JP3259098B2 - Linear polarized antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linearly polarized antenna device.

[0002]

2. Description of the Related Art Conventionally, as this type of linearly polarized antenna device, there has been a parabolic antenna device having a parabolic conductor.

[0003]

However, in the parabolic linearly polarized antenna device, the primary radiator protrudes forward from a parabolic conductor having a parabolic reflecting mirror surface. There was a limit.

On the other hand, there is a circularly polarized antenna device in which a transmission space is formed between a pair of metal plates, and this can be used as a linearly polarized receiving antenna device.

However, in this case, since the linearly polarized wave is received by the circularly polarized antenna device, the received power is reduced to 50% or less, and it is disadvantageous to divert it to receive linearly polarized wave.

For this reason, there is a demand for the development of a thin and compact dedicated linearly polarized antenna device which is optimally used for transmitting and receiving linearly polarized waves.

An object of the present invention is to provide a thin and small dedicated linearly polarized antenna device.

[0008]

In order to achieve the above object, a linearly polarized antenna device according to the present invention comprises a linearly polarized antenna having at least a transmission waveguide, a power input / output section, and a linearly polarized antenna element. A wave antenna device, wherein the transmission waveguide includes a pair of first and second metal plates arranged to face each other, and an outer peripheral wall that closes between outer peripheral edges of the metal plates, It has a transmission space formed by a pair of metal plates and an outer peripheral wall, the power input / output unit has a function of supplying power to the transmission space at the time of transmission, and a power at the transmission space at the time of reception. The linearly polarized antenna element transmits and receives linearly polarized power, and is coaxially supported via a dielectric in a small hole provided in the first metal plate. A coupling part, and an integral part of the coaxial coupling part in the transmission space. Coaxial coupling terminal that is input, linearly polarized antenna apparatus which is characterized in that those comprising a power radiating portion provided projecting forwardly from said integrated with the coaxial coupling portion the first metal plate.

[0009] The power output section, the inner conductor an outer conductor of the coaxial feed line is coupled to the second metal plate is the second
This is configured as a coaxial power supply structure inserted into the transmission space through a through hole provided in the metal plate. In addition,
The force input / output unit is provided on the back surface of the second metal plate via a dielectric.
Microphone having a microstrip line laid down
The terminal provided at the end of the strip line is the second gold
Inserted into the transmission space through a through hole provided in the metal plate
It is configured as a microstrip feed structure.
You. The power input / output unit is provided on a back surface of the second metal plate.
Microstrip line laid through a dielectric
A terminal provided at the tip of the microstrip line
Is formed in the transmission space through a through hole provided in the second metal plate.
Insert the microstrip line into the dielectric
And a triplate feed structure covered with a metal plate through
It is configured as follows.

[0010] inserted into the coaxial inner conductor of the coaxial feeder which forms the feed structure, the microstrip feed structures and the transmission space of the bets <br/> terminal connected to the microstrip line of the replated feed structure Part is reversed
Conical, cylindrical or polygonal, spherical, curled
Either of the above shapes or attach a dielectric
Only, or by thick, it is obtained by the configuration obtaining broadband characteristics and impedance matching.

[0011] Coaxial coupling terminal of said linearly polarized antenna elements, conical, cylindrical or polygonal shape, spherical shape, mosquitoes
Or a dielectric material.
Mounting, or by thick, it is obtained by the configuration obtaining broadband characteristics and impedance matching.

When a plurality of linearly polarized antenna elements are mounted on the first metal plate, the linearly polarized antenna element disposed on the outermost edge side of the plurality of linearly polarized antenna element groups is reflected by an outer peripheral wall. The transmitted radio waves are disposed on a transmission path leading to a power input / output unit.

[0013]

According to the present invention, a transmission space is formed between a pair of first and second metal plates and an outer peripheral wall, and the transmission space and a linearly polarized antenna element are combined to form a linearly polarized antenna. A linearly polarized antenna device suitable for transmission and reception is constructed, and the antenna gain is improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a perspective view showing an embodiment in which a monopole antenna element is used as a linearly polarized antenna element in the present invention, FIG. 1B is a plan view thereof, and FIG.
FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1B, and FIG. 2B is an enlarged view of a portion X in FIG. 2A.

