一种新型多模三通带滤波器

doi:10.3969/j.issn.1001-2400.2015.03.007

J4 ›› 2015, Vol. 42 ›› Issue (3): 38-42+96.doi: 10.3969/j.issn.1001-2400.2015.03.007

• Original Articles • Previous Articles Next Articles

Design of a novel multiple-mode tri-band bandpass filter

LIN Lei;SUN Shoujia;WU Bian;LIANG Changhong

(Science and Technology on Antenna and Microwave Lab., Xidian Univ., Xi'an 710071, China)

Received:2014-02-19 Online:2015-06-20 Published:2015-07-27
Contact: LIN Lei E-mail:yeslinlei@gmail.com

Abstract

Abstract:

A compact tri-band microstrip filter based on an MMR (multiple mode resonator) is presented, which consists of an MMR and a pair of feedlines. Firstly, due to the symmetry of the structure, the even-odd-mode method is applied twice to analysis the resonant characteristics. All the six mode frequencies can be freely tuned by changing the lengths of loaded stubs, and all the four modes equivalent circuits are quarter-wavelength resonators, which largely minimize the size of the filter. Secondly, stub to stub coupling is introduced to split two modes and produce two new transmission zeros with the passband selectivity improved. Finally, a microstrip tri-band bandpass filter (BPF) operating at 1.5GHz/2.4GHz/3.5GHz is designed, fabricated and measured. Measured results are in good agreement with the simulated ones.

Key words: multi-mode resonators, tri-band bandpass filter, stub-stub coupling, transmission zeros

CLC Number:

TN713+．5

LIN Lei;SUN Shoujia;WU Bian;LIANG Changhong. Design of a novel multiple-mode tri-band bandpass filter[J].J4, 2015, 42(3): 38-42+96.

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Design of a novel multiple-mode tri-band bandpass filter

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