Circularly polarized hexagonal ring microstrip patch antenna with asymmetrical feed and DGS

• Published in: Microwave and optical technology letters Vol. 62; no. 4; pp. 1702 - 1708
• Main Authors: Maurya, Rakesh Kumar, Kanaujia, Binod K., Gautam, A. K., Chatterji, S., Singh, Anil Kumar
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-04-2020; Wiley Subscription Services, Inc
• Subjects: Antennas; asymmetrical feed; Asymmetry; Circular polarization; circularly polarized; defected ground structure; Ground plane; hexagonal ring microstrip patch antenna; Microstrip antennas; microstrip‐line feed; Network analysers; Patch antennas; Ultrawideband
• ISSN: 0895-2477; 1098-2760
• DOI: 10.1002/mop.32220

A novel circularly polarized hexagonal ring microstrip patch antenna with asymmetrical feed is proposed for S, C, and X‐band applications. A semi‐arc‐shaped slot is integrated into the ground plane, and the hexagonal ring is tilted by an angle of 25° with respect to the microstrip‐line feed (asymmetric), which creates a circularly polarized UWB. The simulation of the proposed antenna is carried out using Ansoft HFSS v.13 and the measurement is done with an N5230A vector network analyzer. The simulated and the measured results of our proposed antenna are in good agreement. The successful implementation of the asymmetrical feed shows a broader impedance bandwidth of 134% (B.W = 9.55 GHz) from 2.34 to 11.89 GHz at 7.12 GHz of the center frequency. The 3‐dB axial ratio B.W is 2.8% (7.1‐7.3 GHz) and 21.8% (9.8‐12.2 GHz) in the UWB range. The average gain of the proposed antenna is 4.15 dBi. Good RHCP waves are also found in the x‐z and y‐z planes. The proposed antenna can be effectively used in S, C, and X‐band applications.