A circularly polarized array antenna with inclined patches using both-sided MIC technology

Abstract

A 2 × 2 circularly polarized array antenna for X-band applications is proposed in this letter. A new technique is employed to attain circular polarization by means of linear polarization patches. Two orthogonal modes with quadrature phase shift is achieved by making two patches quarter wavelength ahead and orthogonal with respect to other two patches. The feed network of the array is designed using both-sided MIC technology to overcome the impedance matching problem of conventional feed networks. A 3-dB axial ratio bandwidth of 1.41% is obtained and antenna gain is around 6.36 dBic.