Design of compact balanced filters with wide DM upper stopband and CM rejection band based on semi‐circular patch-Reference-Cited by-同舟云学术

Design of compact balanced filters with wide DM upper stopband and CM rejection band based on semi‐circular patch

Published:2024-03 Issue:3 Volume:66 Page:
ISSN:0895-2477
Container-title:Microwave and Optical Technology Letters
language:en
Short-container-title:Micro & Optical Tech Letters

Author:

Wang Xuedao¹²,Guo Zai‐Cheng³⁴,Huang Feng⁵,Wang Jianpeng²,Wang Lingling¹

Affiliation:

1. School of Electronic and Information Engineering Jinling Institute of Technology Nanjing China

2. School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing China

3. School of Electrical and Automation Engineering Nanjing Normal University Nanjing China

4. The Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China

5. College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications Nanjing China

Abstract

AbstractA new design approach to achieve compact size and high common‐mode (CM) suppression of balanced filters is proposed with two back‐to‐back microstrip semi‐circular patch resonators. In feeding structures, metalized via holes are adopted to vertically feed patches by differential pairs. Then, TM11 mode is excited and TM31 mode can be rejected, resulting in wideband differential‐mode (DM) harmonic rejection. Besides, with a slotline etched in the common ground plane, desired coupling strength can be achieved for a target bandwidth. Meanwhile, by virtue of the stacked structure, source‐load coupling can be easily introduced to generate transmission zeros close to the passband. With theory guidance, two balanced filter prototypes centered at 2.4 GHz are designed. Simulation and measurement results both indicate that proposed balanced filters exhibit high DM and CM performances as well as a compact size about 0.26λg × 0.53λg.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Link

https://onlinelibrary.wiley.com/doi/pdf/10.1002/mop.34108

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