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

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

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

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