Design of Wideband SPDT RF Switch Using Switchable DGS for Sustainable Wireless Systems

Authors

DOI:

https://doi.org/10.26877/asset.v7i4.1957

Keywords:

Bandstop response, isolation, millimeter-wave, SPDT switch, switchable DGS, sustainable RF front-end system, wideband telecommunication

Abstract

This paper presents a single-pole double-throw (SPDT) switch that is integrated with a thin rectangular patch switchable defected ground structure (DGS). It is a novel technology for obtaining wideband and high isolation for the SPDT switch in millimeter-wave (mm-wave) telecommunications due to the usage of switchable DGS with bandstop and bandwidth enhancement capabilities. A wideband and high isolation are required for the switchable DGS SPDT switch to operate optimally in mm-wave frequency ranges, as well as to reduce the effect of leakage signal on both the transmitter and receiver connected to the SPDT switch and hence improve system efficiency and signal integrity. The SPDT switch design was combined with two small rectangular patches switchable DGSs that could switch between bandstop and allpass responses using biasing diodes on the DGS. As a result, the suggested SPDT switch with the switchable DGS had 6 dB of insertion loss and high isolation of more than 25 dB with wideband isolation of 25.24% fractional bandwidth, which was consistent with the simulation results. Furthermore, the isolation magnitude is doubled compared to the conventional SPDT switch. This work demonstrates that integrating switchable DGS into discrete SPDT switches provides a practical solution for realizing wideband, high-isolation performance suitable for 5G mm-wave where compactness and bidirectional reconfigurability is increasingly essential for sustainable RF front-end systems.

Author Biographies

  • Adib Othman, Universiti Teknikal Malaysia Melaka

    Fakulti Teknologi dan Kejuruteraan Elektronik dan Komputer & Centre for Telecomunication Research & Innovation, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal, Melaka, 76100, Malaysia

  • Noor Azwan Shairi, Universiti Teknikal Malaysia Melaka

    Fakulti Teknologi dan Kejuruteraan Elektronik dan Komputer & Centre for Telecomunication Research & Innovation, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal, Melaka, 76100, Malaysia

  • Huda A Majid, Universiti Tun Hussein Onn Malaysia

    Fakulti Teknologi Kejuruteraan, Universiti Tun Hussein Onn Malaysia, Hub Pendidikan Tinggi Pagoh, Muar, Johor, 84600, Malaysia

  • Faiz Asraf Saparudin, Universiti Tun Hussein Onn Malaysia

    Fakulti Teknologi Kejuruteraan, Universiti Tun Hussein Onn Malaysia, Hub Pendidikan Tinggi Pagoh, Muar, Johor, 84600, Malaysia

  • Zahriladha Zakaria, Universiti Teknikal Malaysia Melaka

    Fakulti Teknologi dan Kejuruteraan Elektronik dan Komputer & Centre for Telecomunication Research & Innovation, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal, Melaka, 76100, Malaysia

  • Najib Al-Fadhali, Alfred State College of Technology, State University of New York

    Electrical Engineering Technology Alfred State College of Technology, State University of New York, 10 Upper College Drive Alfred, New York, 14802, USA

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Published

2025-10-30

Issue

Vol. 7 No. 4 (2025): August-October

Section

Articles