Abstract
A low-profile circularly polarized stacked patch antenna with U-slots was designed, fabricated, and measured at 240–300 MHz for satellite and communications applications. U-slots on the driven patch are proposed, and its design is optimized to improve the bandwidth of the antenna. In addition, the −10 dB return loss has been compromised in favor of a wider, stable, and acceptable performance bandwidth. The proposed antenna has a size of $0.36\lambda _{c} \times 0.36\lambda _{c} \times 0.035\lambda _{c}$ . A bandwidth of 22% and gain of 3.5 dBiC with axial ratio below 2.5 dB are achieved in the 240–300 MHz band.
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