JPH09219608A - Nrd guide circuit element and positioning and fixing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely and inexpensively manufacture a circuit element by a comparatively simple constitution. SOLUTION: This circuit element is used in a microwave millimeter wave band, a dielectric line is formed inside the upper and lower conductive plates arranged in parallel at the space of a half-wave length of the free space wavelength of a frequency to be used and an NRD guide circuit in which a signal is transmitted along this dielectric line is composed. At this time, at the center location which is perpendicular to the lower side conductive plate 2 within a dielectric strip 20 composing the dielectric line and is in a width direction, a conductive pin 22 in which the length S1 along a signal transmission direction is 1/4 of the wavelength between dielectric lines of a transmission mode or below is arranged by the pitch P1 which is 1/4 of the wavelength between the dielectric lines of the transmission mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NRD guide (No.
n Radiative Dielectric Wave Guide: A circuit element that constitutes an NRD guide circuit using a non-radiative dielectric line, for example, a circuit element such as an unnecessary mode suppressor, a non-reflecting terminator, an attenuator, an NRD guide matching line, and a method for positioning and fixing the circuit element. .

[0002]

2. Description of the Related Art Conventionally, as the NRD guide circuit,
As shown in FIG. 12, an upper conductor plate 1 and a lower conductor plate 2 which are both flat plates are arranged in parallel with each other, and a dielectric line is formed between the conductor plates 1 and 2, for example, PTF.
It is generally known that a dielectric strip 3 made of fluororesin such as E is interposed.

Here, the distance a between the upper and lower conductive plates 1 and 2 is
Is the free space wavelength of the frequency used, λ ₀ ,
This is set to a half wavelength or less _{(a ≦ λ 0/2)} , further the width b of the dielectric strip 3 is preferably a substantially equal to the half wavelength (b ≒ λ _0/2) are set.

This is because when the plate spacing of the parallel plate waveguide is less than a half wavelength of the frequency used, electromagnetic waves of polarized waves parallel to the wall surface are blocked and cannot propagate, but if a dielectric strip is inserted into this. , The electromagnetic wave is propagated along the strip, and the radiated wave is completely suppressed by the blocking effect of the parallel plate waveguide which is also the housing.

As the frequency band to be used, the millimeter wave band in which the dielectric line is sufficiently small and the transmission loss of the printed line increases is suitable. The transmission mode of this type of NRD guide includes the LSM mode in which the magnetic field is parallel to the boundary between the dielectric strip 3 and the air as shown in FIG. 13 (a), and the magnetic field is in the conductor as shown in FIG. 13 (b). It is roughly divided into the LSE mode parallel to the plates 1 and 2. Both of these modes are non-radiative and can coexist in the NRD guide, but the LSM mode is selected as the operation mode from the viewpoint of low loss.

Therefore, in order to block the LSE mode, for example, as shown in FIG. 14, an unnecessary mode suppressor 6 formed by embedding a conductor foil 4 having a comb pattern in the end of the dielectric strip 3 is an NRD guide circuit. It is used as a circuit element.

In this unnecessary mode suppressor 6, for example, as shown in FIG. 15, a conductor foil 4 formed in a predetermined comb pattern by etching is attached to a dielectric strip 3.
A pair of block constituent members 5a constituting the block 5 of
5b is sandwiched from the front and back sides, and these are fused and integrated, and then machined to form a predetermined shape.

Here, as shown in FIG. 16, the width b of the dielectric strip 3 of the unwanted mode suppressor 6 is b /.
When the conductor plate 7 is arranged at two positions, the electric field that can exist is LS.
Only in M mode, LSE mode is completely cut off. However, as shown in the figure, when the conductor plate 7 is in contact with the upper and lower conductor plates 1 and 2, transmission loss occurs.

[0009] Therefore, the conductor foil 4, not in contact with the upper and lower conductor plates 1 and 2, and each section length S of the comb to suppress TEM mode, here S ≒ λg _0/4, λg ₀ = λ ₀ / (εr) ^1/2 , εr: Roughness with relative permittivity is provided.

