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A microstrip planar lowpass filter (LPF) with sharp roll-off and ultra-wide stopband up to 40 GHz is presented. The central part of the LPF consists of three basic circular sectors, two smaller quadrants and a number of high-impedance lines that are cross-coupled to form a high cut-off rate and a moderate stop band from 2.3 to 10 GHz. Then, four types of resonator cells, three of which are high-impedance...