CPW‐fed C‐shaped slot antenna for broadband circularly polarized radiation |
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| Authors: | Kang Ding Cheng Gao Tong‐bin Yu De‐xin Qu |
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| Affiliation: | 1. National Key Laboratory on Electromagnetic Environmental Effects and Electro‐optical Engineering, Department of Engineering, PLA University of Science and Technology, Nanjing, China;2. Department of Communications Engineering, PLA University of Science and Technology, Nanjing, China |
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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. |
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| Keywords: | broadband antenna circularly polarized coplanar waveguide slot antennas unidirectional patterns |
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