JPH0578002U - Bandpass filter - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a band-pass filter that prevents electrical contact failure between the impedance converter and the resonance plate and does not require position adjustment between the impedance converter and the resonance plate. A metal plate in which a plurality of resonance plates are formed in a comb shape, and a pair of metal plates sandwiching the metal plate and pressure generated by tightening a plurality of screws arranged in two rows to make electrical contact with the metal plate In a bandpass filter composed of a metal case, a plurality of resonance plates are integrally formed in a frame in a comb shape to keep a predetermined distance between the plurality of resonance plates and between the frame and the plurality of resonance plates. A metal plate arranged inside the plurality of screw rows arranged in a row is provided, and by making the width of the frame narrow, the contact between the frame and the metal case is made uniform.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-frequency bandpass filter, and more particularly to a bandpass filter with improved positioning and electrical contact between components of the bandpass filter.

[0002]

[Prior Art]

 An example of a conventional bandpass filter is shown in FIG. In FIG. 8, 1 and 4 are metal cases of the bandpass filter, 2 and 3 are metal plates on which the impedance converter 100 and the resonance plate 101 are formed, and 5 are screws for fixing the components 1 to 4. is there. The metal plates 2 and 3 are fixed by being sandwiched between the metal cases 1 and 4, and the metal plates 2 and 3 are pressed against the contact surfaces “a” and “b” of the metal cases 1 and 4 so that the metal plates It is electrically connected to the cases 1 and 4. Here, the impedance converter 100 is for matching with an external circuit, and the width of the resonance plate 101 and the space between the resonance plates are determined by the center frequency, band width, etc. of the bandpass filter.

[0003]

[Problems to be solved by the device]

 In the structure shown in FIG. 8, the unevenness of the contact surfaces “a” and “b” of the metal cases 1 and 4 causes electrical contact failure at the most important roots of the impedance converter 100 and the resonance plate 101. In order to prevent this electrical contact failure, it is sufficient to provide screw holes like "C" at the roots of the impedance converter 100 and the resonance plate 101, respectively, and securely fix them with screws. It is difficult to provide individual screw holes because the space between the two is narrow. Further, since the metal plates 2 and 3 are not integrated, it is difficult to accurately position the impedance converter 100 and the resonance plate 101, the metal plate 2 and the resonance plate 101, or the metal plate 3 and the impedance converter 100. In addition, there is a problem that the number of processing man-hours is increased due to the provision of the screw holes. Therefore, an object of the present invention is to realize a bandpass filter which prevents electrical contact failure between the impedance converter and the resonance plate portion and does not require position adjustment of the impedance converter and the resonance plate.

[0004]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, a metal plate having a plurality of resonator plates formed in a comb shape and a pressure generated by tightening a plurality of screws arranged in two rows by sandwiching the metal plate, In a bandpass filter composed of the metal plate and a set of metal cases for making electrical contact, the plurality of resonator plates are integrally formed in a frame in a comb shape, and the plurality of resonator plates are provided between the plurality of resonator plates and the frame. By maintaining a predetermined distance from the plurality of resonance plates and providing metal plates arranged inside the plurality of screw rows arranged in two rows, and narrowing the width of the frame, It is characterized in that the frame and the metal case are configured so that the contact between them is uniform.

[0005]

[Action]

 Since the impedance converter and the resonance plate are integrally formed on the metal plate and the width of the frame part of this metal plate is made narrow, accurate positioning between the impedance converter and the resonance plate etc. is not required, and the impedance converter and the resonance plate are not necessary. Good electrical contact at the base of the board can be obtained.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing components of a first embodiment of a bandpass filter according to the present invention. Here, 1, 4 and 5 are assigned the same reference numerals as those in FIG. In FIG. 1, 6 is a metal plate in which the impedance converter 100 and the resonance plate 101 are integrated. 2 is a plan view of the metal plate 6, and FIG. 3 is a sectional view taken along line A-A 'when the embodiment shown in FIG. 1 is assembled.

