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A compact microstrip antenna is proposed with very wide bandwidth ranging from 2 to 18 GHz. Impedance bandwidth of 160% is achieved which covers S, C, X, and Ku bands. Antenna gain upto 5 dBi is achieved within the operating band with suppressed cross‐polarized radiation characteristics. The maximum cross‐polarization levels are −28 and −20 dB in E‐plane and H‐plane, respectively. Further, the ground plane of the proposed antenna is embedded with triangular and square defects. Proposed antenna with defected ground plane operates in impedance bandwidth ranging from 2 to 21 GHz and bandwidth is improved to the value of 165.22%. The antenna gain is improved upto the maximum value of 18 dBi within the band of operation. The maximum cross‐polarization levels are improved to the value of −40 and −42 dB in E‐plane and H‐plane, respectively. The measured results are in good match with simulated results for both the antennas.
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Khandelwal et al. (2014) studied this question.
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