A hybrid substrate integrated waveguide and spoof surface plasmon polaritonleaky-waveantenna with open stopband suppressed

Abstract

In this paper, an asymmetric sinusoidal modulated substrate integrated waveguide-spoof surface plasmon polariton (SIW-SSPP) leaky-wave antenna with open stopband suppressed is proposed. The SSPP transmission line can covert the guided waves to the leaky-wave radiations with frequency-scanning properties due to the sinusoidal modulation. Using asymmetric model is an effective method to restrain the open stopband. The asymmetric radiating element with pi/2 phase difference between the upper and lower sides of the top surface is introduced in the antenna to realize zero-crossing beam scanning and unidirectional radiation characteristic. In the operating band of 12.6 to 13.7 GHz, the measured scanning angle of the fabricated antenna is from -14 degrees to +34 degrees. The gain is above 10.1 dBi and the radiation efficiency is basically above 50% over the operating band. Although the way of eliminate the open stopband has been proposed, this is the first time it is used in SIW-SSPP antenna design. It has potential applications in radar and wireless communication systems for simple structure, low-profile, zero-crossing beam scanning, and unidirectional radiation performance.