JPS5911002A - Waveguide-microstrip line converter - Google Patents

Abstract

PURPOSE:To make the performance at mass production uniform, by inserting a matching element incorporated with an impedance matching plate and a probe conductor rod to a waveguide short-circuited for one end in the direction of transmission via a probe insulator for connecting the element to a strip conductor. CONSTITUTION:The probe matching element 11 incorporated with the impedance matching plate and the probe conductor rod at a position having S=lambdag/4 of electric length from a short-circuit face of waveguide 1, and the probe insulator 12 are inserted into the direction of electric field of the propagated electromagnetic waves of the waveguide 1, and the element 11 and the microstrip conductor 6 are soldered at a conductor connecting section 9. The microwave strip line consists of the conductor 6, the dielectric board 7 and the ground conductor 8, and the conductor 8 is provided along with the waveguide side wall. The element 11 is formed with good dimensional accuracy as shown in figures (a), (b) by means of the punch or etching processing and the folding processing. The insulator 12 is formed with a hollow dielectric substance by fixing a waveguide inserting section 13 of the element 11. Thus, the size and the electric reproducibility are improved, allowing to make the performance at mass production uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a knob line converter (11, waveguide-micros L'); 1. Provides a waveguide-saving microstri-knob line converter having a structure with uniform performance, especially during production. This is what I am trying to do.

The structure of this type of waveguide-to-microstrip line converter is shown in Figure 1, and its cross-sectional view is shown in Figure 2 at 7i', -V.
o This is a globe consisting of a probe conductor rod 3 and a dielectric body O'·l at a fi/position near the short-circuit surface 2 of the waveguide 1 with an electrical length of λ, /4, that is, S−λ, /4. An insulator is inserted in the direction of the electric field of the propagating electromagnetic wave in the waveguide 1, and the conductor connection part 9
- The aforementioned PJ-b conductor bar 3 and the MicroSt.7-b conductor 6 are semi-1.f1 connected at the conductor connection portion 9-b via the impedance matching plate 5 which was soldered at t7 a. .

The microstrip line d1 is composed of a microstrip conductor 6, a dielectric plate, and a ground conductor 8, and the ground conductor 8 is located at a position where it meets the side wall of the waveguide.

The impedance matching plate 5 has the role of performing impedance matching between the globe conductor bar 3 and the microstrip conductor 6, and its dimensions a and b correspond to the impedance of the microstrip line and the waveguide insertion length of the globe conductor bar 3. It varies depending on the target diameter of the S1 globe conductor 3 in front of the vehicle above the short-circuit surface 2 and the dielectric strength of the globe insulator, and is determined experimentally.

By the way, the electric waveguide-microstrinob converter 4
/1 Performance Q'1, expressed as VSWR. In other words, it is good that the VSWR is close to 1 over a wide frequency band. Third
The figure and FIG. 4 are examples of conversion characteristics between a microstrip line of 1'1 impedance 50Q and made of 7 dielectric plates or a defrono board using a 12 GHz band waveguide. Figure 3 shows the dimensions S = 6111111a = 4m
A special 1/1 example is shown with m and b being 3 mm and the insertion length of the globe conductor rod 3 as a parameter. Also, Figure 4 (
G1, S:=6 mm, L==4 mm
, b = 3 mm, and the length a of the impedance matching plate 5 is used as a parameter.

From the example above, it can be seen that the VSWRi properties of a waveguide-microstrip line converter are greatly influenced by the dimensions of the constituent parts. If required, at least the insertion length of the probe conductor and the length of the impedance matching plate a (17, l, sufficiently smaller than 1 ram) method accuracy is required.
Width b1 Probe insulator = J method and variation f of dielectric constant ε, etc.
It can be inferred from the above characteristic examples that the χJ method similarly has a large effect on the VSWR % and requires the same accuracy and uniformity of the χJ method, and in fact has a large effect.

