JPS60192402A - Waveguide-microstrip line converter - Google Patents

Abstract

PURPOSE:To decrease the skin effect of a wall face current by adhering closely a thin metallic plate with low loss to a supporting metallic plate cross section exposed to a waveguide wall so as to decrease the skin resistance of the waveguide wall. CONSTITUTION:A skin metallic plate 15 inserted between terminated rectangular waveguides split into two whose one end is placed between a supporting metallic plate 7 and a ground conductor 5 of a dielectric substrate 6 and whose other end is placed between the supporting metallic plates 7 is adhered closely to the supporting metallic plate 7. The type of material of the skin metallic plate 15 is a material with high conductivity and low loss, e.g., a copper plate having a thickness of 30mum. The skin resistance of the waveguide wall of the waveguide- microstrip line converter is decreased independently of the type of material of the supporting metallic plate 7 by using the skin metallic plate 15 so as to decrease the conversion loss. Then the waveguide-microstrip line converter with low conversion loss is obtained with inexpensive and simple constitution.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a waveguide-micros I-IJ that converts a waveguide mode signal into a microstrip line mode signal.
The present invention relates to the structure of a tube line converter.

[Background of the invention]

FIG. 1 shows the configuration of a conventional waveguide-to-microstrip line converter. Dielectric substrate 60 with ground conductor 5 on the back side
A strip conductor 4 is formed on the surface, and the strip conductor 4
A T-shaped line 8 with an open end having a length of about 1/2 wavelength of the desired frequency is formed on one side of the line, and a support metal plate 7 is closely attached to the ground conductor 5. From the terminal short-circuited rectangular waveguide 1.2 divided into two in parallel to the direction of radio wave propagation at the center of the H plane, either the terminal short-circuited T-shaped line 8 or the short-circuited surface 9 of the terminal short-circuited rectangular waveguide 1.2 divided into two is used. The dielectric substrate 6 and the supporting metal plate 7 are rubbed so that they are vertically installed at the center of the H plane of the short-circuited rectangular waveguides 1 and 2 at a desired distance of approximately 1/4 wavelength in the tube. Therefore, on the tube wall on the short-circuit surface 9 side of one end 1 of the terminal short-circuit rectangular waveguide and on the tube wall on the side from which the IJ tube conductor is drawn out, there is a protrusion 2 having the same height as the thickness of the dielectric substrate 6.
1 is formed, and a groove 20 through which the protrusion 21 passes is formed in the dielectric substrate 6 at a position corresponding to the protrusion 21,
The supporting metal plate 7 and the terminal short-circuited waveguide 1 are closely attached. At this time, the ground conductor 5 and support metal plate 7 inserted into the terminal short-circuited rectangular waveguides 1 and 2 are removed, and the terminal short-circuited rectangular waveguide 1 is inserted into the terminal short-circuited waveguide 1 at the part where the strike IJ tube conductor and the terminated short-circuited waveguide 1 contact. A groove 12 is formed in the waveguide 1 . A waveguide-to-microstrip line converter with this structure can be constructed integrally with a planar circuit or a support metal plate, which has a microstrip line as its basic structure, and is structurally sound. Micros) It is often used because it can convert into IJ tube line mode signals. However, in the above structure, the cross section 22 of the support metal plate 7 is exposed to the wall of the waveguide of the waveguide-microstrip line converter, and the support metal plate 7 is required to be made of a strong material. An iron plate is used. As a result, the skin resistance of the waveguide increases, the skin loss of the wall current increases, and the conversion characteristics deteriorate.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a waveguide-to-microstrip line converter that is inexpensive, has a simple configuration, and provides stable conversion characteristics with low conversion loss.

[Summary of the invention]

The present invention provides a low-loss, thin metal plate that closely adheres to the cross section of the support metal plate exposed on the waveguide wall of a waveguide-to-microsto IJ tube line converter. The present invention aims to obtain a waveguide-microst IJ tube line converter with low loss and stable conversion characteristics by reducing the skin resistance and the skin loss of wall current.

[Embodiments of the invention]

An embodiment of the invention is shown in FIG. The same numbers as in FIG. 1 indicate the same parts.

In a conventional waveguide-to-microstrip line converter, one end is located between the support metal plate 7 and the ground conductor 5 of the dielectric substrate 6, and the other end is located between the support metal plate 7 and the support metal plate 7 side. The skin metal plate 15 inserted between the terminated short-circuited rectangular waveguides 20 is closely attached to the support metal plate 7. The material of the skin gold ingot plate 15 is a material with high conductivity and low loss, such as a copper plate with a thickness of about 30 μm. With this skin metal plate 15, the skin resistance of the waveguide tube wall of the waveguide-microst IJ tube line converter can be reduced regardless of the material of the support metal plate 7, and the conversion loss can be reduced. According to the present invention, it is possible to obtain a waveguide-to-microwave (IJ) tubular line converter that is inexpensive, has a simple configuration, and has low conversion loss. The present invention is for satellite broadcasting.
This is particularly effective in cases where low input loss is required, such as in an HF converter, and has the effect of reducing the noise figure of the converter, and by applying the present invention, the noise figure has been improved by about 0.1 to 0.2 dB.

〔Effect of the invention〕

According to the present invention, the skin resistance of the waveguide of a waveguide-to-microstrip line converter is reduced, and the skin loss of the wall current of the waveguide is reduced. Therefore, a low-loss waveguide-to-microsto IJ tube line converter can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a conventional example, and FIG. 2 is an exploded perspective view showing an embodiment of the present invention. ■, 2...Two-split termination short-circuited rectangular waveguide 4...S)
IJ tube conductor 5...Grounding conductor 6...Dielectric substrate
7...Support metal plate 15...Skin metal plate mounting Figure 1, Figure Z

Claims (1)

[Claims] The short-terminated rectangular waveguide is divided into two along a plane perpendicular to the H-plane and parallel to the E-plane, and the microstrip line is closely attached to the supporting metal plate.
A strip conductor of a microstrip line is formed perpendicularly to the H plane at the center of the l-1 plane at a distance of /4 wavelength in the tube, and the microstrip line and supporting metal plate are sandwiched by a terminal short-circuited rectangular waveguide that is divided into two parts. In a waveguide-to-microstrip IJ tube line converter in which the support metal plate located inside the terminated shorted waveguide and the back conductor of the microstrip line have been removed, the newly formed terminated shorted rectangular waveguide tube wall is exposed. A waveguide-to-microstrip line converter characterized in that a U-shaped metal plate is disposed in close contact with a cross section of a support metal plate, with one end in close contact with the top of the support metal plate and the other end in close contact with the bottom of the support metal plate. .