Abstract
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°
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