Abstract
In this letter, a compact bandpass filter having quasi-elliptic response is proposed using short-circuited stub loaded λ/2 stepped impedance resonator (SCSL-SIR). Five transmission zeros generated helps in achieving high selectivity and improve out-of-band rejection characteristics of BPF. A compact bandpass filter having a size of 0.109λg×0.104λg, with a 3dB fractional bandwidth of 14% and having lower/upper stopband roll-off rates of 1.91dB/MHz/1.44dB/MHz is designed at 0.350GHz for Terrestrial Trunked Radio (TETRA) band applications.
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