The linearly polarized antenna device according to this embodiment is
The one having the transmission waveguide 1 and the linearly polarized antenna element shown in FIGS. 1A, 1B, 2A, and 2B, and the power input / output unit 6 shown in FIG. 2A. It is.

As shown in FIGS. 1 (a) and 2 (a), the transmission waveguide 1 includes a pair of first and second metal plates 1a and 1b arranged facing each other, and a metal plate 1a. , 1b in the form of a ring.

The first and second metal plates 1a and 1b are shown in FIG.
As shown in (a), they are arranged facing each other with a clearance dimension S smaller than the wavelength of the transmission / reception radio wave, and are provided between the pair of first and second metal plates 1a, 1b and the outer peripheral wall 1c. A transmission space 1d is formed.

The metal plates 1a and 1b are shown in FIG.
In the case of (b), the shape is a dodecagon, but the shape is not limited to this, and it may be a polygonal shape other than this, or a circular shape. Alternatively, it may be of any shape. As shown in FIG. 2A, a radio wave absorber 3 is provided on the inner diameter side of the ring-shaped outer peripheral wall 1c as necessary.
May be provided.

The first metal plate 1a has a structure shown in FIG.
As shown in (b), one or more small holes 4, 4...
Is provided with a through hole 1f in the center. In addition, the through hole 1f may be provided at a position shifted from the center of the second metal plate 1b as necessary.

FIGS. 1 (a) and 1 (b), FIGS. 2 (a) and 2 (b)
The linearly polarized antenna element shown in (1) transmits and receives linearly polarized power. 1 (a), (b), FIG. 2 (a),
The monopole antenna element 5 is used as the linearly polarized antenna element shown in FIG. The monopole antenna element 5 shown in FIGS. 2A and 2B has a coaxial coupling section 5b, a coaxial coupling terminal 5a, and a power radiating section 5c. Here, as shown in FIG. 2B, the coaxial coupling portion 5b has a length L ₁ between the front surface 1aa and the back surface 1ab of the first metal plate 1a.
And is defined as a portion existing in the small hole 4.
Further, the coaxial coupling terminal 5a is defined as a portion inserted into the transmission space 1d. The power radiating portion 5c is defined as a portion from the surface 1aa of the first metal plate 1a to the tip 5cc.

Coaxial coupling part 5 of monopole antenna element 5
As shown in FIGS. 2 (a) and 2 (b), b is linearly formed and is supported by the dielectric 1e in the small hole 4 of the first metal plate 1a. As shown in FIGS. 2 (a) and 2 (b), the coaxial coupling terminal 5a is integrated with the coaxial coupling section 5b to form the transmission space 1d.
Is inserted inside. The power radiating unit 5c is configured as shown in FIG.
As shown in (b), the coaxial coupling portion 5b
And is provided so as to protrude forward from the surface 1aa of the first metal plate 1a.

The coaxial coupling terminal 5a of the monopole antenna element 5 is formed in a conical shape. Here, the coaxial coupling terminal 5a is formed in a conical shape so as to match impedance and obtain broadband characteristics.

When a plurality of monopole antenna elements 5, 5... Are mounted on the first metal plate 1a as shown in FIGS. 1 (a) and 1 (b), the outermost edge located on the two-dot chain line R Are arranged on a transmission line 2 indicated by a dashed line toward the power input / output unit 6 in which radio waves reflected by the outer peripheral wall 1c are described. The same applies to a case where a plurality of linearly polarized antenna elements of various types described later are arranged.

When the outer shape of the metal plate 1a is polygonal, the linearly polarized antenna elements 5, 5 arranged on the outermost edge side
.. Are arranged on a vertical bisector of the side 1ac of the polygon and on a line toward the power input / output unit 6, as shown in FIGS. 1 (a) and 1 (b).

