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Dual-band bandpass resonator and dual-band bandpass filter

A resonator-pass, dual-band-pass technology, applied in resonators, waveguide-type devices, electrical components, etc., can solve the problems of insufficient and complete filtering of signals, unfavorable miniaturization of filters, design of dual-band pass filters, etc. Achieving the effect of miniaturization

Inactive Publication Date: 2009-08-26
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to design a dual-band bandpass filter while maintaining a high degree of design freedom of four characteristic values
[0008] also, Figure 51 In the shown dual-band bandpass filter, since the transmission lines are directly connected from the input-side transmission line T1 to the output-side transmission line T9, there is a problem that signals in frequency bands other than the desired passband cannot be sufficiently and completely filtered. To remove unwanted frequency band signals, other band-pass filters need to be used in combination
In addition, since the ends of the transmission line with a predetermined length are connected, it is also disadvantageous from the viewpoint of downsizing the filter.

Method used

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Examples

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no. 1 Embodiment approach

[0073] figure 1 This is a structural example of the dual-band bandpass resonator of the present invention, and the resonator is formed by forming a conductive pattern on one surface of a rectangular dielectric substrate. In addition, conductors exist in hatched areas in the figure, and areas without hatching surrounded by hatched areas represent portions where the dielectric substrate under the conductors is exposed. This description is the same for all the following drawings showing resonators and filters.

[0074] The dual-band bandpass resonator is composed of a center conductor 11 , a set of ground conductors 12 , a center conductor short-circuit portion 13 , and a set of stub conductors 14 . One set of ground conductors is formed at intervals along one set of two opposing sides of the rectangular dielectric substrate, and both ends thereof extend at right angles along the other set of opposing sides of the dielectric substrate so as to approach each other. The input an...

no. 2 Embodiment approach

[0081] image 3 A second embodiment of the dual-band bandpass resonator of the present invention is shown.

[0082] image 3 The dual-frequency bandpass resonator is composed of a center conductor 11 , a set of ground conductors 12 , a center conductor short-circuit portion 13 and a set of stub conductors 24 . Except for the stub conductor 24, everything is the same as the structure of the first embodiment ( figure 1 ) are the same, so the same reference numerals are added, and descriptions are basically omitted. The same applies to the following embodiments.

[0083] The stub conductors 14 of the first embodiment are arranged so that their entire lengths are parallel to the central conductor 11, but the pair of stub conductors 24 of the second embodiment are as follows: image 3 As shown, most of them are parallel to the central conductor 11 from the beginning, but they are bent at approximately right angles toward the ground conductor 12 in the vicinity of the central c...

no. 3 Embodiment approach

[0086] Figure 4 A third embodiment of the dual-band bandpass resonator of the present invention is shown.

[0087] Figure 4 The dual-frequency bandpass resonator is composed of a center conductor 11 , a set of ground conductors 12 , a center conductor short-circuit portion 13 , and a set of stub conductors 34 . The only difference from the first and second embodiments is the stub conductor 34 .

[0088]In the stub conductor 24 of the second embodiment, most of its longitudinal direction is parallel to the central conductor 11, but it bends toward the ground conductor 12 in the vicinity of the central conductor short-circuit portion 13, and then bends toward the ground conductor 12 in front of the ground conductor 12 again. The central conductor short-circuit portion 13 is bent in a direction and connected to the central conductor short-circuit portion 13 . By making the connection position with the center conductor short-circuit portion 13 close to the ground conductor 12...

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Abstract

The present invention relates to a dual-band bandpass resonator and a dual-band bandpass filter. The dual-band bandpass filter according to the present invention includes a plurality of dual-band bandpass resonators. The dual-band bandpass resonator includes a central conductor having a central axis aligned with an input / output direction, a pair of grounding conductors, a central conductor short-circuit part and a pair of stub conductors that are formed on a surface of a dielectric substrate. The pair of grounding conductors are disposed on the opposite sides of the central conductor with a space interposed therebetween. The central conductor short-circuit part short-circuits the pair of grounding conductors, and one end of the central conductor is connected to the central conductor short-circuit part. The pair of stub conductors are disposed in the spaces on the opposite sides of the central conductor symmetrically with respect to the central axis of the central conductor, extend at least partially parallel with the central conductor and are connected to the central conductor short-circuit part at one ends thereof.

Description

technical field [0001] The present invention relates to a resonator and a filter using it, in particular to a dual-band bandpass resonator (Dual-Band Bandpass Resonator) used for signal transmission and reception in mobile communication, satellite communication, fixed microwave communication, and other communication technology fields ) and its dual-band bandpass filter (Dual-Band Bandpass Filter). Background technique [0002] Conventionally, there are roughly two configuration methods for a dual-band bandpass filter characterized by having two passbands. [0003] one is, if Figure 50 As shown, multiple (three in this example) dual-frequency bandpass resonators Q1, Q2, and Q3 that resonate at two frequencies are cascaded (cascade) coupled, and the two ends of the cascade coupling are respectively connected to the input and output ports. P1 and P2 are coupled to form filter 200 (for example, refer to Non-Patent Document 1). In this filter 200, the dual-band bandpass resona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P7/00H01P7/08H01P1/20
CPCH01P1/203H01P7/086H01P1/2013H01P1/20H01P1/205H01P1/213H01P7/08
Inventor 佐藤圭楢桥祥一
Owner NTT DOCOMO INC
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