JP2002330028A - Gunn oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Gunn oscillator that easily transfers heat being generated by a Gunn diode to upper and lower conductor plates, can prevent damage in the Gunn diode due to the heat, and can prevent oscillation output from leaking to the back portion of the Gunn diode mount. SOLUTION: The Gunn oscillator uses a radiationless dielectric line that retains a dielectric strip between conductor plates separated in parallel as an output line, and uses the Gunn diode as an oscillation element. Also, the Gunn oscillator has at least two projections where the axial length in the Gunn diode at the contact section between the Gunn diode mount and the conductor plate is an odd double of the 1/4 wavelength in the free speed of an oscillation frequency, and a recess where the axial length in the Gunn diode being sandwiched by the projections is an odd double of 1/4 wavelength in the free speed of the oscillation frequency on the contact surface between the Gunn diode mount for mounting the Gun diode on the side and the conductor plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NRD
The present invention relates to a gun oscillator that uses a guide and uses a gun diode as an oscillation element to generate a high-frequency signal.

[0002]

2. Description of the Related Art An NRD guide has a simple structure in which a dielectric strip is sandwiched between an upper conductor plate and a lower conductor plate which are separated in parallel with each other. It has the feature that there is no unnecessary radiation at the discontinuous part. The Gunn diode has a feature that it can generate a high-output millimeter-wave signal only by applying a bias voltage of about 5 V. A Gunn oscillator combining these two can be used in automobile collision prevention radars, wireless LAN terminals, etc. Used in.

[0003] Hereinafter, a gun oscillator using a conventional NRD guide will be described.

FIG. 6A is a perspective view showing the entire structure of a conventional gun oscillator, and FIG. 6B is a sectional view of a main part of a gun diode portion of the conventional gun oscillator. FIG.
Shows a Gunn oscillator in the case where the oscillation frequency such as the 10 GHz band or the 20 GHz band is relatively low, and the distance between the upper conductor plate and the lower conductor plate is larger than the diameter of the Gunn diode.

In FIG. 6, 1d is a conventional gun oscillator, 2d
Is a metal gun diode mount, 2a is a gun diode, 3a is a concave portion provided on the upper surface of the gun diode mount 2, and 3b is a concave portion provided on the lower surface of the gun diode mount 2. The length of the recesses 3a, 3b in the axial direction of the Gunn diode 2a is equal to a quarter wavelength in the free space of the oscillation frequency. 4a, 4b, 4c, and 4d are projections of the Gunn diode mount 2. Convex parts 4a, 4b, 4
The length of c and 4d in the axial direction of the Gunn diode 2a is equal to a quarter wavelength in free space of the oscillation frequency.
Reference numeral 5 denotes a cathode terminal 5 of the Gunn diode 2a. The gun diode 2 a is screwed into a screw hole provided on the side surface of the gun diode mount 2, and the cathode terminal 5 of the gun diode 2 a is in contact with the gun diode mount 2. Reference numeral 6 denotes a bias line formed on a dielectric substrate, and reference numeral 7 denotes an anode terminal of the Gunn diode 2a. The tip of the bias line 6 is connected to the anode terminal 7 of the Gunn diode 2a. The bias line 6 is provided with a low-pass filter formed by periodically changing the width of the conductor pattern in order to prevent the oscillation output from leaking to the bias line 6 side. Reference numeral 8 denotes a strip line formed on a dielectric substrate. The strip line 8 is arranged perpendicular to the Gunn diode mount 2 and on the central axis of the Gunn diode 2a. 9 is a dielectric strip, 10
Is a mode suppressor in which a metal foil is inserted into the center of the dielectric strip. The mode suppressor 10 has a function of preventing generation of an unnecessary mode in the transmission line converter of the strip line 8 and the dielectric strip 9. 11 is an upper conductor plate, 11a is a lower conductor plate, 12 is a terminal for applying a bias voltage to the Gunn diode 2a, and 12a is a terminal for grounding the Gunn diode 2a. Upper conductor plate 1
1. The lower conductor plate 11a also has a function as a radiator of the Gunn diode 2a.

The operation of the conventional gun oscillator configured as described above will be described below with reference to the drawings.

The bias voltage applied to the Gunn diode 2a is
The voltage is applied from the terminal 12 to the anode terminal 7 via the bias line 6. The Gunn diode 2 a generates a high-frequency signal when a bias voltage is applied, and its oscillation output is guided to a dielectric strip 9 via a strip line 8. As described above, the oscillation output from the Gunn diode 2a is finally extracted from the dielectric strip 9. Depending on the machining accuracy of the Gunn diode mount 2, a gap may be formed between the Gunn diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a. Since the unevenness is provided at a period of a quarter wavelength in the space, leakage of the oscillation output from the gap can be prevented.

Japanese Patent No. 2989391 discloses a "high-frequency signal generator" as a conventional gun oscillator using an NRD guide. Hereinafter, a conventional high-frequency signal generator will be described.

FIG. 7A is a diagram showing the entire structure of a conventional high-frequency signal generator, and FIG. 7B is a sectional view of a main part of a Gunn diode portion of the conventional high-frequency signal generator. FIG. 7 shows a high-frequency signal generator in the case where the oscillation frequency such as the 60 GHz band or the 77 GHz band is relatively high and the distance between the upper conductor plate and the lower conductor plate is smaller than the diameter of the Gunn diode.

In FIG. 7, reference numeral 20 denotes a conventional high-frequency signal generator, reference numeral 21 denotes a metal gun diode mount, and reference numeral 22 denotes a gun diode. The gun diode 22 is screwed into a screw hole on the side of the gun diode mount 21.
The cathode terminal 23 of the gun diode 22 is in contact with the gun diode mount 21. Reference numeral 24 denotes a bias line provided on the dielectric substrate and having a function of a low-pass filter. The tip of the bias line 24 is a gun diode 22
Is connected to the anode terminal 25. Reference numeral 26 denotes a strip line provided on a dielectric substrate. Strip line 2
6 is disposed perpendicular to the Gunn diode mount 21. 27 is a dielectric strip, 28 is a mode suppressor in which a metal foil is inserted into the center of the dielectric strip 27,
29 is an upper conductor plate; 29a is a lower conductor plate; 30 is a terminal for applying a bias voltage to the gun diode 22;
0a is a terminal for grounding the Gunn diode 2a, 3
Reference numerals 2 and 33 denote grooves provided on the upper conductor plate and the lower conductor plate, respectively, and into which the Gunn diode mount 21 is fitted. The upper conductor plate 29 and the lower conductor plate 29a also have a function as a radiator of the Gunn diode 22.

