Lowpass filter design technique for hybrid and monolithic implementation

This works deals with powerful approach treating the design of radiofrequency and microwave lowpass filters. A very compact topology is proposed by folding a conventional stepped impedance configuration whereas introducing an end gap coupling improving thus the filter selectivity. The lowpass filter is designed at 1 GHz cutoff frequency and implemented on both microstrip and 0.18-μm CMOS technology. The obtained result shows very competitive performances i.e. flat passband, sharp selectivity, and wide stopband.