JPS5811122B2 - solid state oscillator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solid-state oscillation device using a solid-state oscillation element,
The object of this invention is to lower the external Q value of a solid-state oscillator and at the same time make it possible to efficiently extract the generated output.

There are many demands for lowering the external Q value of microwave solid-state oscillators and amplifiers, such as injection-locked amplifiers and self-injection-locked oscillators.

Designing a low external Q value largely depends on the mounting structure of the solid-state oscillation element and the configuration of the external additional circuit.

The synchronous pull-in width of an injection-locked amplifier is inversely proportional to the external Q value of the oscillator used in the injection-locked amplifier, so in order to widen the synchronous pull-in width and widen the amplifier bandwidth, the external Q value of the oscillator must be lowered. .

Similarly, in a self-injection locked oscillator that stabilizes the oscillation frequency by coupling a temperature-stable high-Q resonator to an oscillator whose oscillation frequency is unstable with respect to temperature, the external It is necessary to keep the Q value sufficiently small compared to the no-load Q value of the high-Q resonator.

Several methods have been proposed for mounting solid-state oscillation elements, and one of them is a solid-state oscillator having a structure in which a solid-state oscillation element is covered with a disk-shaped conductor, as shown in FIG.

In FIG. 1, 1 is a solid-state oscillation element, and the solid-state oscillation element 1
is mounted in a rectangular waveguide 3 by covering it with a disc-shaped conductor 2.

In this structure, the oscillation frequency is mainly determined by the diameter D of the disc-shaped conductor 2.
', and the movable short circuit 4 is used for fine adjustment of the oscillation frequency.

5 shows the state of the electric field near the disc-shaped conductor 2.

However, in the conventional solid-state oscillator device with the structure shown in FIG.
), so the exchange from radial mode to waveguide mode is not smooth.

Therefore, the solid-state oscillator impedance is low (several ohms to several tens of ohms
Since the conversion from Ω) to waveguide impedance cannot be performed smoothly, the external Q value of the solid-state oscillator becomes relatively high, and the oscillation output cannot be extracted efficiently.

An object of the present invention is to improve the above-mentioned conventional drawbacks by adding a circuit with a simple configuration.

Several embodiments of the present invention will be described below based on the drawings, and all the same parts as in FIG. 1 will be described with the same numbers as in FIG. 1.

FIGS. 2a and 2b show a first embodiment of the present invention, in which a solid-state oscillation element 1 is covered with a disc-shaped conductor 2 and mounted within a rectangular waveguide 3. FIG.

4 is a movable short circuit.

A capacitive aperture 6 is provided at a position close to the disc-shaped conductor 2.

This capacitive aperture 6 enables smooth conversion of the electromagnetic field mode from the radial mode of the disc-shaped conductor 2 to the waveguide mode, as shown by the electric field 7 in the figure.

That is, when comparing the conventional example shown in FIG. 1 and the embodiment of the present invention shown in FIG. 2 in terms of the electric field 5 in FIG. 1 and the electric field 7 in FIG. It can be seen that the electric field 7 in Figure 2 changes more smoothly from the disc-shaped conductor 2 to the waveguide 3.

That is, by adding such a capacitive aperture 6,
The low impedance of the solid-state oscillation device 1 can be smoothly converted to the high impedance of the waveguide 3.

Therefore, the oscillation output can be efficiently taken out to the load side of the waveguide 3, and a solid-state oscillator device with a low external Q value can be obtained.

Here, if the capacitive diaphragm 6 is located close to the edge of the disc-shaped conductor 2 within a distance of λg/8 (λg is the wavelength within the tube), the effect obtained will be particularly large.

Moreover, the same effect can be obtained not only in the position of the capacitive aperture 6 in the direction away from the disc-shaped conductor 2 but also in the direction overlapping with the disc-shaped conductor 2.

FIG. 3 shows a second embodiment of the present invention, and is a band-stop type stabilized oscillator showing an application example of the second embodiment.

In FIG. 3, a high-Q cavity resonator 9 whose resonant frequency is stable against temperature changes is connected to the waveguide 3 through a coupling hole 10 at a position approximately λg/2 (λg is the tube wavelength) from the solid-state oscillator 1. The rest of the configuration is exactly the same as the configuration shown in FIG. is pulled into fc, and the solid-state oscillator starts to oscillate at almost the same frequency as fc.

Therefore, the oscillation frequency of the stabilized oscillator whose oscillation frequency fluctuates with temperature changes can be stabilized by the stabilized high-Q cavity resonator 9.

Although a high-Q cavity resonator is used in the above embodiment, it goes without saying that a dielectric resonator whose resonant frequency is stable against temperature changes can also be used.

FIG. 4 shows data on the external Q value and oscillation output of the oscillator when the height h of the capacitive aperture 6 is varied in the embodiment shown in FIG.

H is the height of the waveguide 3. From this data, it can be seen that by appropriately selecting the height h of the capacitive aperture 6, a solid-state oscillator device with a low external Q value of the oscillator and high oscillation efficiency can be obtained, and at the same time, the external Q value can be easily adjusted.

FIG. 5 shows a third embodiment of the present invention, in which only the movable short circuit 4 in FIG. 2 is replaced with a non-reflection terminator 8.

Low impedance of solid-state oscillator 1 and non-reflection terminator 8
The high impedance of the waveguide on the side means that there is no capacitive aperture, so conversion is not performed smoothly.

