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Compact size microstrip low-pass filters with sharp cutoff characteristics, narrow passband, low insertion loss, high attenuation in stopband and low cost are highly required in modern wireless communication systems. They are used to suppress the unwanted harmonics and noise caused by Radio Frequency (RF) front ends. In this paper a new design for compact microstrip LPF is proposed. It is based on utilization of Stepped Impedance Resonators (SIR), Defected Microstrip Structure (DMS), Dumbbell-shaped Defected Ground Structure (DB-DGS), and surface mount capacitor. The filter is realized on an F4B-2 substrate with εr = 2.65, thickness h = 0.5 mm and loss tangentδ = 0.0013. The design is carried out using CST-Microwave Studio software. The equivalent circuit of the filter is analyzed and presented using ADS2006A software. The filter exhibits sharp cutoff frequency fc = 1.7654 GHz, wide stopband from 1.7654 GHz to 7 GHz with |S21| less than −10 dB, insertion loss less than 0.15 dB in passband and reduced size compared to the traditional LPF.

IMPLEMENTATION OF COMPACT LPF UTILIZING DEFECTED STRUCTURES AND SURFACE MOUNT CAPACITOR FOR LOW INSERTION LOSS AND ELLIPTIC CHARACTERISTICS