In the NRD guide, the upper conductor plate 2
9 and the lower conductor plate 29a are set at a half wavelength or less of the operating frequency to suppress unnecessary radiation. However, since the commercially available Gunn diode is enclosed in a package having a diameter of about 3 mm, the operating frequency band is Is higher, the upper conductor plate 29
And the distance between the lower conductor plate 29a and the gun diode 22 becomes smaller than the diameter of the gun diode 22, and the gun diode 22 and the gun diode mount 21 holding the gun diode 22 are removed.
It cannot be inserted between the upper conductor plate 29 and the lower conductor plate 29a. For example, in a 60 GHz band having a wavelength of 5 mm, the distance between the upper conductor plate and the lower conductor plate is 2.5 mm or less,
The commercially available Gunn diode 22 operating in the 0 GHz band has a diameter of 3 mm and cannot be inserted between the upper conductor plate 29 and the lower conductor plate 29a as it is. In order to solve this, in the high-frequency signal generator shown in FIG. 7, grooves 32 and 33 are provided in the upper conductor plate 29 and the lower conductor plate 129, and the Gunn diode mount 21 is fitted.

The operation of the high-frequency signal generator configured as described above will be described below with reference to the drawings. A bias voltage applied to the Gunn diode 22 is applied from a terminal 30 to an anode terminal 25 via a bias line 24. The Gunn diode 22 generates a high-frequency signal when a bias voltage is applied, and its oscillation output is guided to a dielectric strip 27 via a strip line 26. As described above, the oscillation output from the Gunn diode 22 is extracted from the dielectric strip 27.

As described above, conventionally, gun oscillators having different configurations have been selectively used depending on the oscillation frequency.

[0014]

However, the above-mentioned conventional technology has the following problems.

(1) In the conventional Gunn oscillator, the oscillation efficiency of the current Gunn diode is at most several percent, and a large amount of heat is generated from the Gunn diode during oscillation. However, the Gunn diode mount, the upper conductor plate and the lower conductor Since the contact area of the plate is small, heat conduction from the Gunn diode to the upper and lower conductor plates is not sufficient, and the Gunn diode has a problem of being damaged by heat generated by itself.

(2) In the conventional high-frequency signal generator, since there is no unevenness provided on the gun diode mount, a gap is generated between the gun diode mount and the upper conductor plate or the lower conductor plate due to a machining error, or When a gap is formed between the gun diode mount and the upper and lower conductor plates, the oscillation output leaks to the rear of the gun diode mount through the gap.

(3) If the Gunn diode mount of the conventional high frequency signal generator is provided with the same irregularities as the Gunn diode mount of the conventional Gunn oscillator, leakage of oscillation output to the rear of the Gunn diode mount can be suppressed. It seems that simply by providing irregularities on the upper and lower surfaces of the Gunn diode mount with a period of 1/4 wavelength in the free space of the oscillation frequency, when fitted into the grooves provided in the upper and lower conductor plates, There is a problem that the frequency at which the electromagnetic wave does not leak deviates from the oscillation frequency, so that it is impossible to prevent the oscillation output from leaking to the rear of the Gunn diode mount.

The present invention solves the above-mentioned conventional problems. The heat generated by the Gunn diode can be easily transmitted to the upper conductor plate and the lower conductor plate, and the Gun diode can be prevented from being damaged by the heat. It is an object of the present invention to provide a gun oscillator that can prevent the oscillation output from leaking to the rear of the gun diode mount when a groove for fitting the gun diode mount is provided in the conductor plate and the lower conductor plate.

[0019]

In order to solve the above-mentioned conventional problems, a Gunn oscillator according to the present invention comprises a non-radiative dielectric line (hereinafter referred to as an NRD guide) holding a dielectric strip between conductor plates separated in parallel. ) Is used as an output line, and a Gunn diode is used as an oscillating element. The Gunn diode mount holding the Gunn diode on the side surface and the Gunn diode mount and the conductor plate are provided on the contact surface of the conductor plate. At least two or more projections in which the length of the contact portion of the gun diode in the axial direction is an odd multiple of a quarter wavelength in the free space of the oscillation frequency; A concave portion whose length is an odd multiple of a quarter wavelength in the free space of the oscillation frequency.

With this configuration, the heat generated by the Gunn diode can be easily transmitted to the upper conductor plate and the lower conductor plate, and damage of the Gunn diode due to the heat can be prevented. When a groove for fitting the diode mount is provided, it is possible to provide a gun oscillator that can prevent the oscillation output from leaking to the rear of the gun diode mount.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gun oscillator according to a first aspect of the present invention comprises a nonradiative dielectric line (hereinafter referred to as an NRD guide) which holds a dielectric strip between conductor plates separated in parallel. A gun oscillator using a Gunn diode as the oscillation element, the contact length between the Gunn diode mount and the conductive plate holding the Gunn diode on the side, and the contact length between the Gunn diode mount and the conductive plate in the gun diode axial direction. Is a quarter of the oscillation frequency in free space
At least two or more convex portions having an odd multiple of the wavelength, a concave portion sandwiched between the convex portions and having a length in the axial direction of the Gunn diode which is an odd multiple of a quarter wavelength in free space of the oscillation frequency;
It has the structure provided with.

This configuration has the following operation.

(1) The length of the contact portion between the Gunn diode mount and the groove provided on the upper conductor plate and the length of the contact portion between the Gunn diode mount and the groove provided on the lower conductor plate are oscillated. Since the frequency becomes an odd multiple of a quarter wavelength of the frequency, the gun diode mount and the conductor plate are almost short-circuited at high frequency at the contact point between the gun diode mount and the conductor plate on the gun diode side. Leakage to the rear of the gun diode mount can be prevented.

(2) The length of the contact portion between the gun diode mount and the conductor plate in the gun diode axial direction can be increased and the area can be increased, so that the heat generated from the gun diode during the oscillation operation is reduced by the radiator. It can be easily transmitted to the conductor plate that also serves as the conductor plate, and damage to the gun diode due to heat can be prevented.

