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Broadband CPW-Fed Circularly Polarized Square Slot Antenna With Lightening-Shaped Feedline and Inverted-L Grounded Strips

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4 Author(s)
Jia-Yi Sze ; Electr. & Electron. Eng. Dept., Nat. Defense Univ., Taoyuan, Taiwan ; Hsu, C.-I.G. ; Zhi-Wei Chen ; Chi-Chaan Chang

A novel design is described for a circularly polarized square slot antenna (CPSSA). Circular polarization (CP) operations can be attained using a lightening-shaped feedline protruded from the signal line of the feeding coplanar waveguide (CPW). The CP bandwidth can be significantly enhanced by implanting a pair of inverted-L grounded strips into the slot and adjusting the dimensions of the lightening-shaped feedline, whereas the impedance bandwidth can be greatly enlarged through tuning embedded vertical and horizontal stubs. The designed antenna was measured to exhibit a CP bandwidth of as high as 48.8%.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:58 ,  Issue: 3 )