Metamaterial-inspired sensor based on a complementary asymmetric double-split resonator

Abstract

Based on the Babinet Principle, a new metamaterial sensor is proposed in microwave region. The main part of the device is a microstrip coupled complementary asymmetric double-split resonator (CADSR). In this device, an extremely sharp resonance have been obtained due to the excitation of “trapped modes”. From the analysis, the effect of the degree of asymmetry on the frequency response and Q-Factor are thoroughly studied. Results show that there have an upward tendency of Q-Factor when increasing the degree of asymmetry, the distribution of the electric field and transmission response (S2i) have been also simulated in this work. Finally, the process and the performance is illustrated when CADSR is used as a sensor. We found that both dielectric constant and loss tangent of sample substance affect the resonance frequency. It is demonstrated that the reflection spectrum shift to lower frequency side when enhancing the permittivity of sample substance which is filled in groove. Furthermore, the CADSR will increase the contact area with field and sample, and the relation between resonant frequency and the sample permittivity exhibits a perfect linearity.