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A compact, broadband three-way substrate integrated waveguide power divider with improved isolation

Arun Kumar Gande (Department of Electronics and Communication Engineering, National Institute of Technology Warangal, Warangal, India)
Souma Guha Mallick (Department of Electronics and Communication Engineering, Supreme Knowledge Foundation Group of Institutions, Chandannagar, India)
Bijit Biswas (Circuits and Systems Division, Society for Applied Microwave Electronics Engineering and Research, Kolkata, India)
Sayan Chatterjee (Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata, India)
Dipak Ranjan Poddar (Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata, India)

Circuit World

ISSN: 0305-6120

Article publication date: 26 July 2021

Issue publication date: 24 November 2022

152

Abstract

Purpose

This paper aims to present a compact, broadband substrate integrated waveguide (SIW) three-way power divider with improved isolation based on six-port SIW coupler.

Design/methodology/approach

The power coupling among the three output ports occurs due to short openings in the narrow walls of the central SIW channel. Performance improvement in the isolation and return loss among ports is achieved using matching posts placed at the input and output ends of the coupling region. This enhances the coupling between TE10 and TE30 modes. The input matching ports enhance the return loss, whereas the isolation is alleviated by both the input and output matching posts. The bandwidth enhancement is achieved by optimizing the outer SIW channel widths.

Findings

The measured fractional bandwidth of 27.3% with over 15 dB of isolation and return loss is achieved. The coupling length is 1.55 λg at the centre frequency. The power divider achieves better than 15 dB isolation between non-adjacent output ports. The measured reflection and isolation coefficients are in close agreement with simulated results over 8.2 to 10.8 GHz.

Practical implications

Isolation between the adjacent and non-adjacent ports is an important parameter as the reflections from these ports will interfere with signals from other ports reducing the fractional bandwidth of the power divider and affecting the overall performance of the transmitters and receivers.

Originality/value

The authors present the enhancement of isolation between the output non-adjacent ports by optimizing the SIW channel width and matching post in the coupling region to reduce the reflected signals from non-adjacent ports entering into other ports. To the author’s knowledge, this is the only SIW three-way power divider paper showing non-adjacent port isolation among six-port couplers based three-way power dividers.

Keywords

Citation

Gande, A.K., Guha Mallick, S., Biswas, B., Chatterjee, S. and Poddar, D.R. (2022), "A compact, broadband three-way substrate integrated waveguide power divider with improved isolation", Circuit World, Vol. 48 No. 4, pp. 580-585. https://doi.org/10.1108/CW-04-2020-0074

Publisher

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Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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