(3) The length of the contact portion between the protrusion provided on the upper surface of the Gunn diode mount and the upper conductor plate and the length of the contact portion between the protrusion provided on the lower surface of the Gunn diode mount and the lower conductor plate. When the length is increased to 3/4 wavelength and 5/4 wavelength in the free space of the oscillation frequency, the length of the contact portion between the gun diode mount and the conductor plate increases, and the heat from the gun diode to the conductor plate is easily transmitted. can do.

According to a second aspect of the present invention, there is provided the gun oscillator according to the first aspect, wherein each of the conductor plates has a groove into which a gun diode mount is fitted.

With this configuration, in addition to the function of the first aspect,
It has the following functions.

(1) Since the contact area between the conductor plate and the Gunn diode mount can be increased, the heat generated by the Gunn diode can be easily transmitted to the conductor plate, and damage to the Gunn diode due to the heat can be prevented.

According to a third aspect of the present invention, there is provided the gun oscillator according to the first or second aspect, wherein the convex portion and the concave portion are formed on a contact surface of the gun diode mount with the conductor plate. Having.

According to this configuration, the following operation is obtained in addition to the operation of the first or second aspect.

(1) The thickness between the conductor plates can be reduced as compared with the case where a recess is provided in the groove provided in the upper conductor plate and the groove provided in the lower conductor plate. Can be thin.

According to a fourth aspect of the present invention, there is provided the gun oscillator according to any one of the first to third aspects, wherein the projections and the depressions are in contact with the gun diode mount of the conductor plate. It has a configuration formed on the surface.

According to this configuration, the following operation is obtained in addition to the operation of any one of the first to third aspects.

(1) Since the depth of the concave portion can be made deeper than when the concave portion is provided in the Gunn diode mount, the difference in impedance between the contact portion of the Gunn diode mount and the conductor plate can be increased, and the Gunn diode mount can be increased. Oscillation output leakage to the rear can be further reduced.

According to a fifth aspect of the present invention, there is provided the gun oscillator according to any one of the first to fourth aspects, wherein the depth of the concave portion is formed to be 0.5 mm or more. Having.

With this configuration, in addition to the function of any one of the first to fourth aspects, the following function is provided.

(1) By setting the depth of the recess to 0.5 mm or more, even if a gap is formed between the Gunn diode mount and the conductor plate, the power leaking through the gap can be extremely reduced.

According to a sixth aspect of the present invention, there is provided the gun oscillator according to any one of the first to fourth aspects, wherein the conductive plate and the upper conductive plate with which the upper surface of the gun diode mount is in contact. The lower surface of the Gunn diode mount is in contact with the lower conductor plate, and the protrusions and recesses are in contact with the upper and lower conductor plates of the Gunn diode mount, and
The upper and lower conductor plates are formed on contact surfaces with the Gunn diode mount, and the concave portions formed on the Gunn diode mount upper surface and the concave portions formed on the upper conductor plate have the same axial length and position of the Gunn diode. The concave portion formed on the lower surface of the gun diode mount and the concave portion formed on the lower conductor plate have the same length and position in the axial direction of the gun diode, and the depth of the concave portion formed on the upper conductor plate and the concave portion formed on the upper surface of the gun diode mount. A configuration in which the combined length of the formed recess and the combined depth of the recess formed in the lower conductor plate and the depth of the recess formed in the lower surface of the gun diode mount are 0.5 mm or more. Having.

With this configuration, the following operation is obtained in addition to the operation of any one of the first to fourth aspects.

(1) Since the recesses are formed in the Gunn diode mount, the upper conductor plate, and the lower conductor plate, the cross-sectional area of the space inside the recesses increases, and the Gunn diode mount, the upper conductor plate, and the lower conductor plate are formed. The impedance difference between the contact portion and the concave portion can be increased, and leakage of oscillation output to the rear of the Gunn diode mount can be further reduced.

The sum of the depth of the concave portion provided on the upper conductor plate and the depth of the concave portion provided on the upper surface of the gun diode mount is 0.5 mm or more. If the combined length of the recesses provided on the lower surface of the diode mount is 0.5 mm or more, it is possible to make the oscillation output hardly leak, but the longer the length, the less the leakage power The effect is high.

The invention according to claim 7 of the present invention is the gun oscillator according to any one of claims 1 to 6, wherein the depth of the recess formed in the upper conductor plate and the lower conductor It has a configuration in which the recesses formed in the plate have the same depth.

According to this configuration, the following operation is obtained in addition to the operation of any one of the first to sixth aspects.

(1) The upper conductor plate and the lower conductor plate do not have to be changed in the depth to be cut when machining the recesses on the upper conductor plate and the lower conductor plate using a metal working machine such as a milling machine. Plate production efficiency can be increased. That is, it is possible to efficiently produce a Gunn oscillator with less leakage of oscillation output to the rear of the Gunn diode mount.

The invention according to claim 8 of the present invention is the gun oscillator according to any one of claims 2 to 7, wherein the depth of the groove formed in the upper conductor plate and the lower conductor It has a configuration in which the depths of the grooves formed in the plate are equal.

(1) When grooves are formed on the upper and lower conductor plates using a metal working machine such as a milling machine, a step of changing the depth of the grooves is not required, and the upper and lower conductor plates and the lower conductor plate are not required. The production efficiency of the conductor plate can be increased, and a gun oscillator with less leakage of the oscillation output to the rear of the gun diode mount can be efficiently produced.

Hereinafter, an embodiment of the present invention will be described.

(Embodiment 1) FIG. 1 (a) is a perspective view of the entire structure of a gun oscillator according to Embodiment 1, and FIG.
FIG. 1B is a sectional view of a main part of a gun diode portion of the gun oscillator according to the first embodiment, and FIG. 1C is a sectional view of FIG.
FIG. 2A is a graph showing a simulation result of leakage power with respect to a depth of a concave portion, and FIG. 2B is a diagram showing a gun diode portion of a gun oscillator according to a second embodiment. FIG. 2 is a sectional view of a main part, and FIG.
FIG. 2C is an explanatory diagram showing an equivalent circuit of FIG. FIG. 2A shows a simulation result of the leakage power with respect to the depth of the concave portion when a gap occurs between the Gunn diode mount and the upper conductor plate. In the first embodiment, the grooves provided in the upper conductor plate and the lower conductor plate of the gun oscillator are made equal in depth, and vertically symmetric concave and convex portions are provided on the upper and lower surfaces of the gun diode mount. It is.

