Compact UWB LPF based on uni-planar metamaterial complementary split ring resonator

This paper presents a compact ultra-wide low pass filter based on a new configuration of metamaterial complementary split ring resonator. The resonator is etched in the top plane of the microstrip as new contribution for using it in filter applications. The filter has insertion loss close to 0 dB over the frequency band DC up to 10.8 GHz. Also, the filter has the advantage of small size (18 mm × 7 mm) whose length is only about 32% of the guided wave length at mid frequency. Different order types of this filter are discussed in the paper. The filter design is explained and its performance is validated using full wave simulation and experimental measurements. Very good agreement between the two results is achieved which confirm the theoretical design.