JPH09219601A - Connection/installation structure of diode mounted substrate in nrd guide diode circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mass-produce a non-radiative dielectric line(NRD) guide diode circuit having a prescribed circuit characteristic with excellent reproducibility and to prevent a circuit characteristic from changing due to the positional deviation after an assembling. SOLUTION: This connection/installation structure is composed of a dielectric strip line in which an NRD guide is defined as a principle and a diode mounted substrate for which a diode circuit is composed and which is arranged by crossing the dielectric strip line. At this time, an inserting coaxial connector by a conductive connection pin 6 and a coaxial socket jack 7 which make a pair with each other is fixed and arranged in a conductive connection state at the connection point part 5 with the external circuit formed at both end parts of the diode mounted substrate 1 and a lower conductive plate 102. By the mutual inserting connection of this coaxial connector, the diode mounted substrate 1 is fixed and mounted to/on the lower conductive plate 102 and the diode circuit of the diode mounted substrate 1 is made a closed circuit.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an NRD guide /
The connection / mounting structure of a diode mounting board in a diode circuit, particularly the connection / mounting structure of a diode mounting board in an NRD guide / diode circuit used in a microwave or millimeter wave band circuit.

[0002]

2. Description of the Related Art As a dielectric line used for transmission of microwaves and millimeter waves, as shown in FIG. 7, an upper conductor plate 101 and a lower conductor plate, which are vertically arranged in parallel at a predetermined interval. A shield type NR in which a rectangular rod-shaped dielectric strip line material 103 having a height a and a line width b is arranged between
A shield-type dielectric strip line based on the principle of a D guide (Non Radiation Dielectric Wave Guuide) is known.

In this NRD guide, generally, assuming that the free space wavelength of the signal frequency used is λo, the height a of the dielectric strip line material 103 is a <(λo / 2), and the line width b is approximately b. = Λo is set.

A conventional example of an NRD guide / diode circuit composed of a dielectric strip line by the NRD guide as described above and a diode mounting substrate which is configured as a diode circuit and is arranged across the dielectric strip line is illustrated. 8 is shown. Diode mounting substrate 111
Has a pair of electrode pattern portions 113 formed on one surface portion (front surface) of the dielectric substrate 112 by etching, and the beam read diode 114 is mounted between the pair of electrode pattern portions 113. The electrode pattern portion 113 is a portion that changes a high frequency electric field due to the dielectric strip line into a diode applied voltage.
The area of 13 has an optimum value in terms of circuit characteristics.

The diode mounting substrate 111 is mounted on the lower conductor plate 102 in such a manner that the electrode pattern portion 113 has a positional relationship in which the dielectric strip line member 103 is directly opposed to the front and rear dielectric strip line member 103 by pressure bonding. The connection points 115 with the external circuits formed on both ends of the diode mounting substrate 111 are connected to the lower conductor plate 102.
Is electrically connected to the coaxial terminal 116 embedded in the lead wire 117 by the lead wire 117, and this conductive connection makes the diode circuit of the diode mounting substrate 111 a closed circuit.
The guide diode circuit is established.

[0006]

The conventional N as described above is used.
In the RD guide / diode circuit, the diode mounting substrate 111 includes front and back dielectric strip line materials 103.
It is fixed on the lower conductor plate 102 only by pressing, and in this board mounting, the mounting position of the diode mounting board 111 in the left-right direction (the direction indicated by the arrow A in FIG. 7) is not restricted. It is difficult to maintain the mounting position accuracy of the diode mounting substrate 111 with respect to the high accuracy without including the assembly variation. As a result, the electrode pattern portion 113 is connected to the dielectric strip line member 10
It is difficult to position it at a fixed position with respect to the line cross section of No. 3, and it is difficult to mass-produce the NRD guide diode circuit having predetermined circuit characteristics with good reproducibility due to variations in assembly accuracy.

The front and rear dielectric strip line members 103
Since there is a possibility that they are arranged off-axis, it is difficult to mass-produce the NRD guide diode circuit having predetermined circuit characteristics with good reproducibility.

Further, due to the temperature cycle, a gap is created between the dielectric strip line member 103 and the diode mounting substrate 111, which may change the circuit characteristics.

