Aspects of the Scattering and Impedance Properties of Chaotic Microwave Cavities |
| S. Hemmadya,b,c,d, X. Zhenga,d, T.M. Antonsen Jr.a,b,d, E. Otta,b,d and S.M. Anlagea,b,c
aDepartment of Physics, University of Maryland, College Park, MD 20742-4111 USA bDepartment of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742-4111 USA cCenter for Superconductivity Research, University of Maryland, College Park, MD 20742-