A microwave detector based on spoof surface plasmon polaritons structure

In this paper, a Schottky diode detector based on spoof surface plasmon polariton (SPP) structure is reported. The detector consists of an input matching network, a Schottky diode, and an output filtering network. The proposed detector is designed using a step impedance section and λ/4 radial stub integrated in the circuit. Compared with the conventional microwave detector, experimental results show that the proposed detector achieves 31% improvement of detection sensitivity with the high input radio frequency (RF) power and 95% improvement of the detection sensitivity with the low input RF power by the SPPs. The proposed detector is attractive for use in aircraft, vehicles, and wireless communication due to its miniaturization, low-cost, and easy fabrication with planar circuits.