A new antenna structure comprises of defected ground structure with hook‐shaped radiating patch designed for broad impedance bandwidth and axial ratio bandwidth is presented. In the proposed design, hook shaped radiating patch is orthogonally connected with printed strip patch and excited with 50Ω feed line at the upper side of the substrate. At the bottom side, a small rectangular slit is removed from the ground plane just underneath of radiating patch for better impedance matching along with broader bandwidth. The ground plane is defected by etching 3 symmetrical narrow slots for antenna compactness. The optimized antenna prototype is simulated, fabricated, and experimentally tested for far field and axial ratio performances in anechoic chamber. The measured results clearly show that it can yield an impedance bandwidth of approximately 27.60% centered at 2.17 GHz frequency and a 3‐dB AR bandwidth of approximately 25.20%. The measured gain range from 3 to 4.3 dBic in entire 3‐dB AR bandwidth with maximum gain of 4.30 dBic. The cross polar suppression was witnessed better than 15 dB along with wide beamwidth of 85°
in this paper, a novel antenna design comprising planar monopole with fractal slot defected ground structure for circularly polarized radiation is proposed. In the proposed antenna geometry, circular polarization radiation characteristics are obtained by defecting the ground structure with fractal slot. In this approach, CP characteristics are achieved by intensifying the level of cross polar component of the linearly polarized antenna upto a certain level by means of fractal slot inserted in ground structure. Antenna prototype with third order iterative tuning fork shaped fractal slot is fabricated and tested for the validation of simulated results. Parametric studies are also performed to exemplify the process of CP radiations. From the simulated and measured results, it is confirmed that the proposed antenna can be proficiently produced 10 dB return loss bandwidth (BW) nearly ≈ 37.4%, while 3-dB AR bandwidth (ARBW) is 15.5%, respectively. The proposed antenna can be a credible applicant for LTE Band 13/ cellular/ PCS /ASW/ WiMAX and Wi-Fi applications. INDEX TERMS Circular polarization, Axial ratio bandwidth (ARBW), Modified ground structure (MGS), fractal structure, Planar Monopole CP Antennas.
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