In the NRD guide circuit element, as shown in FIG. 17 (a), the dielectric strip 3 is divided into two along the E plane parallel to the upper and lower dielectric plates 1 and 2, and, for example, a plane is formed there. After inserting the NiCr film 8 with a resistance of 500Ω,
NR made by again bonding the dielectric strips 3 together
D guide non-reflective terminator 9 or, as shown in FIG.
An NRD guide in which two ferrite disk resonators 10 are closely adhered to the upper and lower conductor plates 1 and 2, and a dielectric strip 3 in which the unwanted mode suppressor 6 is integrally connected to the end is connected to the ferrite disk resonators 10. Circulator 11,
Further, as shown in FIG. 7C, a dielectric strip 3 in which a Gunn diode 15 is fixed together with a bias line 14 to a metal block 13 also serving as a heat sink, and the unnecessary mode suppressor 6 is integrally connected to an end portion thereof. NRD guide gun oscillator 16 in which is connected to the gun diode 15
Etc.

[0011]

However, in the conventional unnecessary mode sub dresser, there are various problems in manufacturing the undesired mode sub dresser, and the yield is considerably low and the price is very high. It was the current situation.

That is, when arranging the conductor foil in a skewered pattern before being fused and integrated with the block of the dielectric strip in order to manufacture the unnecessary mode suppressor, since the pattern shape is complicated, the adjacent patterns are adjacent to each other. The entanglement with each other causes pattern bending and wrinkles, which is why
Not only is it difficult to arrange the patterns in parallel and at regular intervals, but even if the patterns are arranged well, the patterns are bent during fusion and integration.

Moreover, since the conductor foil having the skewered pattern is covered with the dielectric block and cannot be seen from the outside, the dimensional accuracy is high in the state where the reference foil pattern is not visible when machining this integrated product. This work was extremely difficult because it needed to be cut out.

For this reason, for example, as shown in FIG. 18A, the conductor foil 4 in the skewed pattern inside the finished dielectric block 5 (dielectric strip 3) is inclined at an angle θ with respect to the center line. Then, the protruding portions A ₁ and A ₂ of the conductor foil 4 to the outside of the unnecessary mode suppressor 6 are generated, or the conductor foil 4 is located above or below the center line as shown in FIG. There was a tendency that abnormal spaces B ₁ and B ₂ and protruding portions C ₁ and C ₂ out of the unnecessary mode suppressor 6 of the conductor foil were generated by shifting by the width g.

When the unnecessary mode suppressor thus constructed in the form shown in FIGS. 18 (a) and 18 (b) is used,
Not only the original purpose, that is, the main mode (LSM mode), but also other unnecessary modes (LSE, TEM, etc.) cannot be suppressed sufficiently, but on the contrary, the unnecessary modes are promoted or the passage loss is significantly increased. .

In view of the above, the present invention provides an NRD guide circuit element such as an unnecessary mode suppressor with a relatively simple structure.
It is an object of the present invention to provide a product that can be manufactured with high accuracy and at low cost and that can be fixed to a predetermined position with high accuracy.

[0017]

An NRD guide circuit element according to the present invention is used in a microwave millimeter wave band, and upper and lower conductor plates are arranged in parallel at intervals of half a wavelength or less of a free space wavelength of a frequency to be used. In an NRD guide circuit element forming an NRD guide circuit in which a dielectric line is formed inside and a signal is transmitted along the dielectric line, the upper and lower conductor plates in a dielectric strip forming the dielectric line. The length along the signal transmission direction is 1/4 of the wavelength between the dielectric lines in the transmission mode, which is perpendicular to the center and in the width direction.
The following conductor pins are arranged at a pitch of ¼ or less of the wavelength between the transmission mode dielectric lines.

Here, a connection pin portion for press-fitting the lower conductor plate may be exposed to the outside of the dielectric strip and integrally connected to the lower end of the conductor pin. Further, the positioning and fixing method of the NRD guide circuit element according to the present invention is N
A recessed hole for press-fitting a conductor pin is provided at a predetermined position of the lower conductor plate corresponding to the conductor pin at a fixed position with respect to the lower conductor plate of the RD guide circuit element, and the connection pin portion of the conductor pin is press-fitted into this recessed hole. Characterize that.

Further, another method for positioning and fixing the NRD guide element is to connect the connecting pin portion of the conductor pin to a predetermined position of the lower conductor plate corresponding to the conductor pin at a fixed position with respect to the lower conductor plate of the NRD guide circuit element. It is characterized in that it is fixed and a dielectric strip is inserted into this conductor pin.

[0020]

According to the NRD guide circuit element of the present invention constructed as described above, the NRD guide circuit element can be installed by a comparatively simple operation such as press-fitting the rod-shaped conductor pin into a predetermined position inside the dielectric strip. The circuit element can be manufactured accurately and inexpensively.

