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An ultra-wideband bandpass filter (UWB) consisting of stepped-impedance resonators cascaded by parallel-coupled two-line and three-line structures is designed to satisfy Federal Communications Commission (FCC)'s spectrum mask. Firstly, a simpler equivalent circuit for the parallel-coupled three lines is derived based on the transmission line theory. Then, after the derivation of the Chebyshev-type...
In this paper, a novel ultra-wideband (UWB) bandpass filter having a midband frequency of 4.1 GHz and a fractional bandwidth of 34.1% is designed with a combined use of a microstrip stub-loaded dual-mode ring resonator and parallel-coupled step-impedance two-mode resonators. Advantages of both the stub-loaded ring resonator and the step-impedance two-mode resonator are exploited, and the UWB filter...
A novel compact ultra-wideband (UWB) bandpass filter is proposed to meet federal communications commission (FCC)'s spectrum mask. Shunt short-circuited stubs and the parallel coupled stepped-impedance resonators (SIRs) are used to achieve a fraction passband from 3.1 GHz to 10.6 GHz. The equivalent circuit of the newly proposed filter is established, while the corresponding chebyshev-type transfer...
In this paper, a novel millimeter-wave ultra-wideband (UWB) bandpass filter having a midband frequency of 26.5 GHz and a 3 dB bandwidth of 3.4 GHz is developed by using microstrip dual-mode rectangular ring resonators. Resonant properties of the microstrip dual-mode rectangular ring resonator are analyzed by using an electromagnetic simulator, and stepped- impedance parallel-coupled feed lines are...
In this paper, a millimeter-wave ultra-wideband (UWB) bandpass filter is developed by cascading two microstrip dual-mode ring resonators loaded with lambda0/4 and 3lambda0/4 open tuning stubs, respectively. The ring resonators are analyzed by using the even-and odd-mode method, and closed-form formulas are derived to facilitate the design of transmission zeros of these resonators. The filter has a...
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