Further, in the conventional NRD guide diode circuit, the lead wire 117 is a fine wire, has no rigidity, and does not have a function of fixing the diode mounting board 111 to the initial mounting position.
There is a possibility that the diode mounting substrate 111 may shift to the left and right after the mounting, and there is a problem that the circuit characteristic changes due to this shifting. In addition, there is a possibility that the lead wire 117 may be deformed by the displacement and may come into contact with another circuit component member, thereby changing the circuit characteristics of the entire microwave / millimeter wave band circuit circuit.

Further, in the conventional NRD guide diode circuit, since the relatively long lead wire 117 is exposed to the outside, one component of the signal goes in and out of the lead wire 117, which causes noise to go in and out. There is also.

The present invention has been made by paying attention to the above-mentioned problems, and has a predetermined circuit characteristic by arranging the diode mounting substrate in a highly accurate and mass-producible manner. It is possible to mass-produce an NRD guide diode circuit with good reproducibility, and to provide an NRD guide diode circuit in which circuit characteristics do not fluctuate due to a positional shift after assembly and a temperature cycle, and noise does not come and go. Has an aim.

[0012]

In order to achieve the above object, the invention according to claim 1 is a dielectric strip between an upper conductor plate and a lower conductor plate which are vertically arranged in parallel at a predetermined interval. In an NRD guide diode circuit composed of a dielectric strip line based on an NRD guide in which a line material is arranged and a diode mounting substrate which is arranged across the dielectric strip line and constitutes a diode circuit. In the connection / mounting structure of the diode mounting board, the plug-in type coaxial connectors that make a pair at the connection points with the external circuit formed on both ends of the diode mounting board and the lower conductor plate are fixedly arranged in the conductive connection state. And the diode mounting substrate is fixedly mounted on the lower conductor plate by mutual insertion connection of the pair of coaxial connectors. A diode circuit diode mounting substrate is for a closed circuit.

In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the present invention, the diode mounting board is fixedly mounted without assembly variation by the mutual insertion connection of the coaxial type connector, and the coaxial type connector is Due to the connection rigidity that it has, the displacement movement of the diode mounting substrate after assembly is suppressed and prohibited.

According to a second aspect of the present invention, as a concrete configuration of the coaxial connector in the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the first aspect, the coaxial connector is the diode mounting board. A conductive connection pin fixedly arranged in a conductive connection state at each of the connection points on both ends of the coaxial socket jack into which the conductive connection pin is fixedly arranged in a conductive connection state on the lower conductor plate and into which the conductive connection pin is inserted. It is configured by.

According to a third aspect of the present invention, as a concrete configuration of the coaxial connector in the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the first aspect, the coaxial connector is the diode mounting board. A coaxial type connection pin fixedly arranged in a conductive connection state at each of the connection points of both ends of the, and a coaxial type socket jack embedded in the lower conductor plate in a conductive connection state and inserted with the coaxial type connection pin. It is configured.

The invention according to claim 4 is based on an NRD guide in which a dielectric strip line member is arranged between an upper conductor plate and a lower conductor plate which are vertically arranged in parallel at a predetermined interval. An NRD guide composed of a strip line and a diode mounting substrate which is arranged across the dielectric strip line and constitutes a diode circuit. Connection of a diode mounting substrate in a diode circuit.
In the mounting structure, a predetermined depth a '(where a'<is formed by cutting a dielectric strip line material having a height dimension a and a width dimension b across the dielectric strip line material.
Due to the slit-shaped groove of a), the height h and the width b ′ (however b ′) corresponding to (aa ′) are formed in the lower part of the dielectric strip line material.
≦ b), a saddle portion is formed, and a depth d corresponding to the height h and a width w corresponding to the width b ′ are formed at the lower edge portion of the diode mounting substrate.
A notch-shaped notch recess is formed, and the notch recess is fitted and engaged with the saddle portion by being inserted into the slit-shaped groove of the diode mounting substrate, whereby the diode mounting substrate is with respect to the dielectric strip line material. It is positioned and arranged.

