This paper presents the design and performance analysis of a compact rectangular microstrip patch Yagi-Uda antenna for amateur radio (HAM) applications operating at 5.75 GHz in the ultra-high frequency (UHF) band. The proposed antenna is fabricated on the RT/Duroid 5880 substrate with a dielectric constant of 2.2, thickness of 1.575 mm and loss tangent of 0.0009 with low dielectric losses and high radiation efficiency. The antenna design consists of a driven element, a reflector and five directors. Simulation is carried out using CST Microwave Studio and the optimized antenna shows a return loss of -62.24 dB, VSWR near to unity (1), a gain of 8.39 dBi, a beamwidth of 59.7° and an efficiency of 89.62% at the resonant frequency of 5.75 GHz. The antenna offers a bandwidth of 200 MHz (5.65-5.85 GHz) with stable radiation characteristics, making it highly suitable for compact HAM radio transceivers and UHF communication systems.

A compact 65x120mm2of microstrip patch Yagi-Uda antenna is designed at 5.75GHz for amateur radio applications. The RT/Duroid 5880 substrate is used with a dielectric constant of 2.2 and height of 1.575mm. The proposed antenna contains a driven element, 5 directors and a reflector. Only five directors used in this design. Because when 6th director was designed, due to the impedance mismatch, the gain value started decreasing. An electromagnetic solver software called CST Microwave Studio is used to study the performance of the simulated results. The designed antenna produced a gain of 8.39 dBi, Directivity of 8.86 dBi, Return Loss of -62.24 dB, VSWR of 1.001 and beamwidth of 59.7˚ at center frequency. 200 MHz (5.65 GHz to 5.85 GHz) of Bandwidth is covered. The side lobe level is -20.8 dB and achieved efficiency is 89.62%. The future work will be fabricating and testing of the proposed antenna. Also, the comparison between the simulated and fabricated work for further improvement.

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