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A method to determine the least filter order and the optimum locations of transmission zeros (TZs) of general Chebsyshev filters is presented using genetic algorithm (GA). This method is based on constructing an objective error function according to given filter magnitude specifications, and then the filter order and transmission zeros (TZs) can be obtained by minimizing the proposed error function...
A microwave bandpass MEMS filter on silicon substrate was designed and simulated in this letter. Induced coupling plasma (ICP) deep etching technology is done to get vertical via holes on the high resistivity silicon substrate. A stepped impedance resonator (SIR) structure was selected in design. The simulated and optimized results show excellent performances such as small size, low return loss, and...
This letter proposes a novel ultra-wideband (UWB) bandpass filter (BPF) using a ring resonator with improved in band and out-of-band performances. A ring resonator is structured to equally allocate its first three resonant frequencies in the 3.47–10.47-GHz UWB band. Two capacitive-ended interdigital coupled lines are then made up to assign their transmission zero towards the fourth-order resonant...
A novel compact microstrip line ultra-wideband (UWB) bandpass filter (BPF) using the proposed stub-loaded multiple-mode resonator (MMR) is presented. This MMR is formed by loading three hourglass stubs in shunt to a high impedance microstrip line in center and two symmetrical locations, respectively. By properly adjusting the dimensions of the stubs, the first four resonant modes of this MMR can be...
A novel ultra-wideband (UWB) bandpass filter (BPF) with dual notched bands using the hybrid microstrip and coplanar waveguide (CPW) structure is proposed, to prevent interference problems between the UWB radio system and existing radio systems. A multiple-mode resonator on a CPW is formed to allocate its first three resonant modes around the lower-end, centre and upper-end of the 3.1 to 10.6 GHz UWB...
On the basis of coupledline sections and impedance steps as inverter circuits, novel wideband and compact filters are presents. The compact broadband microstrip filter using a folded multiple-mode resonator contains only one resonator, which operates as not only a resonant element, but also an open stub. In addition, the filter owns a compact size, a broad passband, sharp skirts and two transmission...
A kind of novel compact wideband bandpass filter (BPF) is investigated in this paper. It is composed of four open-circuited stubs, in which two of them are folded to minimize the whole size of the filter. The new filter has been simulated and the characteristics are analyzed. The calculated results show that the BPF has a wide 3 dB fractional bandwidth which is more than 60% at the center frequency...
In this letter, a novel circular open-loop resonator is presented. The field patterns of this type of dual-mode resonator are investigated using full-wave electromagnetic simulations. The applications of the dual-mode resonator as bandpass filters are proposed. A coupling and routing scheme is presented to model the operations of these filters. Advantages of using this type of filter are not only...
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