In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the present invention, the diode is formed by the fitting engagement between the notched concave portion of the diode mounting board and the saddle portion of the slit-shaped groove portion of the dielectric strip line material. The mounting board is positioned with respect to the dielectric strip line material without including assembly variations, and this fitting engagement prohibits the displacement movement of the diode mounting board after assembly.

According to a fifth aspect of the present invention, in the connection / mounting structure of the diode mounting substrate in the NRD guide diode circuit according to the fourth aspect, the diode mounting substrate has a tie diode at a central portion that contacts the dielectric strip line material. Have, and symmetrically have the electrode pattern portion on both sides,
The depth d of the notch does not exceed the residual width between the electrode pattern portion and the lower edge of the diode mounting substrate.

The invention according to claim 6 is the invention according to claim 4 or 5.
In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit described in (3), the groove width of the slit-shaped groove in the dielectric strip line direction is smaller than the thickness of the diode mounting board, and the diode mounting board has the slit shape. It is pressed into the groove.

[0020]

In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to claim 1, the diode mounting board is positioned and fixed with respect to the dielectric strip line by mutual insertion connection of the coaxial type connectors. The diode mounting substrate is uniformly positioned with high accuracy and mass productivity with no assembly variation included, and this enables mass production of NRD guide diode circuits having predetermined circuit characteristics with good reproducibility.

Further, since the displacement rigidity of the diode mounting substrate after assembly is suppressed or prohibited by the connection rigidity of the coaxial connector, the circuit characteristics do not change due to the positional displacement, and stable circuit characteristics can be obtained. To be

Further, since the diode mounting board is conductively connected to the lower conductor plate by the coaxial type connector, noise does not come in and out of the conductive connecting portion with respect to the lower conductor plate of the diode mounting board, and thereby stable circuit characteristics can be obtained. .

In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the second and third aspects, the coaxial type connector is a combination of the conductive connecting pin and the coaxial type socket jack, or the coaxial type connecting pin and the coaxial type. It is configured by a combination with a socket jack, and the above-described effect in the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the first aspect is accurately obtained.

In the connection / mounting structure of the diode mounting substrate in the NRD guide diode circuit according to the fourth aspect, the notch recess of the diode mounting substrate and the saddle portion of the slit-shaped groove portion of the dielectric strip line material are fitted and engaged with each other. Since the diode mounting board is positioned with respect to the dielectric strip line material, the diode mounting board is uniformly positioned with high accuracy and mass productivity without any variation in assembly, thereby having predetermined circuit characteristics. The NRD guide diode circuit can be mass-produced with good reproducibility.

Further, this fitting engagement prohibits the displacement movement of the diode mounting substrate after assembly, so that the circuit characteristics do not change due to the positional displacement, and stable circuit characteristics can be obtained.

In the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the fifth aspect, the depth of the cutout recess of the diode mounting board is the residual between the electrode pattern portion and the lower edge of the diode mounting board. Since the width does not exceed the width, the cutout recess does not damage the electrode pattern portion, the circuit characteristics do not change due to the cutout recess, and the NRD guide diode circuit having predetermined circuit characteristics can be mass-produced with good reproducibility. become.

In the structure for connecting and mounting the diode mounting board in the NRD guide diode circuit according to the sixth aspect, the groove width of the slit-shaped groove in the dielectric strip line direction is smaller than the thickness of the diode mounting board, and the diode mounting board is Since it is press-fitted into the slit-shaped groove, no gap is created between the dielectric strip line material and the diode mounting substrate due to the temperature cycle, and the circuit characteristics do not change due to the temperature cycle.

[0028]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of a connection / mounting structure of a diode mounting substrate in an NRD guide diode circuit according to the present invention.

The diode mounting substrate 1 has a pair of electrode pattern portions 3 formed by etching on one surface portion (front surface) of the dielectric substrate 2 in the same manner as the conventional one. The lead diode 4 is mounted.

Connection points 5 for connecting to an external circuit are formed at both ends of the diode mounting substrate 1, and conductive connection pins 6 on the male side of the coaxial connector are conductively connected to each of the connection points 5. It is fixedly installed in the state. The conductive connecting pin 6 has a required rigidity and is formed in a downward hook shape.

