Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna |
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| Authors: | Sze J.-Y. Wang J.-C. Chang C.-C. |
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| Affiliation: | Department of Electrical and Electronic Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyang 335, Taiwan; |
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| Abstract: | A novel broadband circularly-polarised (CP) square slot antenna fed by an asymmetric coplanar waveguide (CPW) from a corner of the slot is proposed. A CP bandwidth larger than 10% can be attained simply by using an inverted-L tuning stub protruded from the signal line of the CPW. With an additional pair of grounded strips implanted in the slot, the 3 dB axial-ratio bandwidth and the VSWR ⩽ 2 impedance bandwidth can be greatly raised to be as high as 30 and 35%, respectively. |
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