The letter presents a compact circularly polarized (CP) microstrip antenna for airborne communications. The antenna adopts a square radiation patch with a cross slot to reduce the antenna dimensions and improve the impedance matching. For the high radiation efficiency of the proposed antenna, the no-resistor series feeding network is utilized to construct the antenna. In addition, the proposed structure also brings a superwide beamwidth in axial ratio (AR) radiation patterns. To confirm the performances of the novel structure, an L-band prototype of the antenna is manufactured and tested. The thickness and the side length of the antenna are 0.073λ0and 0.275λ0, respectively (λ0is the wavelength in free space). The impedance bandwidth for VSWR ≤ 2 reaches 22.4%, and the AR bandwidth for AR ≤ 3 dB reaches 6.8%. In the overlap band, the radiation efficiency of more than 97% and the gains of more than 5.2 dBic are obtained. Especially, the beamwidth for AR ≤ 3 dB can cover more than 180°.
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Chen et al. (2016) studied this question.
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