Abstract
AbstractA stub‐loaded stepped‐impedance resonator (SIR) filter with an ultra‐wide upper stopband is proposed. For a 20‐dB rejection level, by properly choosing the number and lengths of the stubs, the second, third, and fourth resonances of the SIR filter are pushed to left and the seventh resonance is pushed to right, and all of them show low S21 levels due to the improper external coupling values, while the fifth and sixth resonances are greatly suppressed by a transmission zero. The measured 20‐dB rejection band of a three‐stub SIR filter achieves 17.4 times the designed frequency. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2660–2662, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24740
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