JPS61141203A - Waveguide-strip line converter - Google Patents

Abstract

PURPOSE:To contact a ridge output section and a strip line in an excellent way even when the accuracy of the length of a ridge part and the thickness of a dielectric base by inserting a metallic foil between the dielectric base and a metallic part supporting the dielectric base incorporated with a ridge waveguide. CONSTITUTION:The ridge output section 12 and the strip line 14 are contacted by selecting the thickness of the metallic foil 16 inserted between the dielectric base 13 and a metallic part 17 supporting the base. That is, the dimension error of the length (a) of the ridge 10 and the thickness (b) of the base 13 are absorbed by using the metallic foil 16. Since the metallic foil 16 has more or less a curve in addition, the metallic foil plays a role of a spring by its elasticity to cause sure contact between the strip line and the ridge output.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waveguide-to-stripline converter that can be used for radars, radars, and the like.

2. Description of the Related Art In recent years, microwave integrated circuits (hereinafter simply referred to as MICs) have been actively developed in the microwave and millimeter wave fields. In order to connect the MIC with a waveguide, a waveguide-stripline converter is required, but conversion using a ridge waveguide is often performed in a frequency band above the band.

A conventional waveguide-stripline converter will be described below with reference to the drawings.

Figure 3 is a cross-sectional view of the main parts of a conventional waveguide-stripline converter taken parallel to the E plane in the direction of propagation of the electromagnetic field, where 1 is the metal forming the wall of the waveguide, and 2 is the main part of the converter. The ridge portion 3 of the ridge waveguide is a strifbline contact portion provided to connect the ridge at the output portion 4 to a microstrip line 6 formed on the surface of a dielectric substrate 5 constituting the MIC. Reference numeral 7 denotes a ground plane formed on the surface of the dielectric substrate 5, which is in close contact with a metal part 8 that supports the dielectric substrate integrated with the ridge waveguide (for example, M, V, 5chneider: 11M1cros
tripLin@s for MicmwaveInt
egrated C1rcuits” BSTTMa
y-June 1969).

Problems to be Solved by the Invention However, in the above configuration, the ridge waveguide has a structure in which the slip line 6 and the output section 4 are connected by bringing the strip line contact section 3 of the ridge into contact with each other. In order to obtain good electrical properties (reflection properties and transmission properties), it is necessary to manufacture the length a of the ridge part and the thickness b of the dielectric substrate extremely accurately to achieve the best contact condition. There is.

In view of the above-mentioned problems, the present invention makes it possible to bring the ridge into good contact with the strip line and to achieve excellent electrical characteristics even if the dimensional accuracy of the length a of the ridge part and the thickness b of the dielectric substrate is not high. The present invention provides a waveguide-stripline converter that can be obtained.

Means for Solving the Problems In order to solve the above problems, the waveguide-stripline converter of the present invention includes a dielectric substrate and a metal part supporting the dielectric substrate integrated with the ridge waveguide. A metal foil having a size equal to or larger than that of the dielectric substrate is inserted between the dielectric substrates.

Effects The present invention has the above-described configuration, and the ridge output part and the strip line can be brought into contact by selecting the thickness of the metal foil inserted between the dielectric substrate and the metal part supporting it. Length a of the ridge in Figure 3
and the thickness b of the dielectric substrate can be accommodated by the metal foil. In addition, since the metal foil usually has some curvature, the elasticity of the metal foil acts as a spring, making the contact between the strip line and the ridge output part more reliable.

EXAMPLE Hereinafter, an example of the waveguide-stripline converter of the present invention will be described with reference to the drawings. Figure 1a is a cross-sectional view of the main part of the IJ tube line converter taken parallel to the E plane in the direction of propagation of the electromagnetic field in the first embodiment of the present invention. 1
It is an external view when looking at the left side from the AA' plane in figure a.

In FIGS. 1a and 1b, 9 is the metal forming the wall of the waveguide, 1o is the ridge part of the ridge waveguide, and 11 is the ridge output part 12, which is attached to the surface of the dielectric substrate 13 constituting the MIC. This is a strip line contact portion provided to connect with the formed myolo strip rice 14. 16 is a ground plane formed on the surface of the dielectric substrate 13. Reference numeral 16 is a metal foil, and it is sufficient if the size is the same as or larger than that of the dielectric substrate. Reference numeral 17 denotes a metal part that supports the dielectric, and the wall surface 1 of the waveguide facing the ridge.
The surface matches 8.

In Figure 1, the length of the ridge is a, the thickness of the dielectric substrate is b1, the thickness of the metal foil is c1, and the E side of the waveguide is also determined by setting the thickness C of the metal foil to an appropriate value. The dimensions of each part are d
= a + b + c can be satisfied, and the ridge output part 12 and the strip line 14 can obtain a good contact state. In addition, since the metal foil has some curvature, the metal Due to the elasticity of the foil, the metal foil acts as a spring, making the contact between the stripline and the ridge output more reliable.

FIG. 2 is a sectional view of the main parts of a waveguide-stripline converter showing a second embodiment of the present invention.

In Figure 2, parts with the same numbers as in Figure 1 are
The parts shall have the same functions as those shown in the figure. In the waveguide-stripline converter shown in FIG. There are steps. By providing the steps in this way, the wall surface 18 of the waveguide and the surface forming the ground plane 15 of the dielectric substrate almost match, and the propagation of the electromagnetic field in the ridge waveguide and the propagation of the electromagnetic field in the strip line are reduced. There is no large propagation discontinuity at the boundary, and very excellent propagation performance can be expected. Furthermore, since the positions of the metal foil 16 and the dielectric substrate 13 are defined by the edge portion 20 of the step, the contact between the strip line contact portion 11 and the strip line 14 can be made with higher precision.

Effects of the Invention As described above, the present invention provides a ridge waveguide or a dielectric material by inserting a metal foil between a dielectric substrate and a metal part that supports the dielectric substrate integrated with the ridge waveguide. This is an attempt to absorb errors that occur during the manufacturing of the board, and by setting the thickness of the metal foil to an appropriate thickness, the ridge part of the ridge waveguide and the strip line can be kept in an extremely good contact state. I can do it.

This effect makes it possible to obtain a waveguide-stripline converter with extremely stable characteristics and excellent reproducibility compared to conventional waveguide-stripline converters, making it easier to mass-produce microwave equipment. The extremely excellent effect of being rich in

[Brief explanation of the drawing]

Figures 1a and b are a cross-sectional view and an external view of the main part of a waveguide-stripline converter in one embodiment of the present invention, respectively, and Figure 2 is a cross-sectional view of the main part of another embodiment of the present invention. ,
FIG. 3 is a sectional view of the main parts of a conventional waveguide-stripline converter. 9...Waveguide, 10...Ridge part, 1
1... Strip line contact part, 13...
...Dielectric substrate, 14... Strip line,
15... Ground plane, 16...
Metal foil, 17...Metal part that supports the dielectric substrate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 q t. f?

Claims (2)

[Claims] (1) The output part of the ridge of the ridge waveguide is brought into contact with the strip line formed on the dielectric substrate, and the dielectric substrate and the waveguide are integrated with the ridge waveguide and are opposed to the ridge. A waveguide-stripline converter characterized in that a metal foil having a size equal to or larger than that of the dielectric substrate is inserted between a metal portion supporting the dielectric substrate whose surface coincides with the wall surface of the waveguide-stripline converter. . (2) Features: A step approximately equal to the thickness of the metal foil is provided between the surface of the metal part that supports the dielectric substrate integrated with the ridge waveguide and the wall surface of the waveguide that faces the ridge. A waveguide-stripline converter according to claim 1.