The National Natural Science Foundation of China(No.60621002,60702027,60921063);the National Basic Research Program of China(973Program)(No.2010CB327400);the National High Technology Research and Development Program of China(863Program)(No.2008ZX03005-001,2008AA01Z223,2009AA011503)
A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators(SIRs)loaded with two shunt open stubs is presented.By tuning the physical lengths of open...