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Four square loops antenna for circular polarisation and gain enhancement

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7 Author(s)
Yang, Q. ; Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi'an, China ; Zhang, X. ; Bai, X. ; Wang, N.
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A four square loops antenna above a finite ground plane is investigated for circular polarisation and gain enhancement. By choosing proper perimeters of the two pairs of loops, the axial ratio (??3 dB) bandwidth can reach 16%. It is demonstrated that a new pair of loops added to the original dual-loop can increase the gain to 11.6 dBic. A broadband balun is incorporated for impedance matching. The antenna performance is confirmed by experimental results.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 7 )