Abstract
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 super-wide 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 $0.073{\lambda _0}$ and $0.275{\lambda _0}$ , respectively ( ${\lambda _0}$ is the wavelength in free space). The impedance bandwidth for ${\rm VSWR} \leq 2 $ reaches 22.4%, and the AR bandwidth for ${\rm AR}\leq3 \hbox{dB}$ 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 ${\rm AR} \leq 3 \hbox{dB} $ can cover more than 180°.
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