Abstract
A novel microstrip lowpass filter (LPF) with good specifications such as wide stopband and sharp roll-off is reported. The filter structure consists of split ring resonator loaded by folded polygene patches. The proposed filter with −3 dB cut-off frequency at 1.57 GHz has been designed, fabricated and measured. The LPF has a wide stopband from 1.67 to 14 GHz with a rejection level greater than −20 dB, sharp roll-off rate equal to 170 dB/GHz and low insertion loss lower than 0.13 dB in 94% of the passband. Finally, a high figure of merit of 51,178 is obtained.
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