An Inflatable Wideband Stacked Microstrip Antenna with Circular Polarization

In this letter, a concept of inflatable wideband stacked microstrip antenna with circular polarization is proposed. The stacked antenna is consists of two layers of substrates including rectangular patches with triangle cuts and air gap with inflatable structure as a median layer. Simulated result shows that -10 dB impedance bandwidth of the proposed design covers 1.35 to 1.79 GHz (27.5%). The antenna has a satisfying characteristic of right-hand circular polarization, and the simulated axial ratio bandwidth can cover 1.4-1.58 GHz (12.1%). The radiation gain of the antenna are over 8 dBi at working band. The proposed antenna demonstrates the potentials in satellite navigation system.