The power input / output unit 6 is provided on the side of the second metal plate 1b as shown in FIG. The power input / output unit 6 shown in FIG. 2A has a coaxial power supply structure. That is, the outer conductor 7a of the coaxial feeder 7 is connected to the second metal plate 1b.
And the internal conductor 7b is inserted into the transmission space 1d through the through hole 1f of the metal plate 1b.

The portion 7bb of the inner conductor 7b inserted into the transmission space 1d is formed in an inverted conical shape. Here, the inner conductor 7b is formed in an inverted conical shape so as to match impedance and obtain broadband characteristics.

The power input / output unit 6 has a function of supplying power to the transmission space 1d during transmission and a function of collecting power in the transmission space 1d during reception.

FIGS. 1 (a) and 1 (b), FIGS. 2 (a) and 2 (b)
In the antenna device shown in FIG. 1, the radio wave from the power input / output unit 6 transmits a plurality of monopole antenna elements 5, 5,.
Through the transmission space 1d. During reception, radio waves from the plurality of monopole antenna elements 5, 5,... Are collected in the power input / output unit 6 through the transmission space 1d. This is also true for various linearly polarized antenna elements described below.

As shown in FIG. 2 (b), the combination portion (X portion in FIG. 2 (a)) composed of the coaxial coupling portion 5b, the dielectric 1e and the metal plate 1a has a coaxial structure.
By setting the length L ₁ corresponding to the thickness of the metal plate 1a to length, it is possible to measure the impedance matching.

As the linearly polarized antenna element, FIG.
The present invention is not limited to the monopole antenna element 5 shown in (a), (b) and FIGS. 2 (a), (b). The linearly polarized antenna element shown in FIG. 3A shows a case where a bent antenna element 8 is used. The bent antenna element 8 shown in FIG. 3A has a coaxial coupling portion 8b and a coaxial coupling terminal 8a.
And a power radiating portion 8c. The power radiating portion 8c is formed by being bent laterally from the middle thereof.

The linearly polarized antenna element shown in FIG. 3B shows a case where an inverted F-type antenna element 9 is used. The inverted F-type antenna element 9 shown in FIG. 3B has a coaxial coupling portion 9b, a coaxial coupling terminal 9a, and a power radiating portion 9c, and the power radiating portion 9c is formed by being bent in the lateral direction from the middle thereof. And an impedance matching section 9d.

The linearly polarized antenna element shown in FIG. 3C shows a case where a zigzag antenna element 10 is used. Zigzag type antenna element 1 shown in FIG.
Numeral 0 has a coaxial coupling portion 10b, a coaxial coupling terminal 10a, and a power radiating portion 10c, and the power radiating portion 10c is formed by being bent in a zigzag shape.

FIGS. 3D and 3E show a patch antenna element as a linearly polarized antenna element.
FIG. 3D is a plan view, and FIG.
It is B 'line sectional drawing. The patch-type antenna element 11 shown in FIGS. 3D and 3E has a coaxial coupling section 11b, a coaxial coupling terminal 11a, and a power radiating section 11c. The power radiating portion 11c includes a straight portion 11cc and a patch portion 11cd. In this figure, the straight portion 11cc is attached to the center of the patch portion 11cd. 11cc straight section according to purpose
May be attached to a position shifted from the center of the patch portion 11cd. Further, in this figure, the patch portion 11cd is circular, but may be square or rectangular.

It should be noted that the linearly polarized antenna element is not limited to the illustrated one, but can be similarly applied to other linearly polarized antenna elements.

The power input / output unit 6 shown in FIG. 4 has a microstrip power supply structure. In the microstrip power supply structure, a microstrip line 13 is laid on the back surface of the second metal plate 1b via a dielectric 12. The tip of the microstrip line 13 and the terminal 14 in the transmission space 1d are connected by a linear element 14a inserted into the through hole 1f of the second metal plate 1b. Power is supplied between the second metal plate 1b and the microstrip line 13.

The power input / output unit 6 shown in FIG. 5 has a triplate power supply structure. Fig. 4
The metal plate 16 is lined with a microstrip line 13 shown in FIG. 1 via a dielectric 15, and the microstrip line 13 is provided between the dielectrics 12 and 15. Power is supplied between the metal plate 1 b and the metal plate 16 and the microstrip line 13.

