JPS5837121Y2 - Fixed attenuator for microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed attenuator for microwaves, and more particularly to a fixed attenuator for microwaves that can be detachably attached to a rectangular waveguide.

A conventional waveguide-type microwave fixed attenuator 4 has a flange 1 for connection to a transmission line such as a waveguide, as shown in a partially cutaway perspective view of an embodiment of the same in FIG. , 1 at both ends thereof, and a radio wave absorber 3 is fixedly disposed approximately at the center of the bottom surface inside the waveguide section 2 by gluing, screwing, or the like.

When the conventional microwave fixed attenuator 4 described above is used (including temporary use) as a part of a microwave circuit device (not shown), it is compared with other devices constituting the microwave device. When making measurements and adjustments, the circuit system is frequently inserted and removed, and as shown in Figure 1, it has a free length l. , or by separately preparing a waveguide with a line length equal to the above l and replacing the waveguide with the microwave fixed attenuator to fix the arrangement of other equipment. Either is configured as a microwave device that occupies a larger space by the length l of the line, and both are inconvenient.

Furthermore, the flanges of the waveguide group that make up the circuit system are also rectangular,
There are various shapes such as circular and special shapes, and to deal with this, it is necessary to prepare a variety of conventional waveguide-shaped microwave fixed attenuators with corresponding flanges, or to separately install a conversion flange. There were some inconveniences such as preparation.

One way to solve the above inconvenience is to use a microwave variable attenuator, but it has a more complicated structure than a fixed attenuator and is very expensive, so it may be necessary to insert multiple attenuators into the circuit system. There is a problem in that it is difficult to meet the demand when adjusting several microwave circuit devices at the same time.

Moreover, even if the cost aspect is ignored, the variable attenuator does not eliminate all of the above-mentioned inconveniences.

The purpose of this application is to solve the above-mentioned inconveniences and problems and provide a fixed attenuator for microwaves that is small, inexpensive, and easy to replace.

The fixed attenuator for microwaves of the present application will be explained below with reference to drawings of embodiments.

FIG. 2 shows a perspective view of an embodiment of the microwave fixed attenuator of the present application and a partial perspective view of an inserted waveguide.

The fixed attenuator 9 for microwaves of the present invention has a locking piece 8 having an elastic portion 8a that presses against the inner wall of a rectangular waveguide 6.
In the example shown in the figure, the hexahedral radio wave absorber 5 is made of a mixed molded product of carbonyl iron and epoxy resin, and the locking piece 8 is made of a thin strip-like copper plate. The waveguide 3 is made of a bent material and is fixedly fixed inside the waveguide 3 by utilizing the elastic stress of the elastic portion 8a.

The fixed attenuator for microwaves of the present invention is obtained by bringing the planar portion of the locking piece 8 and the side wall plane of the radio wave absorber 5 into close contact with each other, and attaching and fixing them by adhesive or the like to integrate them.

That is, the microwave fixed attenuator 9 itself of the present application does not have a waveguide portion.

When the microwave fixed attenuator 9 of the present application is inserted into the rectangular waveguide 6, at least a part of the outer surface of the radio wave absorber 5, for example, the bottom surface S, is brought into close contact with the bottom surface of the inner wall of the waveguide 3. The locking and fixing arrangement is made such that the locking and fixing is ensured and the heat dissipation performance against the heat generated by the radio wave absorber 5 is improved.

Further, a slippery part 8b is provided in a part of the elastic part 8a of the locking piece 8,
When the locking piece 8 is brought into pressure contact with the inner wall of the waveguide 6 via the slippery portion 8b, the insertion and arrangement work described above is facilitated.

As explained above, according to the configuration of the present application, it is possible to easily insert the radio wave absorber with the required amount of attenuation into the rectangular waveguide, lock it and fix it, and attach the radio wave absorber to the inner wall of the waveguide. This is advantageous in the case of a power type microwave fixed attenuator because the heat generated by the radio wave absorber is radiated to the waveguide not only from the closely-contacting outer surface but also from the locking piece.

The waveguide to be inserted does not need to be prepared separately, and can be a waveguide in the existing microwave circuit device, so the material cost is still large even after subtracting the installation cost of the locking piece. In addition, the attenuator itself and the microwave circuit device are also miniaturized.

Furthermore, there are no restrictions on the shape of the flange of the waveguide to be inserted; if the cross section of the conduit is rectangular, the vertical and horizontal dimensions of the rectangular cross section will also depend on the size of the radio wave absorber and the movable range of the elastic part. It is an extremely practical device that does not prevent changes within the system and has wide adaptability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of a conventional fixed attenuator for microwaves, and Fig. 2 is a perspective view of an embodiment of the fixed attenuator for microwaves of the present application, and a waveguide to be inserted. FIG. 5... Radio wave absorber, 8... Locking piece, 8
a...Elastic part, 8b...Smooth part, 6.
...Waveguide.

Claims (1)

[Scope of utility model registration request] 1. A spring material consisting of a plate-shaped locking piece provided with a substantially C-shaped elastic part and a sliding part is fixed to a radio wave absorber made of at least a hexahedron, and the planar part of the locking piece and the radio wave absorber are fixed. The electromagnetic wave absorber is configured such that the electromagnetic wave absorber can be locked and fixed within the waveguide by bringing the side wall planes of the rectangular waveguide into close contact with each other and pressing the elastic portion against the inner wall of the rectangular waveguide. Fixed attenuator for microwaves. 2. The micro micro device according to claim 1, wherein the elastic portion is configured to come into pressure contact with the inner wall of the waveguide via a slippery portion provided in a part of the elastic portion. Fixed wave attenuator.