Compact sharp-rejection broadband microstrip bandpass filter with wide stopband

Summary form only given, as follows. A compact sharp-rejection broadband microstrip bandpass filter with a wide stopband is presented. The major block is a half-wavelength resonator loaded by a meandering coupled line. By adjusting the dimensions of the meandering coupled line and using multi-path cancellation techniques, one can control multiple transmission zeros to obtain a wide stopband. From 2.3 to 4.1 GHz, the measured return loss is greater than 15 dB, and the measured insertion loss is less than 0.8 dB.