuit becomes capacitive coupling line is low, the input-output coupling line 9 _2, so is formed in a relatively small the diameter, inductive coupling becomes high its characteristic impedance than the characteristic impedance of the external circuit Become a railroad track. Therefore, the equivalent circuit diagram of FIG. 4 can be rewritten as the equivalent circuit diagram shown in FIG. In and out
And the center point of the longitudinal force coupling line 9 _1, ring resonant elements
And rising portion of the inductance formation section 3 ₁ to form a
Center in the space surrounded by each edge of the falling part
The axes are formed so that they are included in substantially the same plane.
Because as defined above, the inductance formation section 3 ₁ 及
Formed by the ring resonant element made of fine capacitor forming portion 4 ₁
The resonance circuit R ₁ is arranged in the longitudinal direction of the input / output coupling line 9 ₁ .
Connected to the center point of. Resonant frequency f _L of the resonant circuit R ₁
The When determining the circuit constant so appropriately lower than the transmission frequency, input-output coupling line on the left side of the partition wall 2 9 ₁ and co
The vibration circuit R ₁ allows the induction m-type high frequency filter as shown in FIG.
A corrugator is formed. The length of the input and output coupling line 9 _1, electrical
The length is selected to be 1/2 or less of the resonance wavelength of the resonance circuit R _1.
Since it is as described above, the resonance circuit R ₁ and the
The length from the connection point of the force coupling line 9 ₁ to the left and right of the line ends
Are electric lengths, respectively, and are 1 / resonance of the resonance wavelength of the resonance circuit R _1.
It will be 4 or less. Whether the line length is 1/4 wavelength or less, 1
/ 4 wavelength or more, the equivalent reactance of the line
Is switched from inductive to capacitive and vice versa.
There is a cunning fear, but input-output coupling line 9 ₁ in the longitudinal direction of the
The length from the center point to the left and right line ends is the resonance circuit.
Since it is less than 1/4 of the resonance wavelength of R _1, the input / output coupling line
9 ₁ equivalent reactance is kept capacitive, input-output coupling
Equivalent reactance (capacitive) of line 9 ₁ and resonance circuit R ₁
And the inductive reactance component in ## EQU1 ## cancel each other out, and the rise of the transmission characteristic in the frequency region higher than the resonance frequency f _L of the resonance circuit R ₁ becomes sharp.
Resonant circuit composed of ring resonant elements on the right side of the partition wall 2
R ₂ is also against the longitudinal center point of the input-output coupling line 9 ₂
Therefore, the resonance frequency f _H of the resonance circuit R ₂ is transmitted.
If the circuit constant is selected to be appropriately higher than the wave number,
Figure 5 shows the input and output coupling lines _{9 2} and the resonance circuit _{R 2}
Thus, an inductive m-type low pass filter is formed. Input / output connection
The length of the coupling line 9 _2, in electrical length, the resonance wave of the resonance circuit R ₂
The length of 1/2 or less, in the input-output coupling line 9 _second longitudinal
The length from the center point to the left and right line ends is the resonance circuit R
_{Since it is} less than 1/4 of the resonance wavelength of ₂ , the input / output coupling line
9 ₂ equivalent reactance is kept inductive, input and output coupling
Line _{9 2} equivalent reactance (inductive) and the resonant circuit _{R 2}
And the capacitive reactance component of the resonance circuit cancel each other out, and the fall of the transmission characteristic in the frequency region lower than the resonance frequency f _H of the resonance circuit R ₂ becomes sharp. Therefore, the rise and fall of the pass band between the resonance frequencies f _L and f _H become steep, and the transmission characteristics in the pass band can be improved. FIG. 6 is a diagram showing an example of the transmission characteristics of the notch filter of the present invention, where the horizontal axis is frequency and the vertical axis is attenuation.

