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A new perturbing method of utilizing a crossed ground slot is proposed for a right-handed circularly polarized (RHCP) microstrip antenna for GPS L1 band of 1.575 GHz. The crossed-slot at the ground plane and equally-divided perpendicular feed structure yields two orthogonal frequencies with the 90-degree phase difference. As a result, the TM10 and TM01 modes for the right-handed circularly polarized...
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