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This paper proposes a new broadband microstrip bandpass filter based on a step-impedance resonator (SIR) and embedded slot structure for a notch-band and improved upper stopband performances. A comprehensive treatment of a slotted resonator with both ends of interdigital coupled lines and an embedded slot feed is described. The proposed filter has a notch-band and a wider upper stopband, resulting from the slotted feed line and resonator characteristics. The simulated and experimental results show a narrow notch-band and superior stopband performances of better than 10 dB for a frequency range up to 25 GHz.
Microwave Conference, 2009. APMC 2009. Asia Pacific
Date of Conference: 7-10 Dec. 2009