The pair of metal plates 1a and 1b arranged facing each other includes a convex conical shape (FIG. 6 (a)) in which the vicinity of the lower metal plate 1b where the power input / output unit 6 is provided projects downward. The vicinity of the metal plate 1b where the power input / output unit 6 is provided is a concave conical shape protruding upward (FIG. 6B), and the part of the upper metal plate 1a facing the power input / output unit 6 of the lower metal plate 1b is FIG. 6 (c) shows a concave conical shape depressed downward.
The conical portions shown in (a), (b), and (c) can be replaced with curved conical portions, and the flat and curved conical portions can be appropriately combined and used. FIG. 6D shows a case where the lower metal plate 1b of FIG. 6B is formed into a curved surface 1h based on this concept.

As shown in FIGS. 7 (a), 7 (b) and 7 (d), a horizontal portion 1j is provided at a portion of the conical portion of the lower metal plate 1b where the power input / output portion 6 is provided. 7 (c)
Of the upper metal plate 1a as shown in FIG.
May be provided with the horizontal portion 1j.

The coaxial coupling terminals 5a (including 8a, 9a, 10a, 11a, the same applies hereinafter) of the above-mentioned various linearly polarized antenna elements have a conical shape, but have a cylindrical (or polygonal) shape shown in FIG. Shape) 5a, spherical shape 5 shown in FIG.
a, the curl shape 5a shown in FIG.

Further, as shown in FIG. 8D, a dielectric 17 may be attached to the coaxial coupling terminal 5a to obtain a wide band characteristic. Also, as shown in FIG.
b and the coaxial coupling terminal 5a are made thicker so that the coaxial coupling terminal 5a
May be inserted into the transmission space to obtain broadband characteristics. Other shapes may be used.

The shape of the above-mentioned coaxial coupling terminal is such that the portion of the inner conductor 7b shown in FIG. 2A inserted into the transmission space 1bb or the microstrip line 13 shown in FIGS. The present invention may be applied to the terminal 14 connected via the element 14a.

[0043]

As described above, according to the present invention, a transmission space is formed between a pair of metal plates, and the transmission space is combined with a linearly polarized antenna element to transmit and receive linearly polarized waves. The most suitable antenna device can be provided.

The distance between the pair of metal plates can be made narrower than the wavelength of the transmission / reception radio wave, and the thickness and the size can be reduced.

Further, by arranging a plurality of linearly polarized antenna elements, the antenna gain can be improved.

Furthermore, the coaxial coupling terminal of the antenna element inserted into the transmission space and the power supply structure of the power input / output unit are devised, so that wideband characteristics can be easily realized.

Further, in the case of the microstrip power supply structure and the triplate power supply structure, electronic devices such as a converter, a phase shifter, and a resistor can be integrated, and the antenna device can be downsized.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment in which a monopole antenna element is used as a linearly polarized antenna element in the present invention, and FIG. 1B is a plan view thereof.

2A is a cross-sectional view taken along line AA ′ of FIG.
FIG. 2B is an enlarged view of a part X in FIG.

FIG. 3A is a diagram showing a bent antenna element;
(B) is a diagram illustrating an inverted-F antenna element, (c) is a diagram illustrating a zigzag antenna element, (d) is a diagram illustrating a patch antenna element, and (e) is a BB ′ line of (d). It is sectional drawing.

FIG. 4 is a sectional view showing a microstrip power supply structure.

FIG. 5 is a sectional view showing a triplate power supply structure.

FIG. 6 is a view showing a structure of a pair of metal plates.

FIG. 7 is a view showing a structure of a pair of metal plates having a horizontal portion.