According to the method for positioning and fixing the NRD guide circuit element, the positioning of the NRD guide circuit element with respect to the lower conductor plate is provided in advance on the connection pin portion of the conductor pin fitted inside and the lower conductor plate. Through the recessed hole I made,
Alternatively, it can be fixed to the lower conductor plate with high positional accuracy by performing through the conductor pins and the dielectric strip itself which are solidified in advance on the lower conductor plate.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention applied to an unnecessary mode suppressor as an NRD guide circuit element. In this embodiment, a dielectric line is formed between upper and lower conductor plates to form a dielectric line. A block 20 is provided which forms part of the body strip.

The block 20 is formed of a fluororesin such as PTFE in a rectangular cross section, and its height a is equal to the free space wavelength λ of the frequency to be used.
₀ the time, this is set to a half wavelength or less _{(a ≦ λ 0/2)} , The inside of the predetermined position, the through-hole 21 is provided penetrating vertically. Then, the unnecessary mode suppressor 23 is configured by fitting a plate-bar-shaped conductor pin 22 made of a metal such as copper or aluminum into the through hole 21 by press fitting or the like.

That is, the inner shape of the through hole 21 of the block 20 is the same as the outer shape of the conductor pin 22 or is formed in a rectangular shape having a slightly smaller cross section.
The unnecessary mode suppressor 23 is configured by simply press-fitting the conductor pin 22 therein.

When the conductor pin 22 is press-fitted until its upper surface is flush with the upper surface of the block 20, the conductor pin 22 is formed so that the connection pin portion 24 exposed to the outside is formed at the lower end of the conductor pin 22. The length of 22 is equal to that of the block 20.
Is set longer than the height of.

On the other hand, a concave hole 25 for press-fitting a conductor pin is provided at a position of the lower conductor plate 2 where the unnecessary mode suppressor 23 is fixed and which corresponds to the conductor pin 22.
As a result, as described above, the conductor pin 22 is press-fitted into the block 20, and then the connection pin portion 24 at the lower end of the conductor pin 22 is press-fitted into the recessed hole 25. It can be positioned and fixed to the plate 2.

Here, the conductor pin 22 is the block 2
It is located at the center of 0 in the width direction and is arranged vertically to the lower conductor plate 2, and has a length S along the signal transmission direction.
₁ and the pitch P ₁ between the conductor pins are 1/4 or less of the wavelength λg of the LSM between the dielectric strips (S ₁ ≦ λg / 4, P
₁ ≤ λg / 4), respectively.

With this setting, unnecessary modes (LSE mode, TEM mode, etc.) other than the main mode (LSM mode), which is the purpose of the main body, can be suppressed.

Then, as shown in FIG. 2, for example, other NRD guide circuit elements 26 and 27 are arranged in series before and after the unnecessary mode suppressor 23 to form the dielectric strip 3.

Here, it is practically preferable that the thickness t of the conductor pin 22 is 1/3 or less of the width b of the block 20 (t ≦ b / 3).

It should be noted that the conductor pin 22 is not provided in advance inside the block 20 of the dielectric strip, and the through hole 21 is provided therein.
May be press-fitted into the block 20 to form the unnecessary mode suppressor 23. Alternatively, first, the conductor pin 22 is fixed to a predetermined position of the lower conductor plate 2 via the connecting pin portion 24 at the lower end thereof. Alternatively, the block 20 of the dielectric strip may be inserted into the conductor pin 22 to configure the unnecessary mode suppressor 23, and at the same time, the positioning and fixing may be performed.

Further, as shown in FIG. 4A, the length of the conductor pin 22a is set to be the same as the height of the block 20, and the end portion of the conductor pin 22a is not exposed to the outside so that uniform performance can be obtained. It is possible to obtain the unnecessary mode suppressor 23a and attach it to the lower conductor plate 2 as shown in FIG.

FIG. 5 and FIG. 6 show another embodiment, in which this embodiment extends a dielectric strip 3 extending in an elongated shape.
A through hole 21a having a circular cross section is provided at a predetermined position of the end portion of the, and a cylindrical conductor pin 22b is provided at the through hole 21a.
The undesired mode suppressor 23b is press-fitted into a to form the unnecessary mode suppressor 23b, and the conductor pin 2 is provided at a predetermined position on the lower conductor plate 2.
A concave hole 25a having a shape of 2b is provided.

