A dual-band frequency scanning antenna based on spoof SPPs transmission line

In this paper, a dual-band frequency scanning antenna based on spoof SPPs transmission line was proposed. The effect of each parameter in the rectangular holes of spoof SPPs on the dispersion characteristics and the frequency band of the spoof SPPs transmission line application was analyzed. The results show that the depths of rectangular hole have a large effect on the cut-off frequency, and etching two rectangular holes of different depths in a metal strip can generate standing waves in the transmission line. Based on this structure, a dual-band frequency scanning antenna was designed by combining magnetic coupling with the principle of leakage radiation. Loading two sets of circular patches of different sizes on both sides of the spoof SPPs transmission line achieved a dual-band frequency sweep of 90° – 196 ° in the 4–9 GHz and 126°–192° in the 16–32 GHz, with sweep angles of 106° and 66°. The antenna achieved a gain of 10–12 dBi in the operating band with an average radiation efficiency about 90%. The antenna was subjected to processing and testing, and the experimental results verified the good frequency scanning characteristics. The antenna proposed has a great potential for use in planar integrated communication systems and fifth-generation wireless communication system.