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Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna

Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna

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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.

References

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      • Y.B. Chen , X.F. Liu , Y.C. Jiao , F.S. Zhang . CPW-fed broadband circularly polarised square slot antenna. Electron Lett. , 19 , 1074 - 1075
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      • L.Y. Tseng , T.Y. Han . Microstrip-fed circular slot antenna for circular polarization. Microw. Opt. Technol. Lett. , 4 , 1056 - 1058
    3. 3)
      • J.Y. Sze , K.L. Wong , C.C. Huang . Coplanar waveguide-fed square slot antenna for broadband circularly polarized radiation. IEEE Trans. Antennas Propag. , 8 , 2141 - 2144
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      • R.P. Xu , X.D. Huang , C.H. Cheng . Broadband circularly polarized wide-slot antenna. Microw. Opt. Technol. Lett. , 5 , 1005 - 1007
    5. 5)
      • I.C. Deng , J.B. Chen , Q.X. Ke , J.R. Chang , W.F. Chang , Y.T. King . A circular CPW-fed slot antenna for broadband circularly polarized radiation. Microw. Opt. Technol. Lett. , 11 , 2728 - 2733
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