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ABSTRACT A novel broadband circularly polarized (CP) C-shaped slot antenna fed by a coplanar waveguide is presented. The broadband CP operation can be achieved simply using a C-shaped slot in the ground to produce orthogonal surface currents for left-hand circular polarization. Using the semicircle-shaped radiator patch, wide impedance bandwidth and broad axial-ratio (AR) bandwidth can be obtained simultaneously. The measured results show that the proposed antenna can provide a 10-dB impedance bandwidth of 105% from 2.78 to 8.92 GHz, and a 3-dB AR bandwidth of 70.4% from 2.9 to 6.05 GHz. Finally, an antenna prototype with a reflector for unidirectional pattern applications is also developed. The proposed antenna has broader impedance and CP bandwidths but with a more compact size compared with the previous designs. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:739-746, 2015. [ABSTRACT FROM AUTHOR]

ABSTRACT A broadband circularly polarized patch antenna with suspended structure is proposed. The suspended patch has a bow-tie structure and a gap-coupled feed. By connecting a resistor load to another gap-coupled feed port at the opposite position, a wide impedance and axial ratio (AR) bandwidths are obtained. The proposed design has a very simple antenna structure with an impedance bandwidth of 44.5% and a 3-dB AR bandwidth of 33.8%, respectively. The results show that the bandwidth of the patch antenna is successfully broadened using the suspended configuration, gap-coupled feed, and resistor loading. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:587-593, 2014. [ABSTRACT FROM AUTHOR]