جستجوی مقالات مرتبط با کلیدواژه « wideband (UWB) » در نشریات گروه « برق »

A compact and sharp-rejection ultra-wideband (UWB) microstrip bandpass filter (BPF) is presented. The proposed filter is constructed with multiple-mode resonator (MMR) and split ring resonator (SRR). Moreover, proposed structure consists of two doublets parallel cou-pling gaps at each side of a microstrip ring. In comparison with some other filters, this struc-ture shows a significantly wider passband due to the introduction of a cross-coupling be-tween the feed lines (input and output) which generate four pairs of attenuation zeros in the passband. In order to control the transmission zeros in the pass band and adjust the transmis-sion zeros near the lower edges of the filter, a Short Stub, Loaded on microstrip Rectangular Ring Has Been Used. Also, In order to sharpen the upper edge of the filter, we used SRRs in both side of the doublets parallel coupling gaps that leads to the addition of one extra trans-mission poles at the upper edge of the filter. Consequently, a compact four-zero and one pole ultra-wide bandpass filter is designed which exhibits extremely sharp rejection skirts around the target passband. The proposed filter has a passband covers 2.8 to 10 GHz and its meas-ured 3 dB fractional bandwidth is about 112.5%. Furthermore, rejection level better than 20 dB in upper stopband is extended to around 18 GHz. To our knowledge, the size of proposed ultra-wideband filter is more compact in comparison with known similar filters.

In this paper، a novel microstrip-line ultra-wideband (UWB) bandpass filter (BPF) based on multiple-mode resonator (MMR) is designed، analyzed and simulated. The structure of the proposed MMR constructed by a modified triple-mode stepped-impedance resonator (MSIR) loaded with a folded step-impedance stub (FSIS). This stub-loaded resonator could generate two more resonate modes and two transmission zeros (TZs) simultaneously. Proposed MMR’s dimensions properly tuned so that first five resonate modes of the proposed MMR roughly allocated in the desirable bandpass، i. e. 3. 1-10. 6GHz، as well as two TZs at the edge of the passband، leading to sharp roll-off. Finally، with using aperture-backed interdigital-coupled lines for feeding، an UWB BPF with compact size، high selectivity، good performance in-band، and wide stopbands is obtained. Simulation results are in excellent agreement with UWB BPF ideal case.