Abstract
new broadband and dual band circular slot cut modified circular microstrip antenna is analyzed and proposed. The parametric study to analyze the effects of circular slot which realizes broader bandwidth is presented. The circular slot creates two additional resonant modes near the fundamental TM11 mode resonance frequency of the equivalent circular patch and yields bandwidth of 202 MHz (8%). The polarization of the two modes which realizes broadband response was found to be orthogonal, which leads to the principal plane variations over the bandwidth. Further by using this concept, a circular slot cut dual band and dual polarized circular slot cut circular microstrip antenna in 1000 MHz frequency band is proposed. The proposed antenna yields dual frequency response with orthogonal polarization and variable frequency ratio with bandwidth of 2% at the dual frequencies.
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