High-Scanning-Rate Terahertz Dual-Beam Leaky-Wave Antenna Based on Spoof Surface Plasmon Polaritons
In this paper,a compact high-gain,high-scanning-rate and dual-beam leaky-wave antenna(LWA)opera-ting in the terahertz frequency band is proposed.The antenna consists of two half-mode substrate integrated waveguide(HMSIW)LWAs with the same modulation period and a power-recycling semicircular structure.Firstly,a high-scanning-rate LWA is realized by means of periodically etched slots on the top surface of HMSIW,which introduces the slow wave effect of spoof surface plasmonic polaritons(SSPP),combined with a sinusoidal modulation which leads to the LWA radiation in the narrow frequency band in proximity to the cutoff frequency of SSPPs.Then,two symmetrical scanning beams are produced by two parallel HMSIW LWAs connected at one end through a semicircular structure,which further enhances the beam scanning rate.It is found that in the operating band of 1.25～1.31 THz(i.e.,a relative bandwidth of 4.6%),the proposed antenna achieves a dual-beam scanning angle of 80°,a beam scanning rate of 17.4,and a maxi-mum gain of 14.4 dBi.In addition,the antenna structure evolves from one-dimension to two-dimensions,exhibiting a small overall size.It can be applied in terahertz wireless communication and radar detection systems.
万方数据
维普
