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An elliptical microstrip antenna with shifting of resonant bands using a recessed ground structure

Published online by Cambridge University Press:  15 October 2025

Murari Shaw Open the ORCID record for Murari Shaw [Opens in a new window]
Murari Shaw*
Affiliation:
Department of Electronics & Communication Engineering, Institute of Engineering & Management-Salt Lake, University of Engineering and Management, Newtown, India
*
Email: zmz_shaw@yahoo.co.in
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Abstract

In this research work, a low-profile elliptical microstrip antenna has been designed with a recessed ground structure. A portion of the ground below the substrate has been cut out for the implementation of the recessed ground. Due to the recessed ground, the gain and bandwidth of the conventional antenna are increased along with the shifting of the resonant band toward high-frequency range. First-time theoretical analysis of the recessed ground is performed using a 2-D capacitance model to understand the effect of its dimensions on the dielectric constant of the antenna and the amount of shifting of the primary resonant frequency. A comprehensive parametric study of the dimension of the recessed ground was carried out to optimize the performance of the antenna. The conventional antenna without recessed ground generates a resonant frequency of 2.35 GHz with a resonant band of 2.28–2.4 GHz (S11≤−10dB) and a gain of −1.35 dB. After using optimum rectangular recessed ground, the resonant frequency of the conventional antenna is shifted to 2.58 GHz, occupying the 2.49–2.69 GHz frequency band with 0.5 dB gain. Therefore, the proposed antenna with recessed ground covers the 2.5–2.69 GHz WiMAX application band with enhanced gain and bandwidth.

Keywords

Elliptical patchResonant bandRecessed ground2-D capacitance model

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 11
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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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