Low-loss bandpass filter using higher mode strip line for millimetre-wave integrated circuits

A technique to construct - a low-loss printed bandpass filter was demonstrated by using a higher mode strip line at 30 GHz. A three-pole, 0.1 dB Chebyshev ripple bandpass filter with a 2% relative bandwidth was designed and fabricated. The insertion loss was found to be 0.7 dB.