On the lower conductor plate 102, the coaxial socket jack 7 which is the female side of the coaxial connector is fixedly mounted. The coaxial socket jack 7 has an outer conductor portion and has a socket shape into which a conductive connection pin is inserted, and is arranged at a position corresponding to each of the conductive connection pins 6.

In the connection / mounting structure of the diode mounting board in this NRD guide diode circuit, the coaxial type socket jacks are provided by mutually inserting the coaxial type connectors, that is, the conductive connecting pins 6 at both ends of the diode mounting board 1, respectively. The diode mounting board 1 is mechanically fixedly mounted on the lower conductor plate 102 and electrically connected at the same time by inserting it into the diode 7, and the diode circuit of the diode mounting board 1 becomes a closed circuit.

As a result, the diode mounting board 1 is fixedly mounted on the lower conductor plate 102 without any variation in assembly, and the diode mounting board 1 is uniformly positioned with high accuracy and mass productivity. As a result, NRD guide diode circuits having predetermined circuit characteristics can be mass-produced with good reproducibility.

Further, since the displacement rigidity of the diode mounting substrate 1 after assembly is suppressed or prohibited by the connection rigidity of the coaxial type connector, the circuit characteristics do not change due to the positional displacement, and stable circuit characteristics are obtained. can get.

Further, since the diode mounting board 1 is conductively connected to the lower conductor plate 102 by the coaxial type connector, there is no noise in and out from the conductive connection portion with respect to the lower conductor plate 102 of the diode mounting board 1, and thus a stable circuit is provided. The characteristics are obtained.

FIG. 2 shows a second embodiment of the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the present invention.

In this embodiment, the coaxial mounting pin 8 forming the male side of the coaxial connector is fixedly mounted downward on the diode mounting board 1, and the coaxial socket jack 9 is embedded in the lower conductor plate 102 in a conductive connection state. It is arranged.
The coaxial type connecting pin 8 is conductively connected to the connecting point 5 by a short lead wire 8a.

Also in this embodiment, the diode mounting board 1 is mechanically fixedly mounted on the lower conductor plate 102 by inserting the coaxial connection pins 8 at both ends of the diode mounting board 1 into the corresponding coaxial socket jacks 9. At the same time, it is electrically connected and the diode circuit of the diode mounting substrate 1 becomes a closed circuit.

As a result, also in the second embodiment, the same effect as that of the first embodiment can be obtained.

3 to 5 show the NRD guide according to the present invention.
Embodiment 3 of the connection / mounting structure of the diode mounting board in the diode circuit is shown.

In this embodiment, the slit-shaped groove 10 is formed in the dielectric strip line member 103 by cutting. In the dielectric strip line material 103 having the height dimension a and the width dimension b, the depth a ′ of the slit-shaped groove 10 is smaller than the height dimension a of the dielectric strip line material 103,
That is, when a ′ <a, the saddle portion 11 having the height h and the width b ′ (where b ′ ≦ b) corresponding to (aa ′) is formed in the lower portion of the dielectric strip line member 103 by the slit-shaped groove 10. ing. In this illustrated example, the width b ′ of the saddle portion 11 is equal to the width dimension b of the dielectric strip line member 103.

A cutout recess 12 is formed at the lower edge of the diode mounting substrate 1. The cutout recess 12 is located directly below the electrode pattern portion 3 and has a depth d corresponding to the height h of the saddle portion 11 and a width w corresponding to the width b ′ of the saddle portion 11.

The diode 4 formed on the diode mounting substrate 1 is an NRD guide (dielectric strip line member 10
Positioning in the center of the cross section of 3) maximizes efficiency. Therefore, the residual width s between the electrode pattern portion 3 and the upper edge portion of the diode mounting substrate 1 and between the lower edge portion is s.
Are set to be equal to each other, the teode 4 of the diode mounting substrate 1 is located in the central portion facing the dielectric strip line material 103, and the electrode pattern portions 3 are symmetrically arranged on both sides thereof.

The depth d of the recess 12 is determined by the electrode pattern portion 3
It has a value that does not exceed the residual width s between the lower edge of the diode mounting substrate 1. That is, the maximum value of the depth d is the residual width s. As a result, the electrode pattern portion 3 is formed into the notch recess 12
The cutout recess 12
Does not change the circuit characteristics.

