Abstract
ABSTRACTA circularly polarized Y‐shaped monopole antenna with L‐shaped slot loaded ground‐plane is proposed in this letter. The multi‐band operation is achieved due to the resonances of asymmetrical monopole arms as well as the slot in the ground plane. The circular polarization for LTE (band‐7, 2600 MHz) is achieved by using orthogonal and out of phase currents on surface of Y shaped monopole, whereas circular polarization for GNSS and UMTS‐2100 bands is the result of interaction of currents on longer arm of Y shaped monopole and loop currents on ground, which acts as a magnetic monopole. The antenna has been designed and optimised on a low cost FR‐4 epoxy substrate. The proposed antenna exhibits impedance bandwidths of 13.1, 9.7, and 7.4% at the resonant frequencies of 1.57, 2.02, and 2.55 GHz, respectively. At these three resonances, 3 dB axial ratio bandwidths of 3.7, 4.9, and 5.06% are achieved. The antenna has dual sense circular polarization, bidirectional radiation patterns, stable gain and good efficiency in the operating bands. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:298–304, 2017
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