JPH08335808A - Terminator for waveguide - Google Patents

Abstract

PURPOSE: To provide a terminator of a simple constitution which can adjust its load attenuation value and can be easily attached to and detached from a waveguide by machining a wave absorber in accordance with the shape of an opening part formed at the termination part of the waveguide and inserting the wave absorber into the termination part of the waveguide. CONSTITUTION: The lumber serving as a wave absorber is machined into a conical waveguide terminator 13 according to the shape, a round shape of inner diameter γ, of an opening part 11a formed at the termination part of a waveguide 11. Thus the constitution of the terminator 13 is simplified and therefore the terminator 13 can be directly put into the termination part of the waveguide 11 made of machined lumber. As a result, such processes can be omitted as those where the terminal machining processing is applied, a guide is attached and an adaptor is fixed at the termination part of the waveguide 11 respectively. Then the terminator 13 can be easily attached to and detached from the waveguide 11. In addition, the terminator 13 is made of lumber and therefore lighter than the metallic one together with its easier handling. It is also possible to adjust the load attenuation value of the terminator 13 by changing its tip angle or changing the shape of the terminator 13 into a truncated cone shape, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide terminator.

[0002]

2. Description of the Related Art Microwaves and millimeter waves are widely used in the field of physics such as long-distance telephone, television broadcasting, radar, and other physical property research. Microwaves and millimeter waves are hundreds of MH
It is an electromagnetic wave in a very wide frequency range from z to several tens GHz.

For transmission of microwaves and millimeter waves (antenna to transmitting device, receiving device), coaxial lines, strip lines, parallel two-wire lines, etc. are used at a frequency of several thousand MHz or less, and are mainly conducted at higher frequencies. Wave tubes are used.

The waveguide is a tubular body made of metal and having a rectangular (or circular) cross section, and flanges are provided at both ends thereof. The inside of the waveguide may be plated with silver (or gold) to suppress transmission loss due to the skin effect. The characteristics of the waveguide depend on its dimensional accuracy and shape.

FIG. 2 is a block diagram for measuring the characteristics of the waveguide.

In the same figure, a radio wave is made incident from the oscillator 1 to the waveguide 2, the amount of reflection from the inside of the waveguide 2 and the terminal is detected through the directional coupler 3, and analyzed by the analyzer 4, The voltage standing wave ratio, reflection loss, etc. of the waveguide 2 are measured.

At this time, if an appropriate load attenuation amount does not exist at the end of the waveguide 2, impedance mismatch occurs at the terminal, the reflection amount becomes too large, and the characteristic measurement of the waveguide 2 becomes impossible. .

Therefore, in order to measure such characteristics of the waveguide 2 (voltage standing wave, reflection loss, etc.), a waveguide terminator 5 for reflecting the microwave propagating in the waveguide 2 is introduced. Wave tube 2
Need to be attached to.

In order to attach the waveguide terminator 5 to the waveguide 2, as shown in FIG. 3, a terminal processing (flange tool) is applied to the terminal end of the waveguide 2 using a dedicated tool (flanging tool) not shown. ), Attach the guide 6 and fix the adapter 7 with bolts (not shown) as shown in FIG.
The waveguide terminator 5 having a rectangular cross section was aligned with a gauge and fixed with a clip (not shown) or the like.

[0010]

By the way, in order to install the waveguide terminator 5 at the terminal end of the waveguide 2, the waveguide 2 must be prepared in advance.
Terminal processing of the end part of, and plugging (guide 6,
It took time and labor to attach the adapter 7) and the waveguide terminator 5. Moreover, it took time and effort to remove the connector after the measurement. Further, the load attenuation amount of the waveguide terminator 5 is a fixed value, and when adjusting the load attenuation amount, the waveguide terminators having different load attenuation amounts must be attached to or removed from the waveguide 2. It was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a waveguide terminator which has a simple structure and can be easily attached to and detached from a waveguide.