When the depth d of the cutout recess 12 is d = s, the lower edge of the electrode pattern portion 3 comes into direct contact with the upper surface of the saddle portion of the dielectric strip line material 103. 103 so that the dielectric constants of the diode mounting substrate 1 are the same.
3 and the material of the diode mounting substrate 1 need to be set. If the dielectric constants are different, it is limited to d <s.

The area of the electrode pattern portion 3 has an optimum value in terms of circuit characteristics, and the vertical dimension n of the electrode pattern portion 3 is 1/2 of the width dimension b of the dielectric strip line material 103.
Hereinafter, n is set to approximately 0.45b, and the lateral dimension m is 1/2 of the width a of the height a of the dielectric strip line material 103.
It is set as follows. There are remaining portions of equal width between the electrode pattern portion 3 and the upper edge portion of the diode mounting substrate 1 and between the lower edge portion thereof, and the height dimension H of the diode mounting substrate 1 is the dielectric strip line member 103. Based on the premise that the height is equal to the height a, the residual width s at the top and bottom is set to be ⅓ or less of the height a of the dielectric strip line member 103.

The groove width t ′ of the slit-shaped groove 10 in the dielectric strip line direction is smaller than the plate thickness t of the diode mounting board 1, and the diode mounting board 1 is press-fitted into the slit-shaped groove 10.

By this press-fitting, the cutout recess 12 of the diode mounting substrate 1 and the saddle portion 11 of the slit-shaped groove portion of the dielectric strip line member 103 are fitted and engaged, and the fitting mounting causes the diode mounting substrate 1 to be made of a dielectric material. The strip line member 103 is positioned and mounted without variation in assembly.

As a result, the diode mounting board 1 is fixedly mounted on the lower conductor plate 112 without any assembly variation, and the diode mounting board 1 is uniformly positioned with high accuracy and mass productivity. As a result, NRD guide diode circuits having predetermined circuit characteristics can be mass-produced with good reproducibility.

Further, the cutout recess 12 of the diode mounting substrate 1
And the saddle portion 11 of the dielectric strip line member 103 are fitted and engaged to prevent the displacement movement of the diode mounting substrate 1 after assembly, thereby preventing the circuit characteristics from fluctuating due to the positional deviation and stabilizing the circuit characteristics. Is obtained.

Further, since the groove width t ′ of the slit-shaped groove 10 in the dielectric strip line direction is smaller than the plate thickness t of the diode mounting board 1, the diode mounting board 1 is press-fitted into the slit-shaped groove 10, so that the diode mounting board 1 Is prevented from slipping out of the slit-shaped groove 10, and no gap is created between the dielectric strip line material 103 and the diode mounting substrate 1 due to the temperature cycle, and circuit characteristics are prevented from varying due to the temperature cycle. To be done.

Further, the saddle portion 11 and the notch recess 12 are complementary to each other, and by making these shapes asymmetrical, the mounting of the diode mounting substrate 1 on the dielectric strip line member 103 is performed upside down. This is prevented and so-called fool proofing is performed.

The maximum value of the width b'of the saddle portion 11 is the width dimension b of the dielectric strip line member 103, and the width b'may be smaller than the width dimension b as shown in FIG. .

In the NRD guide, the distance between the two conductor plates sandwiching the dielectric strip line material is the vertical direction, but this is for convenience of explanation, and depending on the orientation of the NRD guide, for example, For vertical placement,
The spacing between the two conductor plates may be horizontal,
The coaxial socket jack may be attached to the upper conductor plate, and the present invention can be realized even if the vertical positional relationship is reversed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a connection / mounting structure of a diode mounting board in an NRD guide diode circuit according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of a connection / mounting structure of a diode mounting board in an NRD guide diode circuit according to the present invention.

FIG. 3 is a perspective view showing a third embodiment of a connection / mounting structure of a diode mounting board in an NRD guide diode circuit according to the present invention.

FIG. 4 is a front view of a diode mounting board according to a third embodiment of a connection / mounting structure of a diode mounting board in an NRD guide diode circuit according to the present invention.

