In this study, a simple broadband circularly polarized (CP) printed monopole antenna for S/C‐band applications is proposed. The CP antenna is composed of a falcate‐shaped monopole with a right‐angle trapezoid stub, then wide impedance and axial ratio (AR) bandwidths are achieved. By placing one rectangular split‐ring resonator above the stub for generating upper CP mode, both of impedance and CP performances are further improved. The proposed antenna is fabricated on a FR4 substrate and measured. The measured −10‐dB impedance bandwidth is 107%, ranging from 2.4‐7.9 GHz, and the measured 3‐dB AR bandwidth is 94% (2.4‐6.6 GHz), covering the entire wireless local area network (WLAN) and WiMAX bands.

中文翻译：

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宽带圆极化印刷f形单极天线

在这项研究中，提出了一种用于S / C波段应用的简单宽带圆极化（CP）印刷单极天线。CP天线由具有直角梯形短截线的镰刀形单极天线组成，因此可以获得宽的阻抗和轴向比（AR）带宽。通过在短截线上方放置一个矩形开口环谐振器以产生较高的CP模式，可以进一步提高阻抗和CP性能。所提出的天线被制造在FR4基板上并进行了测量。测得的−10-dB阻抗带宽为107％，范围为2.4-7.9 GHz，测得的3-dB AR带宽为94％（2.4-6.6 GHz），涵盖了整个无线局域网（WLAN）和WiMAX频段。