Input impedance characteristics of double barrier structures
DOI:
https://doi.org/10.20535/RADAP.2014.58.112-120Keywords:
resonant passing, resonant tunneling, double barrier structure, delta-barrierAbstract
Introduction. Double barrier structures (DBSs) are widely used in different technical areas. In the paper the features of input impedance characteristics of DBS are investigated and conditions of resonant passing, including resonant tunneling, of waves are set.Delta-model of double barrier structure. A model of DBS in the form of two impedance delta-barriers in quantum-mechanical, electromagnetic and acoustic media is considered. Analytical expressions for the input impedance characteristics are received. Impedance conditions of resonance passing of waves through DBS are obtained. New condition of resonance passing through DBS is set.
Electromagnetic and acoustic double barrier structures. Dependences of input impedance active and reactive components and transfer coefficient of DBS are given. Accordance of DBS characteristics with finite size barriers and its delta-model is analysed. The analogy of DBS and parallel oscillatory circuit is set.
Quantum-mechanical double barrier structure. Dependences of input impedance and transfer coefficient of quantum-mechanical DBS are given. Character of active component dependence is similar to transfer coefficient characteristic. Resonance transfer characteristics have very high quality factor.
Conclusions. Input impedance characteristics of DBS allow to analyse wave properties of such structures, set the conditions of resonant passing, including resonant tunneling, waves. By analysing the input impedance characteristics conditions of resonant passing for DBS, located between media with different wave impedances, were determined.
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