JPH0644684B2 - Coaxial waveguide converter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coaxial waveguide converter used on the output side and the input side of, for example, a high-frequency amplifier, a high-frequency low-noise amplifier, and the like.

[Conventional technology]

Conventionally, as shown in FIG. 3, a coaxial waveguide converter of this type has a dielectric provided inside the rectangular waveguide 1 at a position separated from the short-circuit surface 2 by about 1/4 wavelength in the guide wavelength. The structure is such that the tubular antenna conductor pin 5 is inserted into the body sleeve 4.

[Problems to be solved by the invention]

In the above-mentioned conventional coaxial waveguide converter, the position of the waveguide short-circuit surface 2, the distance of protrusion of the antenna conductor pin 5 into the waveguide, and the dielectric sleeve 4 are determined by the manufacturing precision.
Due to the variation in the shape, the impedance shifts in the used band, and there is a drawback that the manufacturing is not possible with good reproducibility. Further, when the used band is shifted, there is a drawback that all the antenna parts to be used must be replaced.

In contrast to the above-mentioned conventional coaxial waveguide converter, the present invention is to insert a dielectric rod or a metal ring in the same dielectric sleeve without changing the length of the antenna conductor pin. This has an original content that the electric length of the antenna in the waveguide can be changed.

[Means for solving problems]

In the coaxial waveguide converter of the present invention, the outer step portion provided on the outer circumference is brought into contact with the first tube wall of the rectangular waveguide, and the outer circumference on the tip side is provided in the hole provided in the first tube wall. Inside of the rectangular waveguide by inserting a small diameter portion of the rectangular waveguide into the rear end and fitting the rear end portion thereof into a hole formed in a second tubular wall of the rectangular waveguide facing the first tubular wall. A first dielectric sleeve having a central hole having a smaller diameter portion on the tip side than the portion, and a step portion provided on the tip portion is brought into contact with the inner step portion of the first dielectric sleeve to attach the tip portion to the An antenna conductor pin that is inserted into the tip of the center hole and fits in the center hole; and a second pin that is inserted into the center hole of the first dielectric sleeve and has its tip abutting the rear end of the antenna conductor pin. Dielectric sleeve of
A dielectric rod inserted into the second dielectric sleeve;
A plate that abuts the rear ends of the first and second dielectric sleeves and is attached to the outer surface of the second tube wall of the rectangular waveguide.

The coaxial waveguide converter of the present invention includes a conductor pin for an antenna and a second
A metal ring that fits in the center hole of the first dielectric sleeve is inserted between the dielectric sleeves of the first dielectric sleeve, and the tip of the second dielectric sleeve is brought into contact with the rear end of the antenna conductor pin through the metal ring. It can also be configured.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is an embodiment of the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a sectional view. Figure 1 (a) (b)
In order to guide the antenna conductor pin 5 inside the rectangular waveguide 1, the dielectric sleeve 4 is inserted from the lower surface of the waveguide 1, and the antenna conductor pin 5 ( A tubular sleeve having a step portion on the outer periphery is inserted, and the dielectric sleeve 4 of the conductor pin 5 for the antenna is further inserted.
A dielectric sleeve 6 is inserted to fix the inner position. Furthermore, the dielectric rod 7 is inserted into the dielectric sleeve 6, and these dielectric sleeves 4 and 6 prevent the dielectric rod 7 from protruding and falling from the lower surface of the waveguide 1. For this reason, the antenna supporting metal plate 8 has a rectangular waveguide 1.
It is fixed to the lower surface of the with screws.

That is, a stepped portion having a small diameter tip is provided on the outer periphery of the dielectric sleeve 4, and the tip end portion of the dielectric sleeve 4 is fitted into a small diameter hole provided in the upper tube wall of the rectangular waveguide 1 so that the dielectric sleeve 4 is formed. The rear end of the rectangular waveguide 1 is brought into contact with the upper pipe wall of the rectangular waveguide 1, and the rear end of the electric conductor sleeve 4 is fitted into the hole formed in the lower pipe wall of the rectangular waveguide 1. A step portion whose tip has a small diameter is also provided in the center hole of the dielectric sleeve 4. In the antenna conductor pin 5, the step portion is brought into contact with the step portion in the center hole of the dielectric sleeve 4, the small diameter portion on the tip side is inserted into the tip small diameter portion in the center hole of the dielectric sleeve 4, and the rear end side is formed. Dielectric sleeve 4
Fit the rear end side of the center hole of. The front end of the dielectric sleeve 6 contacts the rear end of the antenna conductor pin 5, and the rear ends of the dielectric sleeves 4 and 6 and the dielectric rod 7 contact the metal plate 8.

In the present embodiment, the electrical length of the antenna can be freely changed by temporarily removing the antenna part supporting metal plate 8 and replacing the dielectric rod 7 with one having a different length.

FIG. 2 shows another embodiment of the present invention. FIG. 2 (a) is a plan view and FIG. 2 (b) is a sectional view. In this embodiment, unlike the embodiment shown in FIGS. 1A and 1B, a metal ring 9 is inserted between the lower end of the antenna conductor pin 5 and the upper end of the dielectric sleeve.

In this embodiment, by exchanging the metal ring 9 and the dielectric sleeve 6, the variable range of the electrical length can be further widened as compared with the embodiment shown in FIGS. 1 (a) and 1 (b).

〔The invention's effect〕

As described above, the present invention has an effect that the electric length of the antenna can be freely changed by changing the length of the dielectric rod inserted in the second dielectric sleeve. Further, by inserting a metal ring directly under the antenna conductor pin, the variable range of the electrical length can be further expanded. Therefore, it is effective to obtain matching when a product with a different impedance is inserted due to variations in the dimensions of machining.

[Brief description of drawings]

1 (a) and 1 (b) are plan views and sectional views of an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are plan views and sectional views of other embodiments of the present invention, respectively. , Third
1A and 1B are a plan view and a sectional view of a conventional coaxial waveguide converter, respectively. 1 ... Rectangular waveguide, 2 ... Short-circuited surface, 3 ... Flange, 4
... Dielectric sleeve, 5 ... Conductor pin for antenna, 6 ...
... Dielectric sleeve, 7 ... Dielectric rod, 8 ... Antenna supporting metal plate, 9 ... Metal ring.

Claims (2)

[Claims] 1. An outer stepped portion provided on the outer circumference is brought into contact with a first tube wall of a rectangular waveguide, and a small diameter portion of the outer circumference on the tip side is fitted into a hole provided in the first tube wall. The rear end portion is fitted into a hole formed in a second pipe wall of the rectangular waveguide, which is opposed to the first pipe wall, so that the tip end side has a smaller diameter than the inner stepped portion provided in the rectangular waveguide. First having a central hole as part
The dielectric sleeve and the stepped portion provided at the tip end of the first sleeve.
In the center hole of the first dielectric sleeve, and an antenna conductor pin that abuts against the inner step of the dielectric sleeve and inserts the tip into the tip of the center hole and fits into the center hole; A second dielectric sleeve that is inserted and a tip of which abuts against a rear end of the antenna conductor pin, a dielectric rod that is inserted into the second dielectric sleeve, and the first and second dielectric sleeves. A plate abutting the rear end of the rectangular waveguide and attached to the outer surface of the second tube wall of the rectangular waveguide. 2. A metal ring that fits into the center hole of the first dielectric sleeve is inserted between the conductor pin for the antenna and the second dielectric sleeve, and the tip of the second dielectric sleeve is inserted through the metal ring. The coaxial waveguide converter according to claim 1, wherein the coaxial waveguide converter abuts on a rear end of the antenna conductor pin.