Design of CPW fed f-shaped circularly polarized antenna for amateur radio vehicular communications


  • T V. Ramakrishna
  • B T.P. Madhav
  • D Amulya
  • S Sumitra
  • A Sai Kumar
  • M Rohit
  • T Anilkumar





Amateur Radio, Asymmetric Ground, Axial Ratio (AR), Circular Polarization, Closed CPW Ground, F-Shaped Monopole.


In this paper a compact circularly polarized antenna is proposed to operate in X-band spectrum. The F-shaped monopole element is used as the radiating structure and the closed coplanar-waveguide ground is used on a FR4 substrate. The proposed feeding mechanism with asymmetric ground planes and the three rectangular strips connected to the feed line. The proposed antenna operates with a -10dB reflection coefficient bandwidth from 9.3 GHz to 13 GHz and the circular polarized performance is attained from 9.8 GHz – 11.2 GHz with axial ratio less than 3dB (AR < 3dB). The antenna gain in the boresight direction is found to be achieved as 4.34dB and radiates with a maximum efficiency of 90% which is suited for amateur radio applications in X-band spectrum based vehicular communications.


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