In the drawing, reference numeral 2 denotes a gun diode mount, 2a
Is a gun diode, 5 is a cathode terminal, 6 is a bias line, 7 is an anode terminal, 8 is a strip line, 9 is a dielectric strip, 10 is a mode suppressor, 11 is an upper conductor plate, 11a is a lower conductor plate, 12 is The terminals 12a are the same as those described with reference to FIG. 6, and thus the same reference numerals are given and the description is omitted. 1 is a Gunn oscillator according to the first embodiment, 31 is an end point of a contact portion between the Gunn diode mount 2 and the upper conductor plate 11 and the lower conductor plate 11a, 32 is a groove provided in the upper conductor plate 11, and 33 is a lower conductor plate A groove provided in 11a, 34a is an upper surface side concave portion provided on the upper surface of Gunn diode mount 2, 34b is a lower surface side concave portion provided on the lower surface of Gunn diode mount 2 and whose length is a quarter wavelength of the oscillation frequency. , 35a, 35b are upper surface side protrusions provided on the upper surface of the Gunn diode mount 2, and 35c, 35d are lower surface side protrusions provided on the lower surface of the Gunn diode mount 2. In addition, A, D, E, and A ', B', C ', D', and E 'shown with arrows in FIGS. 1B and 1C indicate the lengths of the respective portions. ing. A, A ', E, and E' are equal in length, the combined length of A and B, the combined length of A 'and B', the combined length of D and E, and D 'and E ′ Is a three-quarter wavelength in the free space of the oscillation frequency, and C and C ′ are 4/4 wavelengths in the free space of the oscillation frequency.
One-half wavelength. In FIG. 1B, the illustration of the strip line 8 is omitted.

In the Gunn oscillator 1 shown in FIG. 1, when the cathode terminal 5 is connected to the terminal 12a connected via the Gunn diode mount 2 and the terminal 12 is connected to the anode terminal 7 via the bias line 6, a bias voltage is applied. A high-frequency signal is generated and output from the dielectric strip 9 via the strip line 8.

In the conventional gun oscillator, depending on the machining accuracy of the gun diode mount 2, the groove 32 provided in the upper conductor plate 11, or the groove 33 provided in the lower conductor plate 11a, the gun diode mount 2 and the upper conductor plate A gap may be formed between the groove 32 provided in the groove 11 or the groove 33 provided in the Gunn diode mount 2 and the lower conductor plate 11a, and the oscillation output may leak from this gap.
In the structure of the Gunn diode mount 2 shown in (b), even when a gap occurs between the Gunn diode mount 2 and the upper conductor plate 11, or a gap occurs between the Gunn diode mount 2 and the lower conductor plate 11a. In both cases and when gaps are formed in both gaps, the equivalent circuit of FIG. 1C is established for each gap, and the gun diode mount 2 is connected to the contact point end point 31 between the upper conductor plate 11 and the lower conductor plate 11a. The impedance Z _M seen from the diode mount 2 side is very small, and the contact end point 31 can be regarded as almost short-circuited in terms of high frequency. Therefore, even when a sufficient machining accuracy is not obtained and a gap is generated between the gun diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a,
Even if a gap is formed between the upper and lower conductor plates 11 and the Gunn diode mount 2 and the lower conductor plate 11a, the oscillation output can be prevented from leaking to the rear of the Gunn diode mount 2. In FIG. 1C, Z _O is the impedance of the transmission line composed of the upper conductor plate 11 and the lower conductor plate 11a, and has a relatively large value.

As shown in FIG. 1, the heat generated from the Gunn diode 2a is reduced by setting the length of the contact portion between the Gunn diode mount 2 and the upper and lower conductor plates 11 and 11a to 3/4 wavelength. The heat can be efficiently transmitted to the upper conductor plate 11 and the lower conductor plate 11a, and damage to the Gunn diode 2a due to heat can be prevented. If the heat generated by the Gunn diode 2a still does not sufficiently transfer to the upper conductor plate 11 and the lower conductor plate 11a, the wavelength may be increased to 5/4 wavelength or 7/4 wavelength.

The upper concave portion 34a and the lower concave portion 34
Regarding the depth b, as can be seen from the simulation result of the leakage power with respect to the depth of the recess when a gap of 0.05 mm is formed between the Gunn diode mount and the upper conductor plate shown in FIG. Is preferably set to 0.5 mm or more, in which almost no is present. Note that FIG.
(A) is a simulation result at 60 GHz,
As shown in FIG. 2B, the simulation model used here has a structure in which a Gunn diode mount having a concave portion on the upper surface is sandwiched between an upper conductor plate having a thickness of zero and a lower conductor plate. The distance between the plate and the lower conductor plate is 60GH
It is 2.25 mm, which is generally used in the z-band NRD guide, the length of the convex portion of the Gunn diode mount is 3.75 mm, which is three quarter wavelengths, and the length of the concave portion is one quarter wavelength. 25 mm. The boundary conditions of the simulation model are as shown in FIG.
The both sides of the gun diode mount taken out with a width of
Electromagnetic waves transmitted through the gap between the Gunn diode mount and the upper conductor plate are transmitted by TEM (transverse electro
The magnetic wall is considered to be a magnetic wave.
In addition, since the electromagnetic wave leaking out of the gap between the gun diode mount and the upper conductor plate does not return again after transmitting between the upper conductor plate and the lower conductor plate, an absorption boundary condition is set at a position 5 mm away from the gun diode mount. You have set. In the result of FIG. 2A, the ratio between the incident power from the input terminal surface and the reflected power is obtained by simulation based on the shape and the boundary condition of the simulation model, and the leakage power is calculated from the value. . Note that HFSS Ver5.4, which is electromagnetic field simulation software from HEWLETT PACKARD, is used for the simulator.

FIG. 2 shows a simulation result of power leakage when a gap is formed between the Gunn diode mount and the upper conductor plate. This result shows that a gap is formed between the Gunn diode mount and the lower conductor plate. This is also true of the case where the gap is formed between both, and if the depth of the recess is 0.5 mm or more, the leakage power can be sufficiently reduced.

