Abstract
AbstractThis article presents a miniaturized dual‐mode narrow bandpass filter using an equilateral triangular patch resonator with an inverted T‐shaped slot, which exhibited a size reduction of 37% compared with a single‐mode equilateral triangular patch at the same frequency. Two‐ and four‐pole dual‐mode bandpass filters were designed and fabricated with this new resonator. Experimental results with the two‐pole filter centred at 7.76 GHz showed a fractional bandwidth of 4.5%, return loss better than 17.8 dB, and minimum insertion loss of 2.2 dB. The results of the four‐pole filter showed a fractional bandwidth of 3.5%, return loss better than 16 dB, minimum insertion loss of 2.6 dB, and a good second harmonic band rejection. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2897–2902, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22927
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