Quarter wavelength resonatorSound absorptionOrigamiSpiralPorous materialSound absorption at low to moderate frequencies using quarter-wavelength resonators requires significant resonator's length (for instance 28 cm for 300 Hz), a condition very often uncompatible with a practical use of this kind of ...
In this paper, the design and experiment of a novel substrate integrated folded waveguide (SIFW) partial H-plane bandpass filter, consisting of quarter wavelength resonators, is presented. In the proposed filter, two adjacent quarter wavelength resonators are coupled by connecting an admittance ...
A novel dual passband filter using hybrid microstrip split ring resonators and coplanar wavelength (CPW) quarter wavelength resonators is presented. An equivalent RLC circuit model is presented, and its corresponding parameters are also extracted from the theoretical analysis. The proposed dual passband ...
Compact wideband bandpass filters are proposed based on the dual-metal-plane structure consisting of both microstrip and coplanar-waveguide (CPW) quarter-wavelength resonators. By combining the advantages of dual-plane microstrip/CPW structure and stepped-impedance resonators, strong couplings between resona...
embedded resonators, and the side-coupled open-loop resonators are uti- lized to construct the third one. Seven transmission zeros are generated due to the 0 feed structure and the canceling effects between electric coupling and magnetic coupling, which improve the skirt selectivity and band-to-ban...
7.42, are known as quarter-wave resonators because a wave reflected from the bottom returns a half wavelength or 180° out of phase with the wave reflected from the surface. When the length of the tube is an odd-integer multiple of a quarter wavelength it is out of phase with the ...
zeros originating from source-load and multi-resonators coupling was realized. Note that most microstrip combline or modified combline filters only have transmission zeros in the lower stopband or upper stopband, and this leads to an asymmetrical transmission response and poor rejection in the...
The interaction structure 15 which can be any slow or fast wave structure is shown for illustrative purposes as a coupled cavity structure made up of cavity resonators 34 formed by partially hollowed out discs 35 located within the envelope and centrally apertured at 36 for passage of the beam ...
Presents a rigorous method for analysis of coupled dielectric quarter wavelength combline resonators. Investigation of the resonant frequencies and coupling coefficients of the resonators coupled by different coupling structures; Description of a filter design technique based on the result of numerical ...
This article presents a compact hairpin bandpass filter using multilayer stripline folded quarter-wavelength resonators in a low-temperature cofired ceramic substrate.Using the new structure designs accomplish the vertical coupling in multilayer system, the size of the proposed filter can be reduced about...