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Comparative View of Return Loss, VSWR, Gain, and Efficiency of Cylindrical Surrounding Patch Antenna with Frequency Shift

Erhiega N. Umayah and Viranjay M. Srivastava
Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban – 4041, South Africa
Abstract—In this research work, the return loss (S-parameter, S11), Voltage Standing Wave Ratio (VSWR), gain, and efficiency of a compact and flexible Cylindrical Surrounding Patch Antenna (CSPA) have been derived from Rectangular Planar Patch Antenna (RPPA) for applications in the Industrial, Scientific and Medical (ISM) frequency band. For ease of bending, the radiating patch was stablished on surface of the cylindrical substrate (ploymide) of thickness 1.2 mm. It is flexible and has permittivity (εr) 3.5, permeability (μr) 1, and loss tangent (tanz1 ) 0.0027. The RPPA was made conformal into cylindrical shapes at an angle of 90º and radius of curvature (r) ranging from 10 mm to 35 mm in steps of 5 mm to achieve the best return loss and gain. Results for the optimal performance parameters have been presented for CSPA and RPPA at 2.371 GHz and 2.4 GHz, respectively. Results show that for the CSPA S11, VSWR, and gain are -17.734 dB, 1.2984, and 4.52 dBi, respectively (with better angular coverage) compared to RPPA which has -11.969 dB, 1.6741, and 5.74 dBi, respectively. 
 
Index Terms—conformal patch antennas, cylindrical surrounding patch antenna, ISM application, radiation pattern, return loss

Cite: Erhiega N. Umayah and Viranjay M. Srivastava, "Comparative View of Return Loss, VSWR, Gain, and Efficiency of Cylindrical Surrounding Patch Antenna with Frequency Shift," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 8, No. 6, pp. 352-357, November 2019. Doi: 10.18178/ijeetc.8.6.352-357
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