Design and realization of different microstrip low pass filter topologies by aid of AWR microwave office ifilter wizard

In this work; 7th order Butterworth, Chebyshev, Cauer (elliptic), Bessel, Legendre and Gaussian low pass filters designed, simulated, realized and measured with aid of iFilter tool of AWR Microwave Office. First, all the filters were designed with lumped L-C elements. Secondly, all lumped components were converted to the microstrip lines as series lines and shunt stubs. All microstrip line widths and lengths were optimized with AWR simulation tool. Comparisons in terms od insertion loss between simulation results of designed lumped filters and measurement results of realized distributed (microstrip) filters show that, distributed filters can be easily optimized by changing widths and lengths of lines without any performance degradation.