JPH08154008A - Waveguide coaxial transducer - Google Patents

Abstract

PURPOSE: To provide the simply structured waveguide coaxial transducer equipped with a low-pass filter function. CONSTITUTION: A low-pass filter part 3 is constituted by forming a hole part 11 at a prescribed position on the outer wall wide surface of a rectangular waveguide 1 and successively coupling a high impedance part and a low impedance part at the through positions of the central conductor of a connector 2 to be passed through this hole part 1 in coaxial direction. At the same time, an antenna conductor part 4 is protruded from this low-pass filter part 3 to a waveguide cavity just for a prescribed length and further, these central conductors are fixed and held inside the rectangular waveguide 1 by a 'Teflon (R)' support 5 prepared by 'Teflon (R)'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide coaxial converter used for connecting a rectangular waveguide and a coaxial line in communication equipment, and more particularly to a low-pass filter for removing harmonics. The present invention relates to a waveguide coaxial converter having a simple structure including a portion.

[0002]

2. Description of the Related Art A waveguide coaxial converter having a low-pass filter for removing harmonics is known. In this waveguide coaxial converter, for example, as shown in FIG. 3, a coaxial low-pass filter 8 is connected by a connector 2 on a wide outer wall surface of the rectangular waveguide 1 near the terminal end. Alternatively, instead of the coaxial low-pass filter 8, a waveguide low-pass filter 9 in which fine blocks 10 are aligned as shown in FIG. 4 is provided on the inner wall of the waveguide. Is taken.

[0003]

However, in the above-mentioned conventional waveguide coaxial converter, in the case of the coaxial type as shown in FIG. 3, for example, an independent coaxial type low-pass filter 8 is introduced. Since the structure is connected to the wide surface of the outer wall of the wave tube coaxial converter, there is a problem that it is bulky in shape and it is difficult to reduce the size as a whole. Further, in the case of the waveguide type low-pass filter 9 shown in FIG. 4, it is necessary to align the fine blocks 10 with high processing accuracy, so that there is a problem that it is difficult to manufacture.

In view of the above problems, it is an object of the present invention to provide a waveguide coaxial converter having a low-pass filtering function and a small size and a simple structure.

[0005]

A waveguide coaxial converter of the present invention comprises a rectangular waveguide provided with a connector for connecting a coaxial line at a predetermined portion, and a hole is provided at a connector installation portion of a rectangular waveguide wall. A plurality of conductors having different impedances, for example, a conductor having a high-impedance shape and a conductor having a low-impedance shape, are sequentially formed at the penetrating portion of the central conductor of the connector that forms a part and that penetrates this hole and points in the waveguide cavity direction. A low pass filter is coupled to form a low pass filter, and the tip end of the central conductor extending through the low pass filter is guided by a length matching the inner wall of the rectangular waveguide with the pass band. It is characterized by being projected into the cavity.

Preferably, a columnar insulating support having the same outer diameter as the inner diameter of the hole is provided and fixed to the rectangular waveguide wall including the hole, and the center conductor and the low region of the connector are provided. The passing filter is fixed inside the insulating support. For example, one bottom face of the insulating support faces the connector, and the other bottom face abuts the inner wall of the rectangular waveguide facing the hole.

[0007]

In the waveguide coaxial converter of the present invention, the low-pass filter is constructed by sequentially coupling the high-impedance-shaped conductor and the low-impedance-shaped conductor to the central conductor of the connector to form the low-pass filter. It is covered (fixed) with a support and fixed to the rectangular waveguide wall. The center conductor extending from the low pass filter does not disturb the pass band because it matches the pass band, and has both the low pass filtering function and the probe function.
As a result, the number of parts is small and the manufacturing is easy as compared with the structure in which the low-pass filter is separately provided.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a structure of a waveguide coaxial converter according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the waveguide coaxial converter, which has the same function as that of a conventional structure. The same reference numerals are attached to the parts.

Referring to these figures, in the waveguide coaxial converter of this embodiment, a connector 2 for connecting to an external coaxial line (not shown) is arranged at a predetermined portion of the wide surface of the outer wall of the rectangular waveguide 1. Then, the hole wall 11 is formed by increasing the thickness of the pipe wall at the site where the connector is arranged. In addition, a columnar insulating support having the same outer diameter as the inner diameter of the hole 11 such as PTF.
A Teflon support 5 made of E (trade name Teflon) is provided and fixed to the rectangular waveguide wall along the hole 11.

