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Ultracompact isolated multilayer broadside-coupled balun with arbitrary isolation bandwidth

Published online by Cambridge University Press:  04 November 2024

Masoud Farhadinia ,
Shokrollah Karimian Open the ORCID record for Shokrollah Karimian [Opens in a new window]  and
Esfandiar Mehrshahi
Masoud Farhadinia
Affiliation:
School of Electrical Engineering, Shahid Beheshti University
Shokrollah Karimian*
Affiliation:
School of Electrical Engineering, Shahid Beheshti University
Esfandiar Mehrshahi
Affiliation:
School of Electrical Engineering, Shahid Beheshti University
*
Corresponding author: S. Karimian; Email: s_karimian@sbu.ac.ir
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Abstract

An isolated low-profile multilayer all-ports-matched broadside-coupled balun (BCB) with arbitrary isolation bandwidth is presented. Analytical relations are derived and provided for the isolation circuit (IC) design in terms of electrical and physical parameters. Accordingly, instructions are given on obtaining optimum bandwidth and isolation responses for the IC. Design procedure for the BCB is presented together with a case study for power amplifier application. The BCB is validated theoretically, analytically, and experimentally, and results are in good agreement. The fabricated balun has insertion loss of 0.27 dB, input and output return losses of 19 dB, isolation of 20 dB at fc, and phase and magnitude imbalance better than 2° and 0.2 dB across the Bandwidth (BW), respectively. The realized isolated balun has dimensions of 0.06λg × 0.03λg.

Keywords

impedance transformationmultilayer broadside-coupled balunpower combiners/dividerspush-pull amplifierswideband isolation circuit
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Issue 8 , October 2024 , pp. 1355 - 1363
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with The European Microwave Association.

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