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Dual-band bandpass resonator and dual-band bandpass filter

A pass-through resonator, dual-band technology, applied to resonators, waveguide devices, circuits, etc., can solve the problems of insufficient and complete filtering of signals, unfavorable filter miniaturization, design of dual-band band-pass filters, etc., to achieve small effect

Inactive Publication Date: 2013-03-13
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] In addition, since the transmission lines of the dual-band bandpass filter shown in FIG. 51 are directly connected from the input-side transmission line T1 to the output-side transmission line T9, there is a possibility that signals in frequency bands other than the desired passband cannot be sufficiently completely filtered. Problem, in order to completely remove unwanted frequency band signals, it is necessary to use other band-pass filters
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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  • Dual-band bandpass resonator and dual-band bandpass filter
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  • Dual-band bandpass resonator and dual-band bandpass filter

Examples

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no. 1 Embodiment approach

[0073] FIG. 1 is a structural example of a dual-band bandpass resonator according to the present invention. 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 and out...

no. 2 Embodiment approach

[0081] FIG. 3 shows a second embodiment of the dual-band bandpass resonator of the present invention.

[0082] The dual-frequency bandpass resonator in FIG. 3 is composed of a central conductor 11 , a set of ground conductors 12 , a short-circuit portion 13 of the central conductor, and a set of stub conductors 24 . All other than the stub conductor 24 are the same as the configuration of the first embodiment ( FIG. 1 ), so the same reference numerals are assigned 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 center conductor 11, but the pair of stub conductors 24 of the second embodiment pass most of the center conductor 11 from the beginning as shown in FIG. 3 . The conductors 11 are parallel, but are bent at approximately right angles to the direction of the ground conductor 12 in the vicinity of the center conductor...

no. 3 Embodiment approach

[0086] FIG. 4 shows a third embodiment of the dual-band bandpass resonator of the present invention.

[0087] The dual-frequency bandpass resonator in FIG. 4 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, the l...

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Abstract

A 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 (11) having a central axis aligned with an input / output direction, a pair of grounding conductors (12), a central conductor short-circuit part (13) and a pair of stub conductors (14) 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 (13) short-circuits the pair of grounding conductors, and one end of the central conductor is connected to the central conductor short-circuit part.

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, as shown in FIG. 50 , cascade-coupling multiple (three in this example) dual-frequency bandpass resonators Q1, Q2, and Q3 that resonate at two frequencies, and the cascade-coupled two The terminals are respectively coupled to the input and output ports P1 and P2 to constitute the filter 200 (see, for example, Non-Patent Document 1). In this filter 200, the dual-band bandpass resonators Q1 and Q3 at both e...

Claims

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Application Information

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Patent Type & Authority Patents(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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