Here, the conductor pin 22a is located at the center in the width direction of the dielectric strip 3 and is arranged vertically to the lower conductor plate 2, and its diameter φ and the pitch P ₂ between the conductor pins are set. Are set to 1/4 or less (φ ≦ λg / 4, P ₂ ≦ λg / 4) of the wavelength λg of the LSM between the dielectric strips.

Here, the diameter φ of the conductor pin 22a is
1/3 or less of the width b of the dielectric strip 3 (φ ≦ b / 3)
Is practically preferable. This embodiment is based on FIG.
7, a non-reflective terminator, an NRD guide circulator,
It is also effective for other NRD guide elements such as NRD guide gun oscillator.

As shown in FIG. 7A, the elliptical shape
Use the conductor pin 22c of the
Position in the widthwise center of the block 20 perpendicular to the lower conductor plate
And the length S along the signal transmission direction.
_TwoAnd pitch P between conductor pins _ThreeBetween the dielectric strips
1/4 or less of the LSM wavelength λg (S_Two≤ λg / 4, P
_Three≤ λg / 4) and suppress unnecessary modes
Or as shown in FIG.
Use a conductor pin 22d with a polygonal cross section such as a prism,
Lower side in the widthwise center of the block 20 of the dielectric strip
Place it in a position perpendicular to the conductor plate and
Diameter φ₁And pitch P between conductor pins_FourThe dielectric strip
1/4 or less of the LSM wavelength λg between₁≦ λg /
4, P_Four≤ λg / 4) respectively and set unnecessary mode
The presser 23d can also be configured.

Each unnecessary mode suppressor 23, 23
Since a, 23b, 23c, and 23d contact the lower conductor plate 2 (and the upper conductor plate 1) at the upper and lower ends thereof, it seems to be disadvantageous in terms of transmission loss. However, since the conductor pins are in contact with the upper and lower conductor plates in a small area, the conventional example (FIG. 8A) and the embodiment shown in FIGS. 4 and 5 (FIG. 8B) are shown in FIG. As shown in the comparison of millimeter wave characteristic examples of the unwanted mode suppressor of
The original low loss property of the D-guide transmission line is not significantly impaired.

Rather, considering the uniformity, handleability, mass productivity, etc. in the actual manufacturing and assembling, the structure of the unnecessary mode suppressor of the present invention is significantly effective for cost reduction. Next, a manufacturing method of the embodiment shown in FIGS. 1 to 3 and the embodiment (unnecessary mode suppressor) shown in FIG. 4 will be described with reference to FIG.
This will be described with reference to FIG.

First, as shown in FIG.
By machining a flat plate-shaped dielectric sheet 30 formed of a fluororesin such as TFE to a predetermined thickness, through holes 21 having the same shape as or slightly smaller than the conductor pins 22 or 22a are formed at regular intervals. . When the unnecessary mode suppressor 23 of the embodiment shown in FIGS. 1 to 3 is manufactured, as shown in FIG.
In the case of manufacturing the unnecessary mode suppressor 23a of the embodiment shown in FIG. 4, the conductor pin 22 having a length longer than the height of 1 is equal to the height of the through hole 21 as shown in FIG. The conductor pin 22a having a length is press-fitted into each through hole 21. Then, by cutting the dielectric sheet 30 into a predetermined size, the unnecessary mode suppressor 23 of the embodiment shown in FIG. 1 to FIG. 3 or the unnecessary mode suppressor 23 shown in FIG. As shown, the unnecessary mode suppressor 23a of the embodiment shown in FIG. 4 is manufactured.

FIG. 10 shows another manufacturing method. This method forms a rectangular parallelepiped block 31 shown in FIG. 10A or a cylindrical block 32 shown in FIG. After forming the through holes 21 in the blocks 31 and 32, conductor pins 22d having the same length as or longer than the thickness of the blocks 31 and 32 are press-fitted into the through holes 21, and the blocks 31 and 32 are sliced. By applying
As in the case of FIG. 9, the unnecessary mode sub-lesser is manufactured.

FIG. 11 shows an example of manufacturing the round rod-shaped conductor pin 22b used in the embodiments of FIGS. 4 and 5. As this type of round bar-shaped conductor pin 22b, a commercially available one can be used as it is. For example, when a round bar-shaped conductor having a diameter matching the shape of the conductor pin 22b is not commercially available, the same figure is used. As shown in FIG.
After forming into a specified outer diameter dimension by drawing in using No. 5, a conductor pin having a desired outer diameter and a desired length can be obtained by cutting into a specified length.

