JPH0750501A - Waveguide type band pass filter - Google Patents

Abstract

PURPOSE:To provide a waveguide type band pass filter not large in size when the filter is connected to a peripheral circuit without cost increase. CONSTITUTION:A rectangular path (waveguide) is formed to a waveguide section 21a along a predetermined direction, and a resonator 22 provided with a dielectric window 22a is arranged at a predetermined position o the path. A cover 21b is put to the waveguide section. A circulator and a band pass filter are formed to one waveguide in the waveguide type band pass filter, resulting that the size is made small and the cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide type bandpass filter, and more particularly to the structure of a resonator used in a waveguide type bandpass filter.

[0002]

2. Description of the Related Art Generally, a waveguide type band-pass filter having a resonance system formed of conductor rods (for example, Mirz).
ai et al. , "Intelligent Al
ignition of Waveguide Filter
ers using a Machine Learn
ing Approach "IEEE Trans.M
TT vol. 37, No. 1, January 19
89, page 168) and a filter having a resonance system with an inductive window (for example, Bunichi Oguchi, "Microwave and Millimeter Wave Circuits", Nippon Telegraph and Telephone Public Corporation, Research Institute of Electrical Communication,
Published by Maruzen (see page 265)).

In such a filter, a resonator is arranged in a rectangular waveguide. For example, when it is used together with a circulator in a microwave circuit, a new flange is provided between the circulator and the band pass filter. Is provided to connect the circulator and the bandpass filter.

An example of this type of waveguide band-pass filter will be outlined with reference to FIG.

As shown, the waveguide 11 has an inductive window 12
Are formed at predetermined intervals in the axial direction, and thereby the waveguide type bandpass filter 13 is constituted. The waveguide type band pass filter 13 is provided with circulators 14 and 15
When arranging in between, the flange 11 is attached to both ends of the waveguide 11.
A is provided and flanges 14a and 15a are also provided on the circulators 14 and 15, respectively, and the waveguide type bandpass filter 13 and the circulators 14 and 15 are connected using these flanges. A flange is also required when connecting not only the circulator but also other peripheral circuits to the waveguide type bandpass filter.

[0006]

As described above, in the conventional waveguide type band-pass filter, when connecting to a peripheral circuit (for example, a circulator), a flange is newly provided to connect to the peripheral circuit. Therefore, there is a problem that not only the size of the flange is increased, but also the cost is increased.

An object of the present invention is to provide a waveguide type bandpass filter which does not increase in size when connected to a peripheral circuit and does not increase the cost.

[0008]

According to the present invention, there is provided a waveguide portion having a rectangular passage formed along a predetermined direction, and an inductive window arranged at a predetermined position of the passage. A waveguide band-pass filter having a resonator and a lid part that is joined to the waveguide part so as to close the passage and forms a waveguide with the waveguide part is obtained. To be

[0009]

EXAMPLES The present invention will be described below based on examples.

Referring to FIG. 1, the waveguide 21 has a waveguide portion 2
1 a and a lid portion 21 b are provided, and a waveguide (passage) 21 c having a rectangular cross section is formed in the waveguide portion 21 a.
Then, a groove portion 21d in which a resonator 22 described later is arranged is formed at a predetermined position of the waveguide 21c.

Here, also referring to FIG. 2, the resonator 22 is
For example, the resonator 22 is formed by hollowing out the inside of the metal block, and the resonator 22 is orthogonal to the waveguide 21c.
Inductive windows 22a are formed so as to face each other on a part of the surfaces (two surfaces that shield the waveguide 21c).

The resonator 22 constructed as described above is arranged in the groove 21d so that the inductive window 22a stands upright with respect to the waveguide (this inductive window is 1/2).
Arranged at wavelength intervals). Then, the waveguide 21a is covered with the lid 21b to form a waveguide band-pass filter.

In such a waveguide type band pass filter, since the resonator 22 made of a metal block is embedded in the waveguide 21, the inductive window and the waveguide are particularly formed in the H plane where loss is likely to occur. Good contact with the tube wall can be achieved.

By the way, when the above-mentioned waveguide type bandpass filter is used together with peripheral equipment, for example, a circulator, the configuration shown in FIG. 3 is adopted. That is, in the waveguide type band pass filter shown in FIG. 1, the resonator 22 substantially embedded in the waveguide 21 functions as a filter. Circulator 23 in advance
And 24 are formed in advance, and the resonator 22 is arranged (embedded) between the circulators 23 and 24 as described above. Then, as described above, the waveguide 21 may be configured by covering the waveguide 21a with the lid 21b.

Thus, in the above-described embodiment, the circulator and the bandpass filter can be formed in one waveguide, and as a result, the circulator and the waveguide type can be formed by using the flange as in the conventional case. There is no need to connect with a bandpass filter.

When the waveguide is constructed by joining the waveguide and the lid as described above, loss is likely to occur at the contact surface between the inductive window and the H surface, but the resonator block is used. By embedding, the loss can be reduced.

[0017]

As described above, according to the present invention, since the resonator block having the inductive window is substantially embedded in the waveguide, the flange is provided as in the conventional case when connecting the peripheral device. There is no need, and as a result, it is possible to reduce the cost without increasing the size (that is,
It will be possible to collect). Further, since the resonator block having the inductive window is substantially embedded in the waveguide, it is possible to prevent an increase in passage loss due to poor contact between the inductive window and the H surface. There is.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a waveguide type bandpass filter according to the present invention.

2A is a vertical cross-sectional view of the waveguide type bandpass filter shown in FIG. 1, and FIG. 2B is a cross-sectional view of the waveguide type bandpass filter shown in FIG.

FIG. 3 is a diagram showing an example in which the waveguide type bandpass filter according to the present invention is used together with a circulator.

FIG. 4 is a diagram showing a connection between a conventional waveguide type band pass filter and a circulator.

[Explanation of symbols]

 21 waveguide 21 21a waveguide part 21b lid part 21c waveguide (passage) 21d groove part 22 resonator 22a inductive window 23, 24 circulator

[Procedure amendment]

[Submission date] November 18, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Generally, a waveguide type band-pass filter having a resonance system formed of conductor rods (for example, Mirz).
ai et al. , "Intelligent Al
ignition of Waveguide Filter
ers using a Machine Learn
ing Approach "IEEE Trans.M
TT vol. 37, No. 1, January 19
89, page 168) and a filter having a resonance system with an inductive window (for example, Bunichi Oguchi, "Microwave and Millimeter Wave Circuits", Nippon Telegraph and Telephone Public Corporation, Research Institute of Electrical Communication,
Published by Maruzen (see page 265) is known.

Claims (2)

[Claims] 1. A waveguide section in which a rectangular passage is formed along a predetermined direction, a resonator provided at a predetermined position of the passage and having an inductive window, and the waveguide section. A waveguide-type bandpass filter, comprising: a lid portion that is joined so as to block the passage and forms a waveguide together with the waveguide portion. 2. The waveguide type band pass filter according to claim 1, wherein the inductive windows are formed at 1/2 wavelength intervals. .