However, in the structure according to the conventional example, even if the accuracy of the [chi] method of each constituent component is good, there will be a distribution in assembly at the conductor connection portion 9-a. In other words, the length of the glove insertion is uneven, the conductor connection part 9-a is affected by the overlaying of the conductor connection part 9-a, and the area near the solder A-1 is affected by the thermal deformation of the glove insulator due to the heat during soldering. This has the effect of changing the distributed capacitance of the impedance matching plate, resulting in the same effect as when changing the . ``!, / Coglobe insulators are made of heat-resistant materials such as polyethylene and polystyrene because they have good processability.

The present invention aims to eliminate the above-mentioned drawbacks and provide a waveguide-to-microstrip line converter having a structure that has reproducibility of VSWR characteristics, that is, mass production. 1 and 2 are the same as those in FIGS. 1 and 2, and the same numbers are used to omit the explanation.

Waveguide-microstrip conversion according to the present invention? ■１
1.By using the impedance matching plate 6 and the globe matching element 11, which is made from the globe conductor rod 3 or the conductor 4, it is possible to reduce the number of connection parts. It has a structure with improved dimensions and electrical reproduction 1<1. 3. Figure 5 U; 1 is an embodiment of the present invention. As shown in Figure 1, the impedance matching plate and block 1-F conductor rod 4,
It is replaced by a globe matching element 11, and a probe insulator d made of a hollow dielectric is fixed to the waveguide wall.

As shown in FIGS. 6a and 6b, the probe matching element 11 is manufactured with high dimensional accuracy by punching, etching, and simple bending. The globe insulator 12 fixes the waveguide insertion part 13 of the globe matching element 11, and is a hollow dielectric body having a circular or square guide hole in the center.

In the assembly work of the embodiment of the present invention, since the soldering work of the globe conductor rod is eliminated, the 1' method and electrical reproducibility are very high, and the structure is suitable for use and productivity. .

Figure 71. VSWF (characteristics shown) of the waveguide slip I/rip line converter according to the same example, 11.3 GHz
VSWRl at ~12.6GHz. A good performance of 25 or less has been obtained.

FIG. 8 shows a second embodiment in which the globe matching element 11 is connected to the curved globe conductor rod 14 and the impedance matching plate 5 by connecting them with each other.

In order to avoid thermal deformation of the probe insulator 4,
The desired purpose can be achieved by connecting the probe conductor with an impedance matching plate, but since the impedance matching plate extends in the opposite direction to the microstrip line, it is difficult to connect the probe conductor with barbs. stick 1
4 needs to be longer than the first embodiment.

As described above, the waveguide-to-microstrip converter according to the present invention has no deterioration in performance due to imperfections and can be provided at low cost.

[Brief explanation of drawings]

Figure 1 Sea 1. 11 is a perspective view of a conventional waveguide-to-microwave line converter, FIG. 2 is a cross-sectional view thereof, and FIG.
Fig. 4 is a characteristic diagram of the i+- time converter, Fig. 6 is an i-plane view of the waveguide-microstrinob line converter in an embodiment of the present invention, Fig. 6 &-, 1, A perspective view of the probe matching element r of the same converter for explanation, FIG.
, Figure 1/1 of the actual example, and Figure 8 are the same (actual M1 of 1μ
FIG. 3 is a torso view of an example globe matching element. 1 Waveguide, 4... With blow 7-li, 5... Impedance! 1 go 4 anti, 6- Micros j-IJ
,. Conductor, 11・Globe matching element, °3・-・4 wave tube insertion part, 14・Tsubai・1 brochure conductor rod, 9・
Conductor connection. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2, Figure 3)

Claims (2)

[Claims] (1) Insert a globe insulator and a globe insulator in which an impedance matching plate and a probe conductor rod are integrated into a waveguide wired in the transmission direction. Insert the probe insulator provided on the side of the waveguide 7
A waveguide-to-mark loss strip line converter comprising a microstrip conductor of a microstrip line to which a hole is to be fixed, and a loop matching element connected to the microstrip conductor. (2) The waveguide-to-micros lip line converter according to claim 1, which has a brochure matching element formed by joining a globe conductor rod having a flange portion and an impedance matching plate.