科研之友
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摘要
A compact microstrip lowpass filter with harmonic suppression exhibits ultra-wideband rejection. It is based on triangular patch resonators and a butterfly patch resonator with two 120 degree radial "wing" patches. A filter of this design with a 3 dB cutoff frequency at 1.78 GHz achieves a harmonic suppression bandwidth of 158 percent, enabling it to suppress the twelfth harmonic response. Its small size of 14.5 mm x 18 mm corresponds to 0.133 lambda g x 0.165 lambda g, where lambda g is the guided wavelength at 1.78 GHz.
