scholarly journals Wide frequency range lumped element equivalent circuit for HF planar transformer

2008 ◽  
Author(s):  
A. Besri ◽  
X. Margueron ◽  
J-P. Keradec ◽  
B. Delinchant
Keyword(s):  
Equivalent Circuit ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Lumped Element

scholarly journals Compact left-handed dual-band filters based on shundted stub resonators

2019 ◽  
Vol 32 (4) ◽  
pp. 571-579
Author(s):  
Vasa Radonic ◽  
Vesna Crnojevic-Bengin
Keyword(s):  
Equivalent Circuit ◽  
Superposition Principle ◽  
Equivalent Circuit Model ◽  
Wide Frequency Range ◽  
Dual Band ◽  
Geometrical Parameters ◽  
Frequency Range ◽  
Frequency Bands ◽  
Left Handed ◽  
Spurious Response

In this paper, super-compact microstrip dual-band resonator is presented, designed using the superposition of two simple left-handed (LH) resonators with single shunt stub. The proposed resonator exhibits spurious response in wide frequency range and therefore allows construction of dual-band filters using the superposition principle. The equivalent circuit model of the proposed resonator is crated and the influence of different geometrical parameters to the performances of the resonator are analyzed in details. As an examples, two dual-band filters that operate simultaneously at the WiMAX frequency bands are designed.

Reply by authors to discussion by Ellis Strick

Geophysics ◽  
1973 ◽  
Vol 38 (2) ◽  
pp. 425-429 ◽  
Author(s):  
J. E. White ◽  
D. J. Walsh
Keyword(s):  
Wave Propagation ◽  
Element Model ◽  
Seismic Wave Propagation ◽  
Wide Frequency Range ◽  
Velocity Variation ◽  
Frequency Range ◽  
Low Frequencies ◽  
Lumped Element ◽  
Counter Example ◽  
Lumped Element Model

A short quotation from the paper under discussion may help provide the background for this rebuttal: “The intended message of this paper is quite simple: Attenuation very nearly proportional to frequency over a wide frequency range does not demand substantial velocity variation within this frequency band and does not require any unusual velocity variation at low frequencies. The approach is to present one counter‐example to the published allegations that such velocity variation is essential, in view of casuality and mathematical considerations.” The counter‐example, a lumped‐element model, is full and complete and the reader is invited to refer to the paper. The authors did not propose this model as the ultimate description of seismic wave propagation in rocks. In fact, the paper contained this encouragement for further research.

scholarly journals A computationally efficient hybrid 2D–3D subwoofer model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmad H. Bokhari ◽  
Martin Berggren ◽  
Daniel Noreland ◽  
Eddie Wadbro
Keyword(s):  
Hybrid Model ◽  
3D Model ◽  
Element Model ◽  
Acoustic Properties ◽  
Computational Time ◽  
Average Response ◽  
Frequency Range ◽  
Computationally Efficient ◽  
Lumped Element ◽  
Lumped Element Model

AbstractA subwoofer generates the lowest frequency range in loudspeaker systems. Subwoofers are used in audio systems for live concerts, movie theatres, home theatres, gaming consoles, cars, etc. During the last decades, numerical simulations have emerged as a cost- and time-efficient complement to traditional experiments in the design process of different products. The aim of this study is to reduce the computational time of simulating the average response for a given subwoofer design. To this end, we propose a hybrid 2D–3D model that reduces the computational time significantly compared to a full 3D model. The hybrid model describes the interaction between different subwoofer components as interacting modules whose acoustic properties can partly be pre-computed. This allows us to efficiently compute the performance of different subwoofer design layouts. The results of the hybrid model are validated against both a lumped element model and a full 3D model over a frequency band of interest. The hybrid model is found to be both accurate and computationally efficient.

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