A Dual-Band Dual-Polarized Coupled Asymmetric T-Shaped Monopole Antenna for Linear and Circular Polarization Applications

A single feed dual-band dual-polarized coupled asymmetric T-shaped microstrip antenna is presented in this paper. The designed antenna involves a coupled asymmetric T-shaped radiating patch that generates mutual coupling to attain wide circular polarized band at higher impedance bandwidth (IBW). A square wide slot with an angle of 45° rotation generates low resonating frequency. In order to maximize the axial ratio (AR), the ground plane and substrate are truncated or cut off from its two opposite right corners. By applying these structures, good circularly polarized performance can be obtained in higher frequency region. The simulated IBW at lower and higher frequency regions is 2.17–2.66 GHz, 20.28% and 7.15–7.78 GHz, 8.43% which are resonating at 2.41 GHz and 7.46 GHz frequencies. The simulated 3 dB axial ratio bandwidth at higher resonating frequency is 7.38–8.3 GHz, 11.73% at center resonating frequency 7.84 GHz. Right-hand circular polarization (RHCP) characteristics are exhibits by using this design. The highest peak gain is 4.31 dBi at 7.4 GHz. The maximum radiation efficiency of this implemented antenna is 95%, and throughout the impedance bandwidth region, the radiation efficiency is greater than 85%. The proposed design in this paper has multiple applications like it can be used for at lower resonating frequency linearly polarized band WiMAX, WLAN application, and higher resonating frequency band can be used for C-band: broadcasting and fixed mobile communication application.