Dual-Mode Filter with High Design Flexibility Using Short-Loaded Resonator

Authors

  • Zhaojun Zhu School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China
  • Ke Yang School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China
  • Xiufeng Ren School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China
  • Lu Cao School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China

Keywords:

Bandpass filter, dual-mode resonator, odd and even-mode theory, tri-band filter

Abstract

This work presents a series of independent bandpass filters (BPFs) based on dual-mode resonators (DMRs) with short stub-loaded. BPFs conform to the 802.11n protocol and include three passbands with center frequencies and bandwidths of 2.46 GHz, 3.55 GHz and 5.22 GHz, 130 MHz, 130 MHz and 470 MHz. Insertion loss and reflection loss are 1.5 dB, 1.6 dB and 1.3 dB, 18 dB, 20 dB, 30 dB. The filters are useful in the WLAN/WIMAX applications with compact size. According to the current distributions along the resonator, the feed-lines with high design flexibility arms were introduced in order to supply the needed external coupling for the dual-/tri passbands simultaneously, and achieve good impedance matching in each passband. Finally, by the version 15 of High Frequency Structure Simulator (HFSS), three BPFs with single, dual and triple passbands were designed on the Rogers 5880 substrate with the relative dielectric constant ɛr = 2.2, substrate loss tanδ = 0.002, and the thickness h = 0.508 mm. The BPFs are measured by Agilent 85058E Vector Network Analyzer (VNA). The measured results have good agreement with the simulated ones.

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Author Biographies

Zhaojun Zhu, School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China

Zhaojun Zhu was born in Sichuan, China, in 1978. He received the B.S. degree and the Ph.D. degree in Physical Electronics in University of Electronic Science and Technology of China (UESTC), Chengdu, in 2002 and 2007 respectively. Since 2012, he has been an Associate Professor with the UESTC. His research interests include the design of microwave and millimeter-wave circuits.

Ke Yang, School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China

Ke Yang was born in Shannxi, China, in1996. He received the B.E. degree in Communication Engineering in Xian University of Science and Technology in 2019, and is working toward the M.A. Eng. degree in UESTC. His research interests include millimeter-wave circuit and phased array wave control algorithm design.

Xiufeng Ren, School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China

Xiufeng Ren was born in Shandong, China, in1995. She received the B.E. degree in Communication Engineering in China University of Petroleum in 2018, and is working toward the M.A. Eng. degree in UESTC. Her research interests include antenna design and phased array wave control algorithm design.

Lu Cao, School of Physics University of Electronic Science and Technology of China, Chengdu, 610054, China

Lu Cao was born in Jiangxi Province, China, in 1993. She received the B.S. degree in Physics from Gannan Normal University, in 2015, and M.D. degree in UESTC in 2018. Her research interests include the design of microwave and millimeterwave circuits.

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Published

2021-02-01

How to Cite

[1]
Zhaojun Zhu, Ke Yang, Xiufeng Ren, and Lu Cao, “Dual-Mode Filter with High Design Flexibility Using Short-Loaded Resonator”, ACES Journal, vol. 36, no. 2, pp. 199–204, Feb. 2021.

Issue

2021: Vol 36 Iss 2

Section

Articles