It has been demonstrated that by embedding suitable slots in the antenna's radiating patch, compact microstrip antennas can be obtained. However, for such designs, the antenna gain and impedance bandwidth are also decreased, causing severe limitations for practical applications. In this paper, we propose a new design of compact microstrip antennas with a slotted ground plane. It is found that by properly embedding a pair of narrow slots in the ground plane of a microstrip antenna, lowering of the antenna's fundamental resonant frequency can be obtained. Reduced antenna size at a fixed frequency can thus be achieved for the proposed design. Moreover, enhanced bandwidth and gain for the proposed design are also observed, which is different from that observed for the compact designs with a slotted radiating patch [1], [2]. The proposed design with two pairs of narrow slots in the ground plane for achieving dual polarized or circularly polarized radiation has also been successfully implemented. Details of the experimental results are presented.
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