FIG. 7 is a diagram showing an example of a CIN diplexer constructed by combining the notch filter of the present invention with a hybrid coupling circuit. HYB ₁ and HYB ₂ are hybrid coupling circuits, for example, 90 ° between distributed output signals. It consists of a 90 ° hybrid coupling circuit that causes a phase difference and the level reduction of the distribution output signal is 3 dB. T _V and T _A are input terminals, T _{V A}
Is an output terminal, T _ISL is an isolation terminal, NF ₁ and NF
Reference numeral ₂ is a notch filter of the present invention, R _1L and R _2L are ring resonators on the low resonance frequency side, and R _1H and R _2H are ring resonators on the high resonance frequency side. The present invention notch filter
Of the ring resonators constituting NF ₁ and NF ₂ , each resonance frequency of the ring resonators R _1H and R _2H on the high resonance frequency side, respectively, for example, in the sound carrier f _A in the color television broadcast wave, Ring resonator with lower resonance frequency
When each resonance frequency of R _1L and R _2L is set to f _V −f _S (f _V is a video carrier and f _V −f _S is an unnecessary wave generated in the transmitter), the video is input to T _V. Carrier waves f _V and f _V −f _S
With added, the addition of sound carrier f _A to an input terminal T _A, is output composite wave of the picture carrier f _V and sound carrier f _A from the output terminal T _VA, isolator - Deployment from the terminal T _ISL f _V -f _S
Is output and absorbed by a non-reflecting terminator (not shown).

FIG. 8 shows the transmission characteristics of the CIN notch diplexer of the present invention shown in FIG. 7, that is, from the input terminal T _V to the output terminal.
FIG. 6 is a diagram showing an example of a transmission characteristic reaching T _VA or a transmission characteristic reaching from the input terminal T _A to the isolation terminal T _ISL , and the horizontal axis and the vertical axis are the same as those in FIG. FIG. 9 shows the present invention shown in FIG.
Between input terminal T _A and output terminal T _VA of CIN notch diplexer or input terminal T _V and isolation terminal T _ISL
It is a figure which shows an example of the transmission characteristic between, and the horizontal axis and the vertical axis are the same as that of FIG.

[0012]

The ring resonance element forming the notch filter of the present invention can be made to have a large mechanical strength by forming it with a metal plate having an appropriate thickness according to the resonance wavelength, and the inductance forming portion. Since the base portion and the capacitance forming portion are fixed to the lower wall of the common shield case, the entire resonant element can be formed to have sufficient mechanical strength. Since the inductance forming portion of the ring resonant element can be formed by simply bending or bending a metal plate, it is easy to process. Since the length in the longitudinal direction is relatively short with respect to the width of the ring resonant element, the size can be reduced. Since the length in the longitudinal direction is relatively short with respect to the width of the ring resonant element, the impedance is low, and the current flowing through the resonant element is relatively large. However, since the width of the resonant element is relatively wide, the current density is Even if the current becomes relatively small and heat is generated by this current, the surface area of the resonant element is relatively large, so that the heat dissipation effect is good and the temperature rise can be suppressed, and therefore the power capacity is large. Since the impedance of the ring resonance element is low, the voltage generated in the resonance element is also low,
Good withstand voltage characteristics. The notch filter of the present invention including such a ring resonant element is mechanically robust, can be downsized, and has excellent electrical characteristics. In the notch filter of the present invention, only the outer end of the driving screw in the resonance frequency fine adjustment element projects to the outside of the common shield case, and the input / output coupling line is incorporated in the common shield case. Therefore, the shape is extremely simple and compact. In the notch filter of the present invention, by appropriately adjusting the characteristic impedance of the input / output coupling line, it is possible to serve also as a compensating element for the rise or fall of the transmission characteristic, so that the rise or fall characteristic as in the conventional case. It is not necessary to provide a compensating stub in particular, and in this respect as well, the whole can be formed in a simple and small size. In the CIN notch diplexer constructed by using the notch filter of the present invention, it is not necessary to use four independent notch filters as in the conventional case, and two ring resonators are provided in a common shield case. Since it is sufficient to use only two notch filters, it is not necessary to connect the notch filters to each other as in the conventional case, and the notch filter of the present invention itself is small. Therefore, the entire CIN notch diplexer can be made extremely simple and compact. It becomes possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing an electromagnetic field distribution of the notch filter of the present invention.

FIG. 3 is a sectional view of an essential part showing an electromagnetic field distribution of the notch filter of the present invention.

FIG. 4 is an equivalent circuit diagram of the notch filter of the present invention.

