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This paper presents a novel circular microstrip-fed antenna design targeting the UWB applications. The proposed antenna yields an impedance bandwidth of 3.1-10.6 GHz with VSWR <; 2. More importantly, time domain and frequency domain measurements on the antenna have been used to estimate short-range UWB signal transmission, propagation, and reception, and reveal some properties of this class of...
A novel tunable ferrite-wire composite chessboard structure LHM has been studied. Numerical simulation results about the transmission characteristics of the structure clearly indicate double negative property. The wider broadband property of this chessboard structure LHM compared with multi-layer structure is explored. All simulation results prove that this structure possesses three advantages: (1)...
Finite element method is introduced to analyze the transmission characteristics of depressed trapezoidal-ridge waveguide in this paper, solves the cutoff wavelength of the dominant mode, bandwidth and field patterns of the typical model size, discussions the influence of the trapezoidal-ridge size on the transmission characteristics. Some numerical results and figures are presented.
One of the key limitations on using CUT (capacitive ultrasonic transducers) and cMUTs (capacitive micromachined ultrasonic transducers) in air is their relatively narrow bandwidth which although superior to that of current piezoceramic devices could be improved. Most air coupled capacitive devices could benefit hugely through the use of selective networks for bandwidth expansion, resonance reinforcing,...
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