A novel linearly polarized (LP) wideband hybrid antenna using semi-elliptical substrate integrated waveguide (SIW) cavity and a patch radiator is proposed. The cavity is tuned at its fundamental resonant frequency, which excites the patch radiator in such a way that the resonant frequencies of the two resonators are merged to provide broadband operation. The hybrid antenna is simulated using High Frequency Simulation Structure (HFSS) and the results including reflection coefficient, impedance bandwidth, co- and cross-polarization patterns, Half Power Beam width (HPBW), and the variation of gain versus frequency is reported. It is shown that the proposed hybrid antenna provides 10.9% fractional impedance bandwidth (FBW) with gain of 6.55 dB.

Keywords