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This paper introduces a new class of dual-band microwave filter using hybrid Chebyshev polynomial functions. It may be shown that the Chebyshev function of its first and second kind can be used to form a hybrid filtering function in which a novel transfer function of a dual-band low pass prototype (DBLPP) is defined. In contrast to recent filter topologies and design techniques with specific transformations,...
The design of compact and very selective dual band dual-mode filter with improved isolation is introduced in this paper. The two passbands are achieved by connecting two stepped-impedance dual-mode resonators in parallel. Two transmission zeros are obtained on both sides of each passband with the use of the source-load coupling. Theoretical analysis together with experimental prototype is presented.
A novel dual-mode coaxial resonator filter based on the stepped-impedance line is introduced in this paper. The theory of dual-mode resonator and its feasibility of higher order realization based on parallel connected network are shown. The cavity prototype has been fabricated to prove the feasibility of this approach. The measured results show the excellent agreement with the theories. In contrast...
Electronically switchable microwave filters are significant in increasing the capability of wireless communication and cognitive radios which is making them highly considerable for research and development. This paper describes and delves into the design of novel microwave switchable band-stop to bandpass filters. The filter is composed of stepped impedance resonators and can be switched to exhibit...
In this paper a highly selective ultra-wide band (UWB) bandpass filter is designed using interdigital parallel coupled lines (IDPCL) and multiple resonance resonator (MRR). Interdigital capacitor (IDC) is used to achieve strong coupling between short circuit stubs. Mixed coupling produced by IDC and coupled short circuit stubs introduce a finite transmission zero. This transmission zero will increase...
In this paper a high selective compact ultrawide band (UWB) bandpass filter has been designed using a novel multiple resonances resonator (MRR). Equivalent circuit has been extracted for the proposed single order MRR where the filtering function was derived, showing the feasibility of a maximum of six transmission poles in the passband. Finite frequency transmission zero was introduced by having a...
A complete synthesis and design of fourth order UWB BPF has been presented in this paper. Based on MMR, equivalent circuit is used to derive transfer function which is then used to extract the filtering function. For optimal solution, mathematical formulation is used to calculate characteristic impedance of filter in order to have chebyshev type frequency response. To validate the synthesis a prototype...
A quasi-elliptic triple-mode resonator filter is proposed in this paper. The filter is realized by having a capacitive coupling between the input and the output of a proposed triple mode resonator with one transmission zero at the high side of the passband. With the mentioned coupling, additional two transmission zeros are obtained at both sides of the passband which yields a quasi-elliptic response...
A novel microwave planar triple-mode resonator filter structure to achieve triple-mode rather than dual-mode response has been developed for miniaturization of high selectivity narrow-band microwave bandpass filter. The filter is miniaturized by incorporating a novel stepped impedance triple-mode into resonator. The filter has a passband bandwidth of 6% at 1 GHz. The measured result shows less than...
A novel electronically reconfigurable microwave bandpass filter based on a switched delay-line approach is presented. In contrast to conventional tunable filters, the approach enables the lossy and nonlinear switching elements to be used as part of the coupling elements rather than within the resonators. Therefore, the filter distinguishes itself through its ability to provide a wide tuning bandwidth...
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