Compact Bandpass Filter for Ultra-wide Stopband Rejection

作者

  • Pritha Narayanan Faculty of Information and Communication Engineering Anna University, Chennai 600025, Tamil Nadu, India, Department of Electronics and Communication Engineering Panimalar Engineering College, Chennai 600123, Tamil Nadu, India
  • Maheswari Shanmugam Department of Electronics and Communication Engineering Panimalar Engineering College, Chennai 600123, Tamil Nadu, India

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https://doi.org/10.13052/2024.ACES.J.400706

关键词:

Asymmetric-short, bandpass filter, middle-short, stepped impedance resonator

摘要

The design objectives for a bandpass filter intended for modern wireless applications include achieving wide stopband attenuation and preserving signal strength within the passband. The proposed architecture aims to provide an effective solution for WLAN systems by minimizing insertion loss while sustaining other essential performance parameters. An asymmetric-short to the stepped impedance resonator (ASSIR) bandpass filter is presented. The second-order end coupled filter is initially designed, and transmission zeros and resonance frequencies are mathematically derived using ABCD parameters and odd and even mode calculations, respectively. A middle-short is introduced to the resonators to increase the depth of transmission zeros at the band edges. Further, an asymmetric-short to the resonators, along with stubs at the feed lines, is incorporated to realize an ultrawide stopband until 12.8 GHz and also to achieve compactness of 0.3λg×0.18λg without modifying the structure. The low-cost FR4 substrate ϵr=4.4, simple end-coupled ASSIR bandpass filters is mathematically verified, simulated and measured at 2.45 GHz with an in-band low insertion loss of 1.4 dB.

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Pritha Narayanan received the M.E. degree in Applied Electronics from Sathyabama Institute of Science and Technology, Chennai, India, in 2013. She received the B.E. degree in ECE from Adhiparasakthi College of Engineering, Anna University. She is working as an Assistant Professor in the Department of Electronics and Communication Engineering at Panimalar Engineering College, specializing in RF and microwave engineering. Her research focuses on developing novel bandpass filter design for microwave and mm wave applications. She has published over 15 peer-reviewed articles in the field of ECE.

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Maheswari Shanmugam received the Ph.D. degree in Microwave Engineering and M.E. degree in Applied Electronics from Sathyabama Institute of Science and Technology, Chennai, India, in 2016 and 2009, respectively. She received the B.E. degree in ECE from the University of Madras. Her area of research includes microwave and millimeter wave circuits. She has more than two decades of teaching experience. Currently she is working as a Professor in Panimalar Engineering College, Chennai. She is a recognized supervisor for doing research in Anna University. She has published more than 30 papers in Web of science, Scopus indexed journals and IEEE conferences. She is a Fellow of IETE.

参考

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已出版

2025-07-30

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[1]
P. . Narayanan 和 M. . Shanmugam, 《Compact Bandpass Filter for Ultra-wide Stopband Rejection》, ACES Journal, 卷 40, 期 07, 页 617–626, 7月 2025.

期

2025: Vol 40 Iss 7

栏目

General Submission

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