In the simulation model shown in FIG. 2, no grooves are provided on the upper and lower conductor plates.
The effect of reducing the leakage power due to the depth of the concave portion provided in the Gunn diode mount is the same as when the Gunn diode mount is fitted by providing grooves in the upper and lower conductor plates. The depth of the concave portion of the diode mount 2 may be determined based on the simulation result of FIG.

FIG. 2A shows a simulation result at 60 GHz. When a gap is formed between the Gunn diode mount and the upper conductor plate or the lower conductor plate, the mode of the electromagnetic wave transmitted therethrough is the TEM mode. Therefore, the result of FIG. 2A may be applied to all frequencies.

As described above, since the gun oscillator according to the first embodiment is configured, sufficient machining accuracy cannot be obtained, and a gap is formed between the gun diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a. If it does,
Even when a gap is formed between the gun diode mount 2 and the upper conductor plate 11 and between the gun diode mount 2 and the lower conductor plate 11a, the effect that the oscillation output can be prevented from leaking to the rear of the gun diode mount 2 can be obtained. Have.

(Embodiment 2) FIG. 3 (a) is a perspective view of the entire structure of a gun oscillator according to Embodiment 2, and FIG.
FIG. 3B is a sectional view of a main part of a gun diode portion of the gun oscillator according to the second embodiment, and FIG. 3C is a sectional view of FIG.
FIG. 4 is an explanatory diagram showing an equivalent circuit of FIG. Embodiment 3
In the above, a concave portion is provided at a vertically symmetric position in a groove provided in an upper conductor plate and a lower conductor plate of a gun oscillator.

In FIG. 3, 2 is a gun diode mount, 2a is a gun diode, 5 is a cathode terminal, 6 is a bias line, 7 is an anode terminal, 8 is a strip line,
9 is a dielectric strip, 10 is a mode suppressor, 11
Is an upper conductor plate, 11a is a lower conductor plate, 12 is a terminal, 12
a is a terminal, 31 is a contact point end point, 32 is a groove, and 33 is a groove. These are the same as those described in FIG. 1a is a gun oscillator according to the second embodiment, 40a is an upper concave portion provided in the groove 32 of the upper conductor plate 11, and 40b is a lower conductor plate 11
The lower concave portions 41a and 41b provided in the groove 33a are the upper convex portions 41c and 41 provided in the groove 32 of the upper conductor plate 11.
d is an upper convex portion provided in the groove 33 of the lower conductor plate 11a. Note that F, G, H, I, J, and F ', G', H shown in FIG. 3B and FIG.
', I', and J 'indicate the length of each part.
F, F ', J, and J' have the same length, and the total length of F and G, the total length of F 'and G', and I and J
And the combined length of I 'and J'
3/4 wavelength in free space of oscillation frequency,
The length of H, H 'is a quarter wavelength in the free space of the oscillation frequency. In FIG. 3B, the illustration of the strip line 8 is omitted.

The gun oscillator shown in FIG.
Is terminal 1 connected via Gunn diode mount 2
2a is grounded, and when a bias voltage is applied from the terminal 12 to the anode terminal 7 via the bias line 6, a high-frequency signal is generated, and the dielectric strip 9
Output from

In the conventional gun oscillator, depending on the machining accuracy of the Gunn diode mount 2, the groove 32 provided in the upper conductor plate 11, or the groove 33 provided in the lower conductor plate 11a, the Gunn diode mount 2 and the upper conductor plate 11a may be used. A gap may be formed between the groove 32 provided in the groove 11 or the groove 33 provided in the gun diode mount 2 and the lower conductor plate 11a, and the oscillation output may leak through the gap.
In the structure of the Gunn diode mount section shown in (b), even when a gap occurs between the Gunn diode mount 2 and the upper conductor plate 11, or a gap occurs between the Gunn diode mount 2 and the lower conductor plate 11a. In both cases and when there is a gap in both, FIG.
(C) is established, the impedance Z _M seen from the contact point 31 of the gun diode mount 2 and the upper conductor plate 11 and the lower conductor plate 11 a toward the gun diode mount 2 side is very small. It can be considered that it is short-circuited at high frequency. Therefore, even when a sufficient machining accuracy is not obtained and a gap is formed between the gun diode mount 2 and the upper or lower conductor plate, the gun diode mount 2 and the upper conductor plate 11 and the gun diode mount 2 and the lower Oscillation output can be prevented from leaking to the rear of the Gunn diode mount 2 even when a gap is formed between both of the conductor plates 11a.

As shown in FIG. 3, by increasing the length of the contact portion between the Gunn diode mount 2 and the upper and lower conductor plates 11 and 11a to 3/4 wavelength, the heat generated by the Gunn diode 1 is increased. Can be efficiently transmitted to the upper conductor plate 11 and the lower conductor plate 11a, and damage to the Gunn diode 2a due to heat can be prevented. If the heat generated by the Gunn diode 2a still does not sufficiently transfer to the upper conductor plate 11 and the lower conductor plate 11a, the wavelength may be increased to 5/4 wavelength or 7/4 wavelength.

Note that also in the second embodiment, the relationship between the depth of the upper concave portion 40a and the lower concave portion 40b and the leakage power to the rear of the gun diode mount 2 is shown in FIG.
The simulation result shown in FIG. Therefore, the depth of the upper concave portion 40a and the lower concave portion 40b is 0.5 m.
m or more.

In the second embodiment, the upper conductor plate 11 and the lower conductor plate 11a having relatively large shapes are provided with the upper concave portion 40.
a) Since the lower concave portion 40b is provided, there is an advantage that the manufacturing becomes easier as compared with the first embodiment in which the concave portion is provided in the gun diode mount having a small shape.

As described above, since the gun oscillator according to the second embodiment is constructed, sufficient machining accuracy cannot be obtained, and even if a gap is generated between the gun diode mount 2 and the upper or lower conductor plate. Further, even when a gap is formed between the gun diode mount 2 and the upper conductor plate 11 and between the gun diode mount 2 and the lower conductor plate 11a, the oscillation output can be prevented from leaking to the rear of the gun diode mount 2. .

