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In this paper, the design of a bandpass filter (BPF) using open-loop resonator (OLR) with interdigital capacitor added in one set of a half-wavelength resonator is presented. The open-loop resonator filter is constructed by placing a half-wavelength microstrip lines to achieve enhanced filter performance. The interdigital capacitors are employed to control the center frequency easily. An open-loop resonator is derived from one and half-wavelength resonator, which is used to enhance bandwidth. It also introduces transmission zeros in the passband. The three coupling methods, such as electric, magnetic, and mixed-couplings, are used to design the filter with desired characteristics. The filter is operating at 1.93 GHz and 2.41 GHz with 3 dB bandwidth of 8.8% and 9.5%, insertion loss of 0.6 dB and 0.5dB, return loss of passbands >15 dB, and two transmission zeros at 1.71 GHz and 2.88 GHz with better sharpness. The simulation performance evaluations of the filter are carried out using Computer Simulation Technology (CST). The proposed filter makes it very desirable for WiMAX and high-performance RF microelectromechanical system (RF-MEMS) tunable filter and PCS applications.

Bandpass Filter with Interdigital Capacitor in Open Loop Resonator for Wimax, RF-MEMS, and PCS Applications