Impact of Substrate Material on The Performance of Circular Loop Patch Antenna with Partial Ground

Abstract

This articles outline the design of a circular loop antenna aimed to millimetre wave applications operating within the frequency range of 20 GHz to 55 GHz. A multi-objective function for the antenna has been established on a substrate measuring 14mm x 14mm x 1.6mm to optimize both its bandwidth and gain. The antenna design utilizes Rogers RT/duroid 5870 dielectric material, which has a dielectric constant (ε_r) of 3.55 and a loss tangent (δ) of 0.0027. Following the successful optimization of the antenna, its performance is evaluated through the assessment of return loss is -29.8 dB, VSWR is 0.56 dB and Gain is 6.62 dB characteristics with a partial ground plane. Finally, after achieving the specified objectives, a radiation characteristics analysis is performed to explore the antenna's radiation properties. This study illustrates how the choice of substrate material influences the performance metrics of the antenna, including radiation pattern, gain, directivity, and VSWR [8].