The Teflon support 5 has one bottom face directed to the connector 2 and the other bottom face abutting the inner wall of the rectangular waveguide facing the hole 11, and the inside of the center conductor of the connector 2 is in contact therewith. The low pass filter 3 integrally formed with the antenna and the antenna conductor portion 4 protruding from the inner wall of the rectangular waveguide into the waveguide cavity by a length matching the pass band are fixed.
The antenna conductor portion 4 is for extracting the microwave in the pass band of the low-pass filter 3 from the microwaves propagated in the rectangular waveguide 1, and the position, shape, material, etc. of the microwave pass the pass band. It is assumed to be consistent with.

As shown in FIG. 2, the low-pass filter unit 3 has high-impedance portions 6 and low-impedance portions 7 alternately connected in the axial direction of the coaxial line at the penetrating portion of the central conductor of the connector 2. Is configured. The high impedance part 6 and the low impedance part 7 are determined depending on the shape and structure of the conductor with respect to the frequency used, and can be set arbitrarily according to the pass band.

In the waveguide coaxial converter having such a structure, the central conductor of the connector 2 serves as the low-pass filter 3 and the antenna conductor portion 4, and the low-pass filter 3 and the like are rectangular waveguides. Since it is firmly held by the Teflon support 5 arranged in the pipe 1, the structure is smaller and simpler than the structure in which the low-pass filter is separately provided as shown in FIG. 3, and the number of parts is also small. Less. Further, it is easier to manufacture than the waveguide type low pass filter as shown in FIG.

Although this embodiment is as described above, the technique provided by the present invention is not limited to the description of the above embodiment, and various design changes are possible. For example, the insulating support may be made of a material other than the Teflon support 5 as long as it does not affect the microwave, and if the support material is strong, the shape as shown in FIGS. , It does not have to be structured. Further, the low-pass filter 3 coupled to the central conductor of the connector 2 is not necessarily restricted to the structure shown in the figure.

[0014]

As is apparent from the above description, according to the waveguide coaxial converter of the present invention, the central conductor of the connector serves as a low-pass filter and a probe, and these low-pass filters are used. Etc. are fixed by the insulating support fixed in the rectangular waveguide, so that the overall shape and structure are miniaturized and simplified.

Further, since there is no external portion as compared with the conventional waveguide coaxial converter of this type, even in the place where it was considered impossible to install the low-pass filter in the past, the low-pass filter was not installed. It is possible to add a filtering function, which has the effect of expanding the application.

Further, a structure in which a low-pass filter is separately attached,
Alternatively, as compared with the structure in which a plurality of conductors or dielectrics are arranged on the inner wall of the waveguide, it is extremely easy to manufacture, and the cost is remarkably advantageous.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of an embodiment of a waveguide coaxial converter of the present invention.

FIG. 2 is an enlarged view of a main part of the structure shown in FIG.

FIG. 3 is a sectional view of a conventional waveguide coaxial converter in which a coaxial low-pass filter is separately attached.

FIG. 4A is a partially cut front view of a conventional waveguide type low-pass filter, and FIG. 4B is a plan view thereof.

[Explanation of symbols]

 1 Rectangular Waveguide 2 Connector 3 Low Pass Filter 4 Antenna Conductor 5 Teflon Support 6 High Impedance 7 Low Impedance 11 Hole

Claims (3)

[Claims] 1. A waveguide coaxial converter comprising a connector for coaxial line connection provided at a predetermined portion of a rectangular waveguide, wherein a hole is formed at a connector installation portion of a rectangular waveguide wall and the hole is formed. Forming a low-pass filter by coupling a plurality of conductors having different impedances to the penetrating portion of the central conductor of the connector which passes through the portion and points in the direction of the waveguide cavity. A waveguide coaxial converter characterized in that a tip portion of the central conductor extending through the container is projected from the inner wall of the rectangular waveguide into the waveguide cavity by a length matching the pass band. 2. A columnar insulating support having the same outer diameter as the inner diameter of the hole is fixed to a rectangular waveguide wall including the hole, and the center conductor of the connector and the low-pass filter. The waveguide coaxial converter according to claim 1, wherein the structure is fixed inside the insulating support. 3. The insulative support has one bottom surface directed toward the connector, and the other bottom surface abuts an inner wall of the rectangular waveguide facing the hole. 2. The waveguide coaxial converter described in 2.