FIG. 5 is an equivalent circuit diagram of the notch filter of the present invention.

FIG. 6 is a diagram showing an example of transmission characteristics of the notch filter of the present invention.

FIG. 7 is a diagram showing a notch diplexer using the notch filter of the present invention.

FIG. 8 is a diagram showing an example of transmission characteristics of the notch diplexer of the present invention.

FIG. 9 is a diagram showing an example of transmission characteristics of the notch diplexer of the present invention.

FIG. 10 is a cross-sectional view showing a conventional notch filter.

FIG. 11 is a sectional view showing a conventional notch filter.

[Explanation of symbols]

1 Common shield case 2 Partition 3 ₁ and 3 ₂ Ring resonance element inductance forming part 4 ₁ and 4 ₂ Ring resonance element capacitance forming part 5 ₁ and 5 ₂ Solid dielectric 6 ₁ and 6 ₂ Movable electrode plate 7 ₁ and 7 ₂ Drive screw 8 ₁ and 8 ₂ Lock nut 9 ₁ and 9 ₂ Input / output coupling line 10 Holes 11 ₁ and 11 ₂ Coaxial plug HYB ₁ and HYB ₂ Hybrid coupling circuit NF ₁ and NF ₂ The notch filter of the present invention R _1L and R _2L Configuration of notch filter of the present invention Resonator R _1H and R _2H Configuration of notch filter of the present invention Resonator T _V and T _A Input terminal T _VA Output terminal T _ISL isolation terminal 12 Outer conductor 13 Half-coaxial resonance Element 14 Input / output coupling loop 15 Coaxial line for coupling to external circuit 16 Stub 17 Waveguide wall

Claims (4)