FIG. 5 is a plan view of a dielectric strip line member in Embodiment 3 of the connection / mounting structure of the diode mounting substrate in the NRD guide diode circuit according to the present invention.

FIG. 6 is a plan view of a dielectric strip line member in another embodiment of the connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to the present invention.

FIG. 7 is a perspective view showing an NRD guide.

FIG. 8 is a perspective view showing a conventional example of an NRD guide diode circuit.

[Explanation of symbols]

 1 Diode Mounting Board 2 Dielectric Substrate 3 Electrode Pattern 4 Beam Lead Diode 5 Connection Point 6 Conductive Connection Pin 7 Coaxial Socket Jack 8 Coaxial Connection Pin 9 Coaxial Socket Jack 10 Slit-like Groove 11 Saddle 12 Notch 12 101 Upper Conductor Plate 102 Lower Conductor Plate 103 Dielectric Strip Line Material

Claims (6)

[Claims] 1. A dielectric strip line based on an NRD guide in which a dielectric strip line material is arranged between an upper conductor plate and a lower conductor plate which are vertically arranged in parallel at a predetermined interval, and a diode. In a connection / mounting structure of a diode mounting board in an NRD guide diode circuit that is configured by a diode mounting board that is configured to cross the dielectric strip line and is formed at both ends of the diode mounting board. Insertion-type coaxial connectors that make a pair with each other are fixedly arranged in a conductive connection state at a connection point with an external circuit and a lower conductor plate, and the diode mounting board is provided by mutual insertion connection of the coaxial connectors that make a pair. It is fixedly mounted on the lower conductor plate, and the diode circuit of the diode mounting substrate is closed circuit. Connecting and mounting structure of the diode mounting substrate in RD guide diode circuit. 2. The coaxial connector has conductive connecting pins fixedly arranged in conductive connection at the connection points at both ends of the diode mounting board, and fixedly arranged in conductive connection on the lower conductor plate. The connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to claim 1, wherein the connecting / mounting structure is configured by a coaxial type socket jack into which the conductive connection pin is inserted. 3. The coaxial connector is coaxially fixed to the connection points at both ends of the diode mounting board in fixed connection with each other, and embedded in the lower conductor plate in connection with the connection. 2. The NRD guide according to claim 1, further comprising a coaxial socket jack into which the coaxial connection pin is inserted.
Connection / mounting structure for the diode mounting board in the diode circuit. 4. A dielectric strip line based on an NRD guide in which a dielectric strip line member is arranged between an upper conductor plate and a lower conductor plate which are vertically arranged in parallel at a predetermined interval, and a diode. In a connection / mounting structure of a diode mounting board in an NRD guide diode circuit configured by a diode mounting board arranged in a circuit and arranged across the dielectric strip line, a height dimension a and a width dimension b are provided. A slit-shaped groove having a predetermined depth a '(where a'<a) is formed in the dielectric strip line material by cutting across the dielectric strip line material, so that (a-a ') is formed below the dielectric strip line material. A saddle portion having a height h and a width b ′ (where b ′ ≦ b) is formed, and a depth d and a width b ′ corresponding to the height h are formed at the lower edge of the diode mounting substrate. A notch-shaped notch recessed portion of w is formed, and the notch recessed portion is fitted and engaged with the saddle portion by being inserted into the slit-shaped groove of the diode mounting substrate, whereby the diode mounting substrate is attached to the dielectric strip line material. A structure for connecting / mounting a diode mounting board in an NRD guide diode circuit, which is characterized in that it is positioned and arranged. 5. The diode mounting substrate has a taiode at a central portion facing the dielectric strip line member, and electrode pattern portions are symmetrically provided on both sides thereof, and a depth d of the cutout concave portion is the electrode pattern portion. The connection / mounting structure of the diode mounting board in the NRD guide diode circuit according to claim 4, wherein a residual width between the diode mounting board and a lower edge portion of the diode mounting board is not exceeded. 6. The groove width of the slit-shaped groove in the direction of the dielectric strip line is smaller than the plate thickness of the diode mounting board, and the diode mounting board is press-fitted into the slit-shaped groove. 5. A structure for connecting and mounting a diode mounting board in the NRD guide diode circuit described in 5.