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Journal of Electromagnetic Waves and Applications Volume 27, 2013 - Issue 15
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Articles

A high selectivity quad-band bandpass filter based on hybrid-coupled microstrip/slotline quad-mode resonator

Hui ChenSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
,
Hong-Fei ZhaoSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
,
Ke-Song ChenSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
,
Y.-H. WuSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
,
Pu TangSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
&
Hong-Sheng ZhongSchool of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
Pages 1902-1909 | Received 21 Apr 2013, Accepted 14 Jul 2013, Published online: 08 Aug 2013
 
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Abstract

A sharp-rejection and high-isolation quad-band bandpass filter with ellipse response using hybrid microstrip/slotline quad-mode resonator is proposed in this paper. The presented composite quad-mode resonator consists of a narrow L-shaped slot in the ground plane and a broadside microstrip L-shaped structure loaded by the two orthogonal narrow-stripline stubs. The dual-metal-plane resonator on a single substrate is employed to obtain a quad-frequency response. Based on this quad-mode resonator, a filter with four passbands centering at 3.86, 6.93, 10.13, and 12.58 GHz is designed, fabricated, and measured. Simulated results from the full-wave electromagnetic software and measured results show a good agreement. The measured inter-band isolations among the quad-frequency passbands with multi-transmission zeros are greater than 22 dB.

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