(Embodiment 3) FIG. 4 (a) is a perspective view of the entire structure of a gun oscillator according to Embodiment 3, and FIG.
FIG. 4B is a sectional view of a main part of a gun diode portion of the gun oscillator according to the third embodiment, and FIG. 4C is a sectional view of FIG.
FIG. 4 is an explanatory diagram showing an equivalent circuit of FIG. Embodiment 3
Has recesses in the grooves provided in the upper conductor plate and in the grooves provided in the lower conductor plate, and also has recesses in the Gunn diode mount.The length and position of each recess are vertically symmetric. And

In FIG. 4, 2 is a gun diode mount, 2a is a gun diode, 5 is a cathode terminal, 6 is a bias line, 7 is an anode terminal, 8 is a strip line,
9 is a dielectric strip, 10 is a mode suppressor, 11
Is an upper conductor plate, 11a is a lower conductor plate, 12 is a terminal, 12
a is a terminal, 31 is a contact point end point, 32 is a groove, and 33 is a groove. These are the same as those described in FIG. 1b is a Gunn oscillator according to the third embodiment, 42a and 42b are upper surface side protrusions formed on the upper surface of the Gunn diode mount 2, 42
Reference numerals c and 42d denote lower surface side protrusions formed on the lower surface of the Gunn diode mount 2, 43a denotes upper surface side recesses provided on the upper surface of the Gunn diode mount 2, and 43b denotes lower surface side recesses provided on the lower surface of the Gunn diode mount 2. , 44a are upper concave portions provided in the groove 32 of the upper conductor plate 11, and 44b are lower concave portions provided in the groove 33 of the lower conductor plate 11a. It should be noted that K, L, M, N, and K ′, L ′, M ′, shown with arrows in FIG. 4B and FIG.
N 'indicates the length of each part. K and K 'have the same length, the length obtained by combining K and L, the length obtained by combining K' and L ', and N and N' are three quarter wavelengths in the free space of the oscillation frequency. M and M 'are quarter wavelengths in the free space of the oscillation frequency. In FIG. 4B, the strip line 8 is omitted.

The gun oscillator shown in FIG.
Is terminal 1 connected via Gunn diode mount 2
2a is grounded, and when a bias voltage is applied from the terminal 12 to the anode terminal 7 via the bias line 6, a high-frequency signal is generated, and the dielectric strip 9
Output from

In the conventional gun oscillator, depending on the machining accuracy of the gun diode mount 2, the groove 32 provided in the upper conductor plate 11, or the groove 33 provided in the lower conductor plate 11a, the gun diode mount 2 and the upper conductor plate A gap may be formed between the groove 32 provided in the groove 11 or the groove 33 provided in the gun diode mount 2 and the lower conductor plate 11a, and the oscillation output may leak through the gap.
In the structure of the Gunn diode mount section shown in (b), even when a gap occurs between the Gunn diode mount 2 and the upper conductor plate 11, or a gap occurs between the Gunn diode mount 2 and the lower conductor plate 11a. 4C, the equivalent circuit of FIG. 4C is established for each of the gaps, and the gun diode mount 2 and the contact point 31 of the upper conductor plate 11 and the lower conductor plate 11a contact each other. The impedance Z _M seen from the diode mount 2 side is very small, and the contact end point 31 can be regarded as being almost short-circuited in terms of high frequency.

Therefore, even when a sufficient machining accuracy is not obtained and a gap is formed between the gun diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a, the gun diode mount 2 and the upper conductor plate 11 and Even when a gap is formed between both the gun diode mount 2 and the lower conductor plate 11a, the oscillation output is
It can be prevented from leaking backward.

Incidentally, the upper concave portion 4 provided in the upper conductive plate
4a and the upper surface concave portion 43a provided on the upper surface of the Gunn diode mount 2, and the lower concave portion 44b provided on the lower conductor plate and the lower surface side concave portion 43b provided on the lower surface of the Gunn diode mount 2 were combined. Fig. 2
This corresponds to the depth of the groove in (a). Therefore, the depth of the upper concave portion 44a provided on the upper conductor plate and the upper concave portion 43a provided on the upper surface of the Gunn diode mount 2, and the lower concave portion 44b provided on the lower conductor plate and the lower surface of the Gunn diode mount 2 In order to suppress leakage of electromagnetic waves to the rear of the gun diode mount 2, it is desirable that the combined depth of the lower surface side recessed portions 43b provided in each of them is 0.5 mm or more.

In the embodiment shown in FIG. 4, since concave portions are provided on the upper and lower surfaces of Gunn diode mount 2 and on both upper conductor plate 11 and lower conductor plate 11a, the embodiment shown in FIG. 2 or FIG. The depth of the concave portion can be increased and the effect of suppressing the leakage of the oscillation output can be further increased, as compared with the case where the concave portion is provided on one of the sides as shown in the embodiment.

As shown in FIG. 4, by increasing the length of the contact portion between the Gunn diode mount 2 and the upper and lower conductor plates 11 and 11a to 3/4 wavelength, the heat generated by the Gunn diode 2a is increased. Can be efficiently transmitted to the upper conductor plate 11 and the lower conductor plate 11a, and damage to the Gunn diode 2a due to heat can be prevented. Note that the heat generated by the Gunn diode 2a is still higher than the upper conductor plate 11,
If not sufficiently transmitted to the lower conductor plate 11a, 4
It may be as long as 5/5 wavelength or 7/4 wavelength.

As described above, since the gun oscillator according to the third embodiment is configured, sufficient machining accuracy cannot be obtained, and a gap is formed between the gun diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a. If it does,
Even if a gap is formed between the gun diode mount 2 and the upper conductor plate 11 and between the gun diode mount 2 and the lower conductor plate 11a, the oscillation output can be prevented from leaking to the rear of the gun diode mount 2. Has an action.

(Embodiment 4) FIG. 5A is a perspective view of the entire structure of a Gunn oscillator according to Embodiment 4, and FIG.
FIG. 13B is a cross-sectional view of a main part of a gun diode part of the gun oscillator according to the fourth embodiment. Embodiment 4
The length of the convex portion on the gun diode side of the gun diode mount is set to 3/4 wavelength so that heat is easily transmitted from the gun diode of the gun oscillator to the upper conductor plate and the lower conductor plate.