This can be similarly produced for other shapes such as an elliptical bar shape, a flat plate shape, a regular polygonal column shape, etc. by using a die suitable for each shape.

The conductor pin as described above can be manufactured much more easily than the conductor foil having the skewered pattern in the conventional example, and its handling is easy without the pattern being entangled.

[0044]

As described above, according to the present invention, an NRD guide circuit element such as an unnecessary mode suppressor can be provided with a relatively simple structure in which a conductor pin is press-fitted in a dielectric strip. Therefore, it is possible to reduce the manufacturing and assembling cost and to manufacture at low cost a highly accurate product in which variations in the manufacturing characteristics are made uniform.

Moreover, according to the positioning and fixing method of the NRD guide circuit element of the present invention, each circuit element can be accurately fixed to the predetermined position of the lower conductor plate, and therefore a large number of the same circuit devices are manufactured. However, there is an effect that the variation in the manufacturing and assembling characteristics can be made uniform.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing a state of being attached to a lower conductor plate.

FIG. 3 is a plan view similarly.

FIG. 4 is a front view showing another embodiment.

FIG. 5 is an exploded perspective view showing still another embodiment.

FIG. 6 is a plan view of the same.

FIG. 7 is a plan view showing still another embodiment different from each other.

FIG. 8 is a graph showing a characteristic example of an unnecessary mode suppressor according to the present invention and a conventional example.

FIG. 9 is a diagram showing a manufacturing example of the embodiment shown in FIGS. 1 to 3 and 4;

FIG. 10 is a view showing another example of manufacture in the same manner.

11 is a perspective view showing a manufacturing example of the conductor pin used in the embodiment shown in FIG.

FIG. 12 is a perspective view showing an NRD guide circuit.

FIG. 13 is an electric field distribution map of LSM mode and LSE mode.

FIG. 14 is a partially cutaway perspective view showing a conventional unnecessary mode suppressor.

FIG. 15 shows a manufacturing example thereof, and FIG.
The perspective view before fusion-integration, the figure (b) is a perspective view after fusion-integration, and the figure (c) is the sectional view.

FIG. 16 is a sectional view for explaining the principle of an unnecessary mode suppressor.

FIG. 17 is a perspective view showing different NRD guide circuit elements.

FIG. 18 is a cross-sectional view for explaining a defect of a conventional unnecessary mode suppressor.

[Explanation of symbols]

1 Lower Conductor Plate 2 Upper Conductor Plate 3 Dielectric Strip 20 Blocks (Dielectric Strip) 21,21a Through Holes 22, 22a, 22b, 22c, 22d, 22e Conductor Pins 23, 23a, 23b, 23c, 23d Unwanted Mode Suppressor 24 Connection pin 25, 25a Recessed hole

Front Page Continuation (72) Inventor Jun Hirayama 232-1 Tanasawa, Atsugi City, Kanagawa Prefecture, Japan Barker Industrial Co., Ltd. In the company

Claims (4)

[Claims] 1. A dielectric line is formed inside upper and lower conductor plates which are used in a microwave millimeter wave band and are arranged in parallel at intervals of half a wavelength or less of a free space wavelength of a frequency to be used. In an NRD guide circuit element that constitutes an NRD guide circuit in which a signal is transmitted along a signal line, the signal transmission is performed at a central position in the width direction that is perpendicular to the upper and lower conductor plates in the dielectric strip that constitutes the dielectric line. A conductor pin whose length along the direction is 1/4 or less of the wavelength between the transmission mode dielectric lines is set to 1/4 of the wavelength between the transmission mode dielectric lines.
An NRD guide circuit element characterized by being arranged at the following pitches. 2. The NR according to claim 1, wherein a connection pin portion for press-fitting a lower conductor plate is exposed to the outside of the dielectric strip and integrally connected to the lower end of the conductor pin.
D guide circuit element. 3. A recess hole for press-fitting a conductor pin is provided at a predetermined position of the lower conductor plate corresponding to the conductor pin at a fixed position with respect to the lower conductor plate of the NRD guide circuit element, and the conductor pin is connected in the recess hole. The method for positioning and fixing the NRD guide element according to claim 2, wherein the pin portion is press-fitted. 4. A connection pin portion of a conductor pin is fixed to a predetermined position of a lower conductor plate corresponding to a conductor pin at a fixed position with respect to the lower conductor plate of an NRD guide circuit element, and a dielectric strip is attached to this conductor pin. The NRD guide element positioning and fixing method according to claim 2, wherein the NRD guide element is inserted and inserted.