In this paper, a novel compact lowpass filter using lattice-shaped resonator is presented with wide rejection band. The proposed lowpass filter is designed to fabricate on a Duroid 5880 microstrip layout. The aim of design was to obtain a lowpass filter with -3 dB cut off frequency of 4.16 GHz. Simulated results showed a low insertion loss about 0.1 dB in 94% of the passband region. The size of the designed filter is only 9.5 × 9.5mm2.