[0012]

In order to achieve the above object, the present invention is to process a radio wave absorber according to the shape of an opening at the end of a waveguide and insert the wave absorber at the end of the waveguide. This is the amount of load attenuation.

In addition to the above structure, the waveguide terminator of the present invention uses wood for the electromagnetic wave absorber.

In addition to the above configuration, the waveguide terminator of the present invention may have a conical shape.

In addition to the above configuration, the waveguide terminator of the present invention may have a wedge shape.

[0016]

According to the above structure, the wave absorber is processed into a waveguide terminator in accordance with the shape of the opening at the end of the waveguide, and the structure is simplified. By inserting the terminator for the waveguide into the end of the waveguide, the steps of applying terminal processing to the end of the waveguide, attaching guides, and fixing adapters are omitted, It is easy to attach and remove the terminator. When wood is used for the radio wave absorber, the processing is easier than that of a conventionally used metal waveguide terminator. If the shape is a cone or a wedge, it can be easily attached to the end of the waveguide.

[0017]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the waveguide terminator of the present invention, and shows a state in which it is inserted into a waveguide.

Reference numeral 10 denotes a conductor of a waveguide 11 having a circular cross section, and the outside of the conductor 10 is covered with a jacket 12. A waveguide terminator 13 is inserted into the opening at the end of the waveguide 11. The waveguide terminator 13 is made of wood and has a conical shape. For wood, it is preferable to use an oak material or the like that has good radio wave absorption and is easy to process.

Next, the operation of the embodiment will be described.

The wood as a radio wave absorber is processed into a conical-shaped waveguide terminator 13 in accordance with the shape of the opening 11a at the end of the waveguide 11, that is, a circle having an inner diameter φ. By inserting the waveguide terminating device 13 made of a simplified and processed wood into the end of the ordinary waveguide 11 as it is, it is possible to perform terminal processing on the end of the waveguide as in the conventional case. Since the steps of attaching the guide and fixing the adapter are omitted, the waveguide terminator can be easily attached and detached. Further, since the waveguide terminator is made of wood, it is lighter and easier to handle than a metal waveguide terminator.

The amount of load attenuation of the waveguide terminator 13 can be adjusted by changing the shape, for example, by changing the angle of the tip or by making it into a truncated cone shape.

In the above, according to the present embodiment, wood serving as a radio wave absorber is processed into a conical waveguide terminator according to the shape of the opening at the end of the waveguide, and the end of the waveguide is processed. Since the load attenuation amount is obtained by inserting the structure, the structure is simple and the attachment / detachment to / from the waveguide becomes easy.

In the present embodiment, the case where wood is processed into a conical shape has been described, but the present invention is not limited to this, and when the waveguide has a rectangular cross section, wood may be processed into a wedge shape. Good. Further, although the terminator for the waveguide is made of wood, the present invention is not limited to this, and a sponge coated with carbon may be used as long as it can absorb radio waves and is easily processed.

[0025]

In summary, according to the present invention, the following excellent effects are exhibited.

The electromagnetic wave absorber is processed according to the shape of the opening at the end of the waveguide and is inserted into the end of the waveguide, so that the waveguide has a simple structure and can be easily attached to and removed from the waveguide. A tube terminator can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a waveguide terminator of the present invention.

FIG. 2 is a block diagram for measuring characteristics of a waveguide.

FIG. 3 is a diagram showing the end portion of the waveguide after being subjected to terminal processing.

FIG. 4 is a view in which a connector and a conventional terminator for waveguide are attached to the terminal end of the waveguide.

[Explanation of symbols]

 11 Waveguide 11a Opening 13 Waveguide terminator

Claims (4)

[Claims] 1. A waveguide characterized in that a wave absorber is processed in conformity with the shape of an opening at the end of the waveguide and is inserted into the end of the waveguide so as to provide a load attenuation amount. Tube terminator. 2. A wood is used for the radio wave absorber.
The waveguide terminator described. 3. The waveguide terminator according to claim 1, wherein the wave absorber has a conical shape. 4. The waveguide terminator according to claim 1, wherein the wave absorber has a wedge shape.