volume | PIER Journals

2019-07-15

Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator

Fang-Li Zhao,

Dr. Fang-Li Zhao

School of Information Engineering

Putian University

China

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Min-Hang Weng,

Dr. Min-Hang Weng

Medical devices and opto-electronics equipment department

Metal Industries Research & Development Center

Taiwan

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Chin-Yi Tsai,

Dr. Chin-Yi Tsai

Graduate Institute of Materials Engineering

National Pingtung University of Science and Technology

Taiwan

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Cheng-Xun Lin,

Dr. Cheng-Xun Lin

Graduate Institute of Materials Engineering

National Pingtung University of Science and Technology

Taiwan

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Ru-Yuan Yang

Professor Ru-Yuan Yang

Department of Material Engineering

National Ping-Tung University of Science and Technology

Taiwan

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Progress In Electromagnetics Research Letters, Vol. 85, 137-144, 2019

doi:10.2528/PIERL19041507

Abstract

In this paper, a new dual-band bandpass filter (BPF) using a cross ring resonator is designed. The cross ring resonator is modified from a typical dual-mode ring resonator and has four parallel coupling gaps (g). The resonant modes of the proposed cross ring resonator is investigated first. It is found that the first mode and the second mode can be tuned individually. The filter performances are simulated by using full-wave simulator IE3D. A filter example having two passbands operated at 2.4/5.2 GHz of wireless local area network (WLAN) applications is described to verify the design concept. The fabricated filter has measured characteristics including average insertion losses of 2.0 dB and 1.8 dB and return losses larger than 22 dB and 10 dB for 2.4/5.2 GHz, respectively. Two transmission zeros with high frequency selectivity of 40 dB and 42 dB are obtained near the first passband at 2.2 GHz and 2.7 GHz, respectively. This design is very simple as compared to other design methods, and the measured results prove the design concept of the proposed structure.

Citation

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Fang-Li Zhao, Min-Hang Weng, Chin-Yi Tsai, Cheng-Xun Lin, and Ru-Yuan Yang, "Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator," Progress In Electromagnetics Research Letters, Vol. 85, 137-144, 2019.
doi:10.2528/PIERL19041507

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