In FIG. 5, 2 is a gun diode mount, 2a is a gun diode, 5 is a cathode terminal, 6 is a bias line, 7 is an anode terminal, 8 is a strip line,
9 is a dielectric strip, 10 is a mode suppressor, 11
Is an upper conductor plate, 11a is a lower conductor plate, 12 is a terminal, 12
a is a terminal, 31 is a contact end point, and these are the same as those described in FIG. 6, so the same reference numerals are given and the description is omitted. 1c is a Gunn oscillator according to the fourth embodiment, 50a and 50b are upper surface side protrusions formed on the upper surface of the Gunn diode mount 2, 50c and 50d are lower surface side protrusions formed on the lower surface of the Gunn diode mount 2, 51
a is an upper surface side concave portion provided on the upper surface of the Gunn diode mount 2, and 51b is a lower surface side concave portion provided on the lower surface of the Gunn diode mount 2. Note that O, P, Q, and O ′, P ′, Q ′ indicated with arrows in FIG.
Indicates the length of each part. O and O 'have the same length, P and P' have the same length, and Q and Q 'have the same length. O and O 'are three quarter wavelengths in the free space of the oscillation frequency, P and P', and Q and Q 'are quarter wavelengths in the free space of the oscillation frequency. In FIG. 5B, the illustration of the strip line 8 is omitted.

The gun oscillator 1 of the fourth embodiment shown in FIG.
6 is different from the conventional gun oscillator 1d shown in FIG. 6 in the length O of the upper surface side protrusion 50a and the length O 'of the lower surface side protrusion 50c provided on the gun diode mount 2, and The heat generated by the Gunn diode 2a is transmitted to the upper conductor plate 11 and the lower conductor plate 11a by increasing the length of the contact portion between the upper conductor plate 2 and the upper conductor plate 11 and between the gun diode mount 2 and the lower conductor plate 11a. Making it easier. In the embodiment shown in FIG. 5, the upper convex portions 50b and 50d of the Gunn diode 2a have a quarter wavelength in the free space of the oscillation frequency. However, if the size of the Gunn diode mount 2 is not restricted, these are also used. Oscillation frequency 4
It is also possible to make heat easier to transmit by setting the wavelength to 3 / min. If it is desired to further increase the thermal conductivity, the upper surface side protrusions 50 a, 5 a
0b and the lower surface side projections 50c and 50d may be further extended to 5/4 wavelength or 7/4 wavelength of the oscillation frequency.
In addition, the upper surface side convex portions 50a and 50b, the lower surface side convex portions 50c,
50d length, upper surface side recess 51a, lower surface side recess 5
If the length of 1b is an odd multiple of a quarter wavelength of the oscillation frequency, the impedance seen from the contact end point 31 toward the Gunn diode mount 2 can be close to a high-frequency short-circuit state. Even if a gap occurs between the gun diode mount 2 and the upper conductor plate 11 or the lower conductor plate 11a due to an error or the like, the gun diode mount 2 and the upper conductor plate 11 and the gun diode mount 2 and the lower conductor plate 11 Even if there is a gap between both of them, the oscillation output can be prevented from leaking to the rear of the Gunn diode mount.

As described above, since the Gunn oscillator according to the fourth embodiment is configured, the lengths of the contact portions between the Gunn diode mount 2 and the upper conductor plate 11 and between the Gunn diode mount 2 and the lower conductor plate 11a are reduced. By increasing the length, heat generated by the Gunn diode 2a is transferred to the upper conductor plate 11
And the lower conductor plate 11a can be easily transmitted, and the gun diode is less likely to be damaged by heat.

[0079]

As described above, according to the Gunn oscillator of the present invention, the following advantageous effects can be obtained.

According to the first aspect of the present invention, (1) the gun diode mount and the conductor plate are almost short-circuited at high frequency at the contact point between the gun diode mount and the conductor plate on the gun diode side, A gun oscillator capable of preventing the oscillation output from leaking to the rear of the gun diode mount can be provided.

(2) The heat generated from the Gunn diode during the oscillation operation can be easily transmitted to the conductor plate also serving as a radiator, and a Gunn oscillator capable of preventing the Gunn diode from being damaged by the heat can be provided.

(3) The length of the contact portion between the protrusion provided on the upper surface of the Gunn diode mount and the upper conductor plate and the length of the contact portion between the protrusion provided on the lower surface of the Gunn diode mount and the lower conductor plate. When the length is increased to 3/4 wavelength and 5/4 wavelength in the free space of the oscillation frequency, the length of the contact portion between the gun diode mount and the conductor plate increases, and the heat from the gun diode to the conductor plate is easily transmitted. Can be provided.

According to the invention described in claim 2, according to claim 1
In addition to the effects of (1), since the contact area between the conductor plate and the gun diode mount can be increased, the heat generated by the gun diode can be easily transmitted to the conductor plate, and the durability of the gun diode can be prevented due to the heat. An excellent Gunn oscillator can be provided.

According to the invention set forth in claim 3, according to claim 1
In addition to the effects of (2), (1) the thickness between the conductor plates can be reduced as compared with the case where a recess is provided in the groove provided in the upper conductor plate and the groove provided in the lower conductor plate. Thus, it is possible to provide a gun oscillator that can make the gun oscillator thin.

According to the invention set forth in claim 4, according to claim 1
In addition to the effects of any one of (3) to (3), (1) Since the depth of the concave portion can be made deeper than in the case where the concave portion is provided in the Gunn diode mount, the impedance difference between the contact portion between the Gunn diode mount and the conductor plate Can be increased, and a gun oscillator that can further reduce the leakage of oscillation output to the rear of the gun diode mount can be provided.

According to the invention set forth in claim 5, according to claim 1,
In addition to the effects of any one of (1) to (4), (1) By making the depth of the concave portion 0.5 mm or more
Even if a gap occurs between the Gunn diode mount and the upper conductor plate or the lower conductor plate, it is possible to provide a Gunn oscillator capable of extremely reducing the power leaking therethrough.

According to the invention of claim 6, according to claim 1,
In addition to the effects of any one of (4) to (4), (1) Since the concave portion is formed in the Gunn diode mount and the upper and lower conductor plates, the cross-sectional area of the space inside the concave portion increases, and the Gunn diode mount And an impedance difference between a contact portion and a concave portion of the upper and lower conductor plates and the lower conductor plate, and a leakage of oscillation output to the rear of the gun diode mount can be further reduced. .

