JPH0271601A - waveguide filter - Google Patents

Abstract

PURPOSE:To attain miniaturization, light weight, and easy manufacturing by forming plural unit waveguides in which rectangular windows are provided in the centers of planes confronting with the opening plane of a box, forming a BPH by connecting the planes on which the rectangular windows are provided so as to be fitted in with each other, and adjusting a frequency by an adjusting piece. CONSTITUTION:One BPF is formed by forming box shape waveguides 12, 13...17 by bending in a direction opposite to grooves along plural grooves, and providing induction windows 18, 19...23. For example, the plane including the induction window of the unit waveguide 13 is fitted in the opening plane of the unit waveguide 12, and six waveguides are fitted in with each other in this example. And the unit waveguide is connected electrically and mechanically to a case having a rectangular through hole, flanges 25 and 26 in which the combination 31 of the waveguides can be housed by combining them setting the inner wall of the case as guide. The adjusting piece 35 is arranged in the waveguide, and a resonance frequency is adjusted at a low level, then, a superior filter characteristic can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a waveguide filter, and particularly to a manufacturing method suitable for a multi-stage bandpass filter in which a coupling metal is formed using a guiding window.

[Conventional technology]

The structure and manufacturing method of a conventional multi-stage waveguide filter coupled by a guide window is a method of fitting a partition plate into a slit provided in a waveguide, as described in Japanese Utility Model Application Publication No. 58-101502. I was taking it.

[Problem to be solved by the invention]

In the above conventional technology, the thickness of the waveguide is thick and the thickness of the partition plate tends to be thick as well.The thinner the partition plate is, the closer the filter characteristics to the theoretical value can be obtained◎Therefore, In the conventional example, which has a relatively thick wall, there is a problem that the filter value tends to differ from the theoretical value, the filter itself is heavy, and the number of man-hours required for processing is also large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waveguide filter in which the partition plate is made as thin as possible, the weight of the filter is reduced, and the filter is easy to manufacture.

[Means to solve the problem]

The above objective is achieved by forming the waveguide itself with a thin plate-shaped conductor and also forming the partition plate at the same time. is formed into a box shape with one side open, a guiding window is provided on the opposite side to the open side to form a unit waveguide, and a multi-stage bandpass filter is constructed by combining a plurality of unit waveguides. I can do it. This makes it difficult to perform work such as fitting the waveguide section and the partition plate section together. In addition, since the resonant frequency adjustment piece that determines the resonant frequency of the unit waveguide can be easily formed in the waveguide portion using the same material, the filter can be manufactured easily and at the same time, the weight ratio can be achieved.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 shows a plan view of a unit waveguide with a guiding window according to the present invention developed on a thin plate.
6 is a conductor plate, 7 is a guide window, and 8, 9, 10, and 11 are grooves made in the thin plate. By bending along the grooves 8, 9, 10 and 11 in the direction opposite to the grooves, a box-shaped unit waveguide with one side open can be constructed, and the conductor plates are not soldered together. It is also possible to connect electrically and mechanically by means such as the following. The front view of the unit waveguide configured in this way is shown in the second figure.
Shown in the figure. A cross section taken along line AA' in FIG. 2 is shown in FIG. 3.

A multistage bandpass filter can be constructed by combining a plurality of unit waveguides having guiding windows constructed in this manner. The width of the guiding window and the length of the waveguide are matched to the constants of the multistage filters, and the filters are connected as shown in FIG. 4 to form one bandpass filter. The figure shows the cross-sectional structure of an example of a five-stage bandpass filter, 12, 15, 14.
i5, 16.17 are unit waveguides, 18.19, 20, 2
1, 22, and 25 are coupling guide windows.

By making the size of the entire surface including the conductor plates 5, 6 and the guide window in FIG. 5 smaller than the thickness of the open surface, for example, the unit waveguide 13 can be placed on the open surface of the unit waveguide 12. The surfaces including the guide windows are fitted into each other, and six unit waveguides are fitted into each other and combined as shown in FIG. Connections within each unit waveguide are made electrically and mechanically by means such as soldering and soldering.

The unit waveguide 17 may be replaced by a flat plate having a guiding window 26.

FIG. 5 shows the combination of the unit waveguides shown in FIG. 4 using a case serving as a guide.

24 is the case, 25.26 is the flange, 27, 2B
, 29.