Therefore, the oscillation output to the non-reflection terminator 8 side can be extremely reduced, the oscillation power consumed by the non-reflection terminator 8 is small, and most of the sporadic oscillation output can be efficiently taken out to the load side.

Furthermore, since the movable short circuit 4 is replaced with the non-reflection terminator 8, unnecessary resonance characteristics caused by the movable short circuit 4 are removed, so that the oscillation characteristics of the solid-state oscillator are stabilized.

FIG. 6 shows a fourth embodiment of the present invention, in which capacitive apertures 6 and 6' are provided close to both sides of a disc-shaped conductor 20.

A non-reflection terminator 8 is provided on the waveguide output side of the capacitive aperture 6', and approximately λg/2 (λg is A high-Q cavity resonator 9 whose resonant frequency is stable against temperature changes is coupled to the waveguide 3 through a coupling hole 10 at a position at a wavelength within the tube.

The oscillation frequency fo of the solid-state oscillator approaches the resonance frequency fc of the stabilized high-Q cavity resonator 9 (and the oscillation frequency f of the solid-state oscillator).

is pulled into fc, and the solid-state oscillator starts to oscillate at almost the same frequency as fc.

Therefore, the oscillation frequency of the stabilized oscillator whose oscillation frequency fluctuates with temperature changes can be stabilized by the stabilized high-Q cavity resonator 9.

The magnitude of the coupling between the solid-state oscillator and the stabilized high-Q cavity resonator 9 is determined not only by the height hl of the capacitive aperture 6' (it can also be adjusted by changing the distance 11), The coupling with the load side can be adjusted by changing the height h2 and distance 12 of the capacitive diaphragm 6.

FIG. 7 shows a fifth embodiment of the present invention.

The solid-state oscillation element 1, the disc-shaped conductor 2, and the movable short circuit 4 are completely the same as those in the embodiment shown in FIG.

Reference numeral 11 denotes a capacitive aperture which is sandwiched between a waveguide flange 12 having a screw hole 14 and a rectangular waveguide 13 having a screw hole 15, and is configured such that the whole is fixed with a screw 16. The aperture 11 can be shifted in the vertical direction, that is, in the direction perpendicular to the H-plane of the rectangular waveguide 13.

8a and 8b are side views of the capacitive diaphragm 11 and the waveguide flange 12 in the embodiment of FIG. 7, respectively.

The four corners of the capacitive restrictor 11 are removed so as not to obstruct the screw 16.

With the configuration shown in FIG. 7, there is no need to replace the capacitive diaphragm 11 each time the height h of the capacitive diaphragm 11 is adjusted, and the height h can be changed to any desired height using just one capacitive diaphragm 11, so the solid-state oscillator The external Q value can be adjusted very easily.

The present invention can be implemented as described above, and by adding a capacitive diaphragm with a simple configuration near the disc-shaped conductor that covers the solid-state oscillation element, the low element impedance of the solid-state oscillation element can be increased. The impedance can be smoothly converted to the waveguide impedance, and the external Q value of the solid-state oscillator can be lowered, and at the same time, the oscillation output can be efficiently extracted to the load.

Therefore, it is effective for injection-locked amplifiers, self-injection-locked oscillators, etc.

Moreover, since the capacitive diaphragm is mounted near the disc-shaped conductor, the external dimensions of the entire solid-state oscillator can be reduced.

Furthermore, by changing the height and position of the capacitive aperture, the coupling between the solid-state oscillator and the load can be easily adjusted.

Furthermore, a solid-state oscillator with a bidirectional load is constructed by adding capacitive apertures to both sides of the disk-shaped conductor that covers the solid-state oscillator, and the magnitude of the coupling of the solid-state oscillator to the load in both directions is determined by each capacitive aperture. It has the advantage of being able to be adjusted by adjusting the height and position.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a solid-state oscillator device having a structure in which a conventional disc-shaped conductor is covered with a solid-state oscillation element, and FIG. 2 shows a first embodiment of the present invention, and FIG. b is a front sectional view,
FIG. 3 is a sectional view showing a second embodiment of the present invention, FIG. 4 is a characteristic diagram of the second embodiment, and FIGS. 5 to 7 are sectional views showing different embodiments of the present invention. 8a and 8b show side views of the capacitive diaphragm and waveguide flange, respectively, in the embodiment of FIG. 1. In the figure, 1...Solid oscillation element, 2...Disc-shaped conductor, 3...One-sided waveguide, 4...
Movable short circuit, 5...Electric field, 6,6'...
Capacitive aperture, 7... Electric field, 8... Non-reflection terminator,
9...Cavity resonator, 10...Coupling hole,
11... Capacitive aperture, 12... Waveguide flange, 13... Rectangular waveguide, 14, 15...
・Screw hole, 16...screw.

Claims (1)

[Scope of Claims] 1. In a solid-state oscillation device in which a solid-state oscillation element is covered with a flat conductor and mounted in a waveguide, a capacitance is provided near the flat conductor on one or both sides of the waveguide opening of the solid-state oscillation device. A solid-state oscillator device characterized by having a magnetic aperture. 2. The solid-state oscillator device according to claim 1, wherein the waveguide is a rectangular waveguide, and the capacitive aperture is movable in a direction perpendicular to the H-plane of the rectangular waveguide.