A Differentially-Fed Dual-Polarized Antenna Based on Substrate Integrated Waveguide

A differentially-fed dual-polarized antenna based on substrate integrated waveguide (SIW) is proposed. The proposed antenna consists of a pair of crossed slots, two orthogonal microstrip feed lines and a SIW cavity, which is easy for fabrication. Due to the orthogonality between the two microstrip feed lines, a high isolation is obtained. The impedance bandwidth of the proposed antenna is about 24% (13.2-16.8 GHz) for differential reflection coefficient <;-10 dB with isolation >40 dB.