FIG. 8 is a diagram showing a shape of a coaxial coupling terminal for obtaining a broadband characteristic.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission waveguide 1a 1st metal plate 1b 2nd metal plate 1c Outer wall 1d Transmission space 1e Dielectric for supporting a coaxial coupling part 1f Through hole 2 Reflected radio wave transmission path 3 Radio wave absorber 4 Small hole 5 Monopole antenna Element 5a Coaxial coupling terminal of monopole antenna element 5b Coaxial coupling section of monopole antenna element 5c Power radiating section of monopole antenna element 6 Power input / output section 7 Coaxial feed line 7a Outer conductor of coaxial feed line 7b Inside coaxial feed line Conductor 8 Folded antenna element 8a Coaxial coupling terminal of folded antenna element 8b Coaxial coupling part of folded antenna element 8c Power radiating part of folded antenna element 9 Inverted F antenna element 9a Coaxial coupling terminal of inverted F antenna element 9b Coaxial coupling part of inverted-F antenna element 9c Power radiating part of inverted-F antenna element 10 Zigzag antenna element 10a Di Coaxial coupling terminal of zigzag antenna element 10b Coaxial coupling section of zigzag antenna element 10c Power radiating section of zigzag antenna element 11 Patch antenna element 11a Coaxial coupling terminal of patch antenna element 11b Coaxial coupling section of patch antenna element 11c Power radiating portion of patch antenna element 12, 15 Microstrip line supporting dielectric 13 Microstrip line 14 Terminal 14a Linear element 16 Metal plate 17 Coaxial coupling terminal dielectric

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01Q 21/00-21/30 H01Q 13/08

Claims (7)

(57) [Claims] 1. A linearly polarized antenna device having at least a transmission waveguide, a power input / output unit, and a linearly polarized antenna element, wherein the transmission waveguides are arranged so as to face each other. 1
And a pair of second metal plates, and an outer peripheral wall closing an outer peripheral edge of the metal plate, and having a transmission space formed by the pair of metal plates and the outer peripheral wall. The output unit has a function of supplying power in the transmission space at the time of transmission, and a function of collecting power in the transmission space at the time of reception.The linearly polarized antenna element has a linearly polarized power. A coaxial coupling portion supported via a dielectric in a small hole provided in the first metal plate, and a coaxial coupling terminal integrated with the coaxial coupling portion and inserted into the transmission space. And a power radiating portion formed integrally with the coaxial coupling portion and protruding forward from the first metal plate. Wherein said power output section, the inner conductor is coupled outer conductor to the second metal plate of the coaxial feed line is inserted into the transmission space through hole provided on the metal plate of the second linearly polarized antenna device according to claim 1, characterized in that configured as a coaxial feed structure. 3. The power input / output unit includes the second metal plate.
Microstrip laid on the back of the body via a dielectric
Line at the end of the microstrip line
Through the through hole provided in the second metal plate.
Microstrip feed structure inserted in the transmission space
2. The method according to claim 1, wherein
On-board linearly polarized antenna device. 4. The power input / output unit includes the second metal plate.
Microstrip laid on the back of the body via a dielectric
Line at the end of the microstrip line
Through the through hole provided in the second metal plate.
And inserted into the transfer space,
Triplate power feeding covered with metal plate via dielectric
Claims characterized by being structured as a structure
Item 2. A linearly polarized antenna device according to item 1. 5. The inner conductor of the coaxial feeder which forms the coaxial feed structure, the injected part in the transmission space of the microstrip feed structure and the terminal connected to the microstrip line of the triplate feed structure, Inverted circle
Cone, cylinder or polygon, sphere, curl
Configure as any shape, or attach a dielectric,
Or by thick, linearly polarized antenna device according to claim 2, 3 or 4, characterized in that is obtained by the configuration obtaining broadband characteristics and impedance matching. 6. The coaxial coupling terminal of the linearly polarized antenna element has a conical shape, a cylindrical shape or a polygonal shape, a spherical shape,
Or a dielectric material.
2. The linearly polarized antenna device according to claim 1, wherein the configuration is such that the impedance is matched to obtain broadband characteristics by attaching or thickening . 7. When a plurality of linearly polarized antenna elements are mounted on the first metal plate, the linearly polarized antenna element disposed on the outermost edge side of the plurality of linearly polarized antenna element groups is:
The linearly polarized antenna device according to claim 1, wherein the radio wave reflected by the outer peripheral wall is disposed on a transmission path toward the power input / output unit.