Printed circularly polarized wire antennas with DC grounded stub

Abstract

Two new printed circuit board types double‐folded inverted‐L antennas (DFILAs), which are the horizontal printed DFILA and the vertical printed DFILA, have been proposed.By taking advantage of the printed circuit technologies, the manufacturing processes of the DFILAs can be simplified. The proposed antennas are low profile, lightweight, and simple in structure. Both antennas perform right‐hand circular polarization with center frequency of 2.4 GHz. Both antennas have impedance bandwidths of over 7% (S11<−10dB) and axial ratios of 2.5% (< 3dB). The gains of the two antennas are higher than 6.4 dBi. One of the designs has a simple feeding network with a DC grounded stub, which can improve the impedance matching and provide static discharges for the DFILA. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2719–2725, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27181

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