ORIGINAL RESEARCH article
Front. Phys.
Sec. Interdisciplinary Physics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1555410
This article is part of the Research TopicRF Multi-Mode Circuit Theory and TechnologyView all articles
Design of a Millimeter-wave Wideband Filtering Balun in GaAs IPD Technology
Provisionally accepted
- Nanjing Normal University, Nanjing, China
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This article introduces a novel millimeter-wave filtering balun design that leverages a wavelength transmission line to achieve phase inversion, and coupling structures to enable broadband coverage and enhanced frequency selectivity. An Integrated-Passive-Device (IPD) balun prototype, based on a GaAs substrate, was designed, fabricated and tested to validate its bandwidth and phase inversion properties. The prototype balun features a center frequency of 45.6 GHz, a relative bandwidth of 59.2%, and a phase difference of 180 °( ± 7.0 °) between its two outputs. This compact design could be easily integrated and offers broad bandwidth coverage with exceptional frequency selectivity, thereby presenting promising applications in modern miniaturized communication systems.
Keywords: balun, wideband, Integrated-Passive-Device technology, Filtering response, GaAs
Received: 04 Jan 2025; Accepted: 29 May 2025.
Copyright: © 2025 Li, Ni, Li, Han, Tian, Li and Ma. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Tianye Ma, Nanjing Normal University, Nanjing, China
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