Design of Bandpass Filter Based on Dual-Behavior Substrate Integrated Coaxial Line Resonators

A new coaxial line filter based on dual-behavior substrate integrated coaxial line(SICL) resonators has been proposed in this work. It is realized by arranging three dual-behavior resonators with an in-line topology. To validate the proposed filter, the muti-layer substrate are used to create the coaxial line platform. Then, the proposed coaxial line filter is performed by full-wave simulation, the simulated results show a excellent response. Outstanding rejection level which is better than 20 dB out of the passband is achieved and a bandwidth of more than 300 MHz. The results show that the coaxial line filter has high-quality factor, low loss, low radiation, excellent in-band filter responses and great out of passband rejection level.