Reference numeral 50 indicates a hole for a flange, and reference numeral 61 indicates a combination of the unit waveguides shown in FIG. The case has a rectangular through hole that can accommodate the waveguide combination 51, and 7 langes 25 and 26.
Combining the unit waveguides using the inner wall of the case as a guide, connecting the unit waveguides electrically and mechanically using techniques such as soldering, and at the same time connecting the unit waveguides to each other. Connect electrically and mechanically. Note that the case is also effective as a mere guide without a flange.

When housed in a case like this, the unit waveguide is bent without providing grooves 8, 9, 10, and 11 as shown in Figure 1, and has a cross-sectional structure as shown in Figure 6. Also good.

The resonant frequency of a unit waveguide fluctuates slightly due to the effects of manufacturing precision, mutual connections, etc., so it is necessary to offset this through adjustment to achieve an optimal resonant state. Therefore, an adjustment mechanism was installed as shown in Fig. 7. Fig. 7 is a plan view of a unit waveguide, and 062 shows an example in which the conductor plate 3 in Fig. 2 has all the vI4 straightening pieces. A surface including the induction window, 36 is a conductor plate, 6
4 is a U-shaped notch, and 55 is an adjustment piece. Further, FIG. 8 shows a BB' cross-sectional structure. 7 is the guidance window, 5.6
is a conductor plate. The adjusting piece 65 can be easily bent because the thickness of the thin plate constituting the waveguide is as thin as about 0.2 to 0.3 nm, and the resonant frequency can be adjusted low by pushing the protrusion into the waveguide. I can do it. The position of the adjustment piece can be set to be in-plane recognition on the conductor plate 33, and the direction of the convex portion of the adjustment piece 65 can also be set to be opposite to each other. However, if the U-shaped notch becomes large, it may disturb the potential distribution within the waveguide, so it is preferable that it be as small as possible. Such an adjustment piece can be used by combining multiple unit waveguides, and by optimizing the filter characteristics and incorporating it into a case as shown in Figure 5, it is possible to adjust the protrusion like that when adjusting the screw vI4. It is possible to downsize the shape without missing any parts. In addition, when the adjustment piece 5 is assembled in the case,
5, the size of the case can also be made smaller.

Furthermore, the combination of unit waveguides in FIG. 5 may be housed in a case where the unit waveguides are in contact with a circular inner wall, as shown in FIG. This combination is effective in converting and connecting circular waveguides.

FIG. 9 is a cross-sectional view of the combination of unit waveguides in FIG. 4 using the inner wall of the circular waveguide as a guide, where 36 is the combination of unit waveguides, 37 is a guide window, and 38 is a circular guide. It is a wave tube.

〔Effect of the invention〕

According to the present invention, a waveguide bandpass filter with a multi-stage adjustment function can be manufactured compactly, lightweight, and easily, and is effective in improving packaging density and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a developed view of a unit waveguide according to an embodiment of the present invention, and FIG.
The figure is a front view of a unit waveguide, ρ is a sectional view taken along line A-A' in FIG. 2, FIG. 4 is a sectional view showing a combination of unit waveguides, and 5th
The figure is a cross-sectional view of a unit waveguide incorporated into a coos that serves as a guide, FIG. 6 is a cross-sectional view of another example of a unit waveguide, and FIG.
Figure 8 is a plan view showing the adjustment piece, Figure 8 is a sectional view taken along line B-B' in Figure 7 showing the adjustment piece, and Figure 9 is a sectional view in which unit waveguides are combined with the inner wall of a circular waveguide as a guide. It is. 1.2.5.4.5.6... Conductor plate. 7. Guidance window. 8.9.10.11... Groove. 12.15.14.15, 16.17... Unit waveguide. 1B, 19.20.21.22.25... Guidance window. 24...Case. 25.26...2 lunges. 31... Combination of unit waveguides. 34...U-shaped notch. 35...Adjustment piece. 58...Circular waveguide. Akira 4 Akira 50 Ryo 2 / 6 5・ ) Yu 50 Shi Z Gokotsu

Claims (1)

[Claims] 1. A hexahedron made of a series of plate-shaped conductors, one side of which is open, is placed on the side opposite the open side, reaching two long sides of that side, and located in the center of the long sides. A plurality of unit waveguides each having a rectangular window provided parallel to each side of the surface, and a plurality of unit waveguides each having a rectangular window provided therein so that their open surfaces fit into each other's surface provided with the rectangular window. A waveguide filter characterized in that the waveguide filter is housed in a case that is close to the inner wall of the waveguide filter and that can accommodate all of the plurality of unit waveguides at the same time.