Broad-Band Differential-Fed Patch Antenna - A Novel Feeding Scheme to Realizing Stability of Radiation Characteristics

A new bandwidth enhancement methodology for differential-fed patch antenna (DFPA) using a vertical feeding plate pair is proposed. The devised feeding approach effectually offers a very wide band impedance matching for the antenna and provides a unified gain and radiation pattern stabilization technique for performance improvement. Experimental results reveal an impedance bandwidth of more than 70% for the devised DFPA. Symmetric radiation patterns and low cross-polarization levels are realized within the band. More importantly, the antenna gain maintains high at 8.5 dBi with stable radiation patterns, hence achieving the high stability of the radiation characteristics.