Band-pass filter based on complementary split ring resonator

Abstract

This letter presents a new circuit of the band-pass filter designed by using microstrip technology. Based on complementary split ring resonator and various series of optimization technic and a specific design method, a miniature band-pass filter with excellent electrical performances is achieved. First of all, the metamaterial unit cell is studied to obtain a desired resonant frequency and it is implemented in the ground plan in order to increase the characteristics of the bandpass behavior and decrease its operating frequencies. This proposed circuit is designed on an FR-4 substrate having a relative permittivity of 4.4 tangential losses of 0.025 and thickness of 1.6 mm. This filter is developed by using CST Microwave. The obtained features allow this filter to be used in diverse wireless applications such as IMT-E and WiMax.

Design of compact microstrip bandpass filter using square DMS slots for Wi-Fi and bluetooth applications

“…The real challenge that the researchers now face is thus obtaining bandpass filters that are characterized by their excellent matching level, low insertion loss, small size, and ease of fabrication. For this, several research works have proposed techniques to reduce filter size while keeping good performances, such as open-loop ring resonators [3][4][5][6], parallel-coupled lines [7][8][9][10][11], stepped-impedance resonator (SIR) [12,13] and defected ground structure (DGS) [14][15][16][17].…”