According to the invention of claim 7, according to claim 1,
In addition to the effect of any one of the above items 6 to 6, (1) When machining the concave portion on the upper conductor plate and the lower conductor plate using a metal working machine such as a milling machine, the depth to be shaved is not changed. As a result, the production efficiency of the upper and lower conductor plates can be increased. That is, it is possible to provide a Gunn Oscillator with excellent productivity that can efficiently produce a Gunn Oscillator with less leakage of oscillation output to the rear of the Gunn diode mount.

According to the invention of claim 8, according to claim 2,
7) In addition to the effects of any one of 7 to 7, (1) a step of changing the depth of the groove when processing the groove on the upper conductor plate and the lower conductor plate using a metal processing machine such as a milling machine. The present invention provides a highly productive gun oscillator that can efficiently produce a gun oscillator that can reduce the leakage of oscillation output to the rear of the gun diode mount by increasing the production efficiency of the upper conductor plate and the lower conductor plate. be able to.

[Brief description of the drawings]

1A is a perspective view of the entire structure of a gun oscillator according to a first embodiment. FIG. 1B is a sectional view of a main part of a gun diode portion of the gun oscillator according to the first embodiment. FIG. 1C is an equivalent circuit of FIG. Explanatory diagram showing

2A is a graph showing a simulation result of leakage power with respect to a depth of a concave portion. FIG. 2B is an explanatory diagram showing dimensions of a simulation model. FIG. 2C is an explanatory diagram showing boundary conditions of the simulation model.

3A is a perspective view of the entire structure of a gun oscillator according to a second embodiment. FIG. 3B is a cross-sectional view of a main part of a gun diode portion of the gun oscillator according to the second embodiment. FIG. 3C is an equivalent circuit of FIG. Explanatory diagram showing

4A is a perspective view of the entire structure of a gun oscillator according to a third embodiment. FIG. 4B is a sectional view of a main part of a gun diode portion of the gun oscillator according to the third embodiment. FIG. 4C is an equivalent circuit of FIG. Explanatory diagram showing

5A is a perspective view of the entire structure of a gun oscillator according to a fourth embodiment. FIG. 5B is a cross-sectional view of a main part of a gun diode portion of the gun oscillator according to the fourth embodiment.

FIG. 6A is a perspective view showing the entire structure of a conventional gun oscillator. FIG. 6B is a sectional view of a main part of a gun diode portion of the conventional gun oscillator.

7A is a diagram showing the entire structure of a conventional high-frequency signal generator. FIG. 7B is a cross-sectional view of a main part of a Gunn diode portion of the conventional high-frequency signal generator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d Gunn oscillator 2 Gunn diode mount 2a Gunn diode 3a, 3b Concave part 4a, 4b, 4c, 4d Convex part 5 Cathode terminal 6 Bias line 7 Anode terminal 8 Strip line 9 Dielectric strip 10 Mode suppressor DESCRIPTION OF SYMBOLS 11 Upper conductor plate 11a Lower conductor plate 12, 12a Terminal 20 High frequency signal generator 21 Gun diode mount 22 Gun diode 23 Cathode terminal 24 Bias line 25 Anode terminal of Gun diode 22 26 Strip line 27 Dielectric strip 28 Mode suppressor 29 Upper Conductor plate 29a Lower conductor plate 30, 30a Terminal 31 Contact portion end point 32, 33 Groove 34a, 43a, 51a Upper surface side recess 34b, 43b, 51b Lower surface side recess 35a, 35b, 42a, 42b, 50a, 0b upper surface protrusion 35c, 35d, 42c, 42d, 50c, 50d lower surface-side protrusion 40a, 44a upper recess 40b, 44b lower recesses 41a, 41b upper protrusion 41c, 41d lower protrusion

Continuing on the front page (72) Inventor Takahiro Tamae 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Person Fuji Kuroki 6-8 Tsunouchi-cho, Kure-shi, Hiroshima F-term (reference) 5J011 BA04 5J014 HA06

Claims (8)

[Claims] 1. A gun oscillator using a non-radiative dielectric line (hereinafter, referred to as an NRD guide) for holding a dielectric strip between conductor plates separated in parallel as an output line and using a Gunn diode as an oscillation element. The length of the contact portion between the gun diode mount and the conductor plate in the gun diode axial direction at the contact surface between the gun diode mount holding the side surface of the gun diode and the conductor plate is four minutes in the free space of the oscillation frequency. At least two or more convex portions that are odd multiples of one wavelength, and the length of the Gunn diode in the axial direction sandwiched between the convex portions is an odd multiple of a quarter wavelength in the free space of the oscillation frequency. A gun oscillator comprising: a concave portion. 2. The semiconductor device according to claim 1, wherein each of said conductor plates has a groove into which said gun diode mount is fitted.
A gun oscillator according to claim 1. 3. The Gunn oscillator according to claim 1, wherein the convex portion and the concave portion are formed on a contact surface of the Gunn diode mount with the conductor plate. 4. The gun oscillator according to claim 1, wherein said convex portion and said concave portion are formed on a contact surface of said conductor plate with said Gunn diode mount. . 5. The method according to claim 1, wherein the depth of the recess is 0.5 mm or more.
The gun oscillator according to the paragraph. 6. The gun diode mount according to claim 6, wherein said conductor plate comprises an upper conductor plate in contact with said gun diode mount upper surface and a lower conductor plate in contact with said gun diode mount lower surface. A concave surface formed on a contact surface between the upper conductor plate and the lower conductor plate, and a contact surface between the upper conductor plate and the lower conductor plate with the gun diode mount, and formed on an upper surface of the gun diode mount; And the axial length and position of the gun diode of the recess formed in the upper conductor plate are equal,
A concave portion formed on the lower surface of the gun diode mount,
The axial length and position of the concave portion formed in the lower conductor plate are equal to the axial length of the gun diode, and the depth of the concave portion formed in the upper conductive plate and the depth of the concave portion formed on the upper surface of the gun diode mount are determined. The sum of the combined length and the depth of the recess formed in the lower conductor plate and the depth of the recess formed on the lower surface of the Gunn diode mount is 0.5.
The gun oscillator according to any one of claims 1 to 4, wherein the diameter is equal to or larger than mm. 7. The method according to claim 1, wherein the depth of the recess formed in the upper conductor plate is equal to the depth of the recess formed in the lower conductor plate. The described gun oscillator. 8. A depth of a groove formed in the upper conductor plate;
The gun oscillator according to any one of claims 2 to 7, wherein grooves formed in the lower conductor plate have the same depth.