A New Microstrip Bandpass Filter Design

Abstract — A narrowband, compact, and flexible fabricated microstrip bandpass filter design is presented in this paper as a aspirant for use in modern wireless systems. The proposed filter design is based on the use of dual-mode (two pole) microstrip patch resonator with uniform geometrical slot. This filter has the advantages of owning much narrower and sharper performance responses as compared to single mode resonator and other conventional square patch filters. The performance of filter structures, based on dual-mode resonators, has been evaluated using Sonnet electromagnetic simulator. This filter has been designed at resonant frequency 4.16 GHz using a substrate with a dielectric constant of 10.8 and thickness of 1.27mm.Performance simulation results show that filter structure offers very good frequency responses in addition to narrow bands gained , compactness properties and 2PndP harmonic suppression in out of band region