Simulation and Analysis of LPFSA Loaded with Split-Ring Resonators

A log-periodic folded slot antenna (LPFSA) loaded with the complementary split-ring resonators (CSRRs) was simulated for the application of ultra-wide band (UWB) electronic system. The designed LPFSA radiator was etched on a thick microwave substrate and the working frequency range is from 1.5GHz to 12GHz. In view of the restriction of the installation size of the antenna, the transverse dimension of the antenna was compressed, which leaded to the performance degradation at low frequency. The co-planar waveguide was used to excite the radiator. The CSRRs were loaded below the slot dipole corresponding to the low frequency, which were used to adjust the impedance performance. The antenna was designed and optimized by full-wave electromagnetic simulation software. The simulated results show that the average voltage standing wave ratio (VSWR) is about 3.8 within the frequency range of 1.5GHz to 12GHz. What's more, the effective pattern was achieved and the gain is about 2.5dB at 1.5GHz. The results show the feasibility of the antenna design proposed in this paper.