Triangular microstrip loop resonator bandpass filter using Koch curve approach

Abstract

Microstrip bandpass filters are used to select or confine the RF/microwave signals within assigned spectral limits so as to share the limited electromagnetic spectrum. Use of dual mode resonator allows the realization of a compact high quality microwave bandpass filter (BPF). The filters designed with fractal geometry are having reduced return loss and good passband performance. This paper presents a triangular microstrip loop resonator BPF constructed using Fractal Koch curve approach. The simulation results show that the proposed fractal triangular microstrip loop resonator can achieve lower resonant frequencies compared to conventional triangular loop resonator filter hence size reduction is possible. Also a better performance is obtained in case of fractal triangular loop resonator bandpass filter.