Home Wideband Inverted-L Microstrip-via-Fed Circularly Polarized Antenna with Asymmetrical Ground for WLAN/Wimax Applications
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Wideband Inverted-L Microstrip-via-Fed Circularly Polarized Antenna with Asymmetrical Ground for WLAN/Wimax Applications

  • Qiang Chen EMAIL logo , Hou Zhang , Lu-chun Yang , Bin-bin Li and Xue-liang Min
Published/Copyright: November 22, 2017
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Abstract

A design with wideband and circularly polarized radiation antenna from an open-slot antenna has been demonstrated in this paper. The proposed antenna, which consists of an open slot and an inverted-L strip feeding, provides a large bandwidth, which completely cover the Wimax (3.3–3.8 GHz) and WLAN (2.4–2.48 GHz) bands. The open slot is formed by an modified ground plane with a slit cut and monofilar spiral stubs employed, which fed by an asymmetrical inverted-L strip feedline using a via. As demonstrated, the CP operation was significantly improved by loading monofilar spiral stubs connected to the asymmetric feedline by means of a via. A parametric study of the key parameters is made and the mechanism for circular polarization is described. After optimization, the impedance bandwidth is approximately 3.78 GHz (2.12 to 5.9 GHz) and the 3 dB axial ratio bandwidth is approximately 2.75 GHz (2.2 to 4.95 GHz), which represent fractional bandwidths of approximately 94.3 % and 76.9 %, respectively.

Acknowledgment

This work is supported by the National Natural Science Foundation of China (Grant No. 61372034) and the Aeronautical Science Foundation of China (Grant No. 20140196001). The authors would also like to thank the China North Electronic Engineering Research Institute for the fabrication.

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Received: 2017-04-13
Published Online: 2017-11-22
Published in Print: 2018-06-26

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