[Claims] [Claim 1] Two shield cases formed by dividing a common shield case by a partition wall made of a conductor, and a metal plate having one end fixed to each lower wall of the two shield cases divided and formed. A ring resonant element comprising an inductance forming part formed by bending in a substantially U shape and the other end of each of the inductance forming parts and a capacitance forming part between the other end and the lower wall of the shield case facing the other end, and the partition wall. through the, the Ru and a common input-output coupling line is decorated in two shield case which is the divided form
Both shields are one of the two shield cases formed separately.
One resonance consisting of a ring resonant element inside the case
The resonance frequency of the resonator is made relatively low, and the inductor of the ring resonator element in this one resonator is
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the lower wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in this one resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in this one resonator
Is the electrical length of the resonance wavelength of one of the resonators
/ 2 or less, the characteristic impedance of the external circuit
The other shield of the two shield cases that are divided and formed compared to the characteristic impedance of
The other resonance, which consists of a ring resonant element housed in the case
The resonance frequency of the resonator is made relatively high, and the inductor of the ring resonant element in the other resonator is formed.
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the bottom wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in the other resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in the other resonator
Is the electrical length, which is one of the resonance wavelengths of the other resonator.
/ 2 or less, the characteristic impedance of the external circuit
The notch filter is characterized by being formed higher than the characteristic impedance of . 2. A common shield case is separated by a conductor.
Two shield cases that are divided by walls and two lower shield walls of the two shield cases that are divided and formed.
An inn made by bending a metal plate with one end fixed in an inverted U shape
In addition to the inductance forming part and the inductance forming parts
An end and a lower wall of the shield case facing the other end
And a ring resonance element formed of a capacitance forming portion between the two, and the two shields that are divided and formed so as to penetrate the partition wall.
With a common input / output coupling line inside the case
Both shields are one of the two shield cases formed separately.
One resonance consisting of a ring resonant element inside the case
The resonance frequency of the resonator is made relatively low, and the inductor of the ring resonator element in this one resonator is
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the lower wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in this one resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in this one resonator
Is the electrical length of the resonance wavelength of one of the resonators
/ 2 or less, the characteristic impedance of the external circuit
The other shield of the two shield cases that are divided and formed compared to the characteristic impedance of
The other resonance, which consists of a ring resonant element housed in the case
The resonance frequency of the resonator is made relatively high, and the inductor of the ring resonant element in the other resonator is formed.
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the bottom wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in the other resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in the other resonator
Is the electrical length, which is one of the resonance wavelengths of the other resonator.
/ 2 or less, the characteristic impedance of the external circuit
Characterized by being formed higher than the characteristic impedance of
Notch filter. 3. A first notch filter is inserted and connected between one distribution output terminal of the first 90 ° hybrid coupling circuit and one distribution output terminal of the second 90 ° hybrid coupling circuit, A second notch filter is inserted and connected between the other distribution output terminal of the first 90 ° hybrid coupling circuit and the other distribution output terminal of the second 90 ° hybrid coupling circuit, and the first and second The two notch filters of the above notch filter are formed by dividing the inside of the common shield case by partition walls made of conductors, and a metal plate having one end fixed to each lower wall of the two shield cases formed by the division. Inductance forming portion formed by bending in a substantially U-shape, the other end of each inductance forming portion, and capacitance formation between the other end and the lower wall of the shield case facing the other end. A ring resonator consisting of parts, through said partition wall and Ru and a common input-output coupling line is decorated in two shield case which is the divided form
Both shields are one of the two shield cases formed separately.
One resonance consisting of a ring resonant element inside the case
The resonance frequency of the resonator is made relatively low, and the inductor of the ring resonator element in this one resonator is
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the lower wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in this one resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in this one resonator
Is the electrical length of the resonance wavelength of one of the resonators
/ 2 or less, the characteristic impedance of the external circuit
The other shield of the two shield cases that are divided and formed compared to the characteristic impedance of
The other resonance, which consists of a ring resonant element housed in the case
The resonance frequency of the resonator is made relatively high, and the inductor of the ring resonant element in the other resonator is formed.
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the bottom wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in the other resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in the other resonator
Is the electrical length, which is one of the resonance wavelengths of the other resonator.
/ 2 or less, the characteristic impedance of the external circuit
A notch diplexer characterized by being formed with a notch filter formed to be higher than the characteristic impedance of . 4. One of the first 90 ° hybrid coupling circuits.
Square distribution output terminal of the second 90 ° hybrid coupling circuit
1st notch filter between one of the distribution output terminals
Insert and connect the first 90 ° hybrid coupling circuit
The other distributed output terminal and the second 90 ° hybrid connection
The second notch filter is connected to the other distribution output terminal of the combined circuit.
Connector is inserted and connected, and the first and second notches
The filter is divided by a bulkhead made of a conductor in a common shield case.
Two shield cases that are formed by splitting , and two shield cases that are formed separately from each other on each lower wall.
An inn made by bending a metal plate with one end fixed in an inverted U shape
In addition to the inductance forming part and the inductance forming parts
An end and a lower wall of the shield case facing the other end
And a ring resonance element formed of a capacitance forming portion between the two, and the two shields that are divided and formed so as to penetrate the partition wall.
With a common input / output coupling line inside the case
Both shields are one of the two shield cases formed separately.
One resonance consisting of a ring resonant element inside the case
The resonance frequency of the resonator is made relatively low, and the inductor of the ring resonator element in this one resonator is
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with both edges of the rising part and both edges of the falling part
In the space surrounded by the edge, the shield case
Center axis perpendicular to the lower wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in this one resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in this one resonator
Is the electrical length of the resonance wavelength of one of the resonators
/ 2 or less, the characteristic impedance of the external circuit
The other shield of the two shield cases that are divided and formed compared to the characteristic impedance of
The other resonance, which consists of a ring resonant element housed in the case
The resonance frequency of the resonator is made relatively high, and the inductor of the ring resonant element in the other resonator is formed.
Of the chest forming part, it is orthogonal to the lower wall of the shield case
4 with a double edge of both the edge and the falling edge portion of the rising portion of the
In the space surrounded by the edge, the shield case
Center axis perpendicular to the bottom wall of the
In the common input / output coupling line part, it is orthogonal to the longitudinal direction.
And the inductor of the ring resonant element in the other resonator
The central axis in the space surrounded by the
Of the common input / output coupling line section in one resonator
The center point of the direction is included in almost the same plane, and the common input / output coupling line portion in the other resonator
Is the electrical length, which is one of the resonance wavelengths of the other resonator.
/ 2 or less, the characteristic impedance of the external circuit
Notch fill formed higher than the characteristic impedance of
Notch diplexer characterized by being formed of