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Double-band-pass microstrip filter

A technology of microstrip filter and double passband, which is applied in the filter field to achieve the effect of small stopband bandwidth

Active Publication Date: 2012-06-20
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but figure 1 The frequency band that can be achieved by the design of the SIR dual-passband microstrip filter shown can only realize the situation that the distance between the two passbands is far away, and the stopband between the two passbands is generally 40%, and the passband is relatively wide. over 10%

Method used

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Embodiment Construction

[0021] see figure 2 , which is a structural schematic diagram of the double-passband microstrip filter of the present invention. The dual passband microstrip filter 20 includes a first sub-microstrip filter 22 , a second sub-microstrip filter 24 , a first signal transmission line 26 and a second signal transmission line 28 .

[0022] see image 3 ,actually figure 2 A schematic structural diagram of the first sub-microstrip filter 22 is shown. The first sub-microstrip filter 22 is a fourth-order generalized Chebyshev bandpass filter, including a first resonator 222 , a second resonator 224 , a third resonator 226 and a fourth resonator 228 . The first resonator 222 includes a U-shaped unit 2221 , a first bending unit 2222 and a second bending unit 2223 . The U-shaped unit 2221 is composed of two left-right symmetrical side walls and a connecting portion connecting the side walls. The line connecting the two endpoints of the open end of the U-shaped unit 2221 is taken as t...

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Abstract

The invention discloses a double-band-pass microstrip filter which comprises a group of first sub microstrip filters and a group of second sub microstrip filters with different structures, as well as first signal transmission lines and second signal transmission lines, wherein the first signal transmission lines are respectively connected with the first sub microstrip filters and the second sub microstrip filters and are respectively connected with signal input ends; the second signal transmission lines are respectively connected with the first sub microstrip filters and the second sub microstrip filters and are respectively connected with signal output ends, thus the first sub microstrip filters and the second sub microstrip filters are connected in parallel. The centre frequencies, the band widths and in-strip characteristics of two pass bands of the double-band-pass microstrip filter can be regulated individually, thus the smaller stop band width between the two pass bands can be met by the microstrip filter disclosed by the invention.

Description

technical field [0001] The invention relates to a filter applied in a wireless communication system, in particular to a double-passband microstrip filter. Background technique [0002] As the front-end equipment of the wireless communication system, there is an urgent need for high selectivity, small size, low cost, and flexible design of RF filters for efficient spectrum utilization. Today's communication systems require simultaneous work in multiple communication frequency bands to save costs, that is, multi-passband low-cost filters have become indispensable devices in these systems. The microstrip filter has an absolute advantage in low cost. Therefore, the dual-passband microstrip filter has also been extensively studied in the industry, such as filters based on SIR dual-passband resonators. [0003] see figure 1 , which is a structural schematic diagram of a SIR dual-passband microstrip filter in the prior art. The dual-pass band microstrip filter 10 includes a fir...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 张娟范莉何迟光
Owner COMBA TELECOM SYST CHINA LTD
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