Combination of the Endfire Antenna and Backfire Antenna for Gain Enhancement

This paper presents a new method to designing high-gain antennas by adding dielectric substrate above and below the traditional crossover stripline endfire antenna with phase reversal, resulting in a high-gain endfire antenna and a backfire antenna. When the endfire antenna and backfire antenna are placed in a line and excited simultaneously, gain superposition in the same direction can be achieved, resulting in a high gain increase in the 9.85-10.30 GHz frequency band. The combination of two antennas achieves the highest gain of 17.63 dBi at 10.25 GHz, which is 3 dB higher than the gain of a single antenna. Therefore, the combination of endfire and backfire antennas is an effective strategy for achieving high gain improvement.