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Tunable attenuating diplexer using miniaturized multilayer graphene pads

Published online by Cambridge University Press:  03 February 2025

Sai Haranadh Akkapanthula Open the ORCID record for Sai Haranadh Akkapanthula [Opens in a new window]  and
Srujana Kagita
Sai Haranadh Akkapanthula*
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Tirupati, Yerpedu, India
Srujana Kagita
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Tirupati, Yerpedu, India
*
Corresponding author: Sai Haranadh Akkapanthula; Email: ee22d001@iittp.ac.in
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Abstract

In this article, a coupled line diplexer (operating at 2.4 GHz and 3.5 GHz) which can be used as single-band filter with tunable attenuation characteristics in the pass band has been designed. Multilayer graphene (MLG) pads are used to achieve tunable features in this circuit. The graphene pads are placed at each branch of the diplexer. Single-band tunable attenuation characteristics are achieved by applying bias to graphene pads placed at optimum locations on the filter. The proposed tunable coupled line attenuating diplexer is realized on FR-4 glass epoxy substrate of thickness 1.58 mm with a total size of 45 × 75 mm2. By varying the bias voltage (0 V –6 V) of MLG pads the resistance of graphene pad placed in the circuit gets decreases thereby attenuating/controlling the transmission power to the other port in the required band. In lower pass band (2.28–2.55 GHz) the signal is attenuated from 3 to 10.8 dB and in higher pass band (3.2–3.58 GHz) signal is attenuated from 5 to 13 dB. Simulations of the structure with and without graphene pads have been carried out and are in good agreement with measured results.

Keywords

coupled line filterdiplexermultilayer graphenetunable attenuatorvoltage bias
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 8
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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