The metal plate 6 is arranged inside the screw row of the screws 5 arranged in two rows as shown in FIG. In addition, by making the width of “a” in FIG. 2 narrower, the contact surface from “b” to “e” in FIG. 3 can be made smaller, and the vertical pressure when tightened with the screw 5 is “ Focus on the contact surface from "b" to "e". As a result, good electrical contact between the impedance converter 100 and the base of the resonance plate 101 can be obtained. Further, the metal plate 6 does not need a screw hole as shown by “C” in FIG. 8, and the impedance converter 100 and the resonance plate 101 are integrally molded in the frame, so that the impedance converter 100 and the resonance plate 101 are formed. Also, accurate positioning such as distance from the frame is not required.

FIG. 4 is a plan view showing a metal plate used in the first embodiment of the bandpass filter according to the present invention, in which an inductor is used instead of the impedance converter 100. In FIG. 4, 6a is a metal plate, 7 and 8 are inductors, and 9 and 10 are signal output lines.

FIG. 5 is a plan view showing a metal plate used in the first embodiment of the bandpass filter according to the present invention, in which a capacitor is used instead of the impedance converter 100. In FIG. 5, 6b is a metal plate, 11 and 12 are capacitors, and 9 and 10 are signal output lines. Further, since the metal plates 6a and 6b in FIGS. 4 and 5 do not use the impedance converter 100, the bandpass filter can be downsized.

FIG. 6 is a plan view showing a metal plate used in the first embodiment of the bandpass filter according to the present invention, in which a part of the frame is deleted. In FIG. 6, 6c is a metal plate, and the part "a" in FIG. 6 is deleted. With such a structure, when a wire processing machine or the like is used, processing can be performed in one step, and the number of steps can be reduced.

FIG. 7 is a perspective view showing respective parts of the second embodiment of the bandpass filter according to the present invention. In FIG. 7, 1a and 4a are metal cases of the bandpass filter, and 6d is a metal plate in which the impedance converter 100 and the resonance plate 101 are integrated. In FIG. 7, in order to accurately position the metal plates 1a and 4a and the metal plate 6d, grooves 13 and 14 for positioning the metal plate 6d are formed in the metal cases 1a and 4a. Further, the grooves 13 and 14 have an oval shape so that they can be easily processed by a machine tool such as a milling cutter. However, in FIG. 7, the frame portion of the metal plate 6d and the grooves 13 and 14 are thickly shown so that the configuration can be easily recognized, but in reality, the frame portion of the frame portion is the same as in the first embodiment shown in FIG. The width is narrow.

[0012]

[Effect of the device]

 As is clear from the above description, the present invention has the following effects. Since the impedance converter and the resonance plate are integrally formed on the metal plate in the frame, accurate positioning between the impedance converter and the resonance plate is not necessary, and by making the width of the frame part of the metal plate narrow, Good electrical contact between the impedance converter and the base of the resonator plate can be obtained. Further, since the screwing of the metal plate is unnecessary, the number of steps can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing components of a first embodiment of a bandpass filter according to the present invention.

2 is a plan view showing a first example of the metal plate of the first embodiment shown in FIG. 1. FIG.

FIG. 3 is a sectional view of the first embodiment shown in FIG. 1 when assembled.

FIG. 4 is a plan view showing a second example of the metal plate of the first embodiment shown in FIG.

5 is a plan view showing a third example of the metal plate of the first embodiment shown in FIG. 1. FIG.

FIG. 6 is a plan view showing a fourth example of the metal plate of the first embodiment shown in FIG.

FIG. 7 is a perspective view showing components of a second embodiment of the bandpass filter according to the present invention.

FIG. 8 is a perspective view showing components of an example of a conventional bandpass filter.

[Explanation of symbols]

 1,1a, 4,4a Metal case 2,3,6,6a, 6b, 6c, 6d Metal plate 5 Screw 7,8 Inductor 9,10 Signal extraction line 11,12 Capacitance 13,14 Groove 100 Impedance converter 101 Resonance Board

Claims (1)

[Scope of utility model registration request] 1. A metal plate having a plurality of resonator plates formed in a comb shape,
In a bandpass filter composed of a pair of metal cases that make electrical contact with the metal plate by a pressure generated by sandwiching the metal plate and tightening a plurality of screws arranged in two rows, The plurality of resonance plates are integrally formed in a comb shape to keep a predetermined distance between the plurality of resonance plates and between the frame and the plurality of resonance plates, and the plurality of screw rows arranged in two rows. A bandpass filter comprising a metal plate disposed inside, and by making the width of the frame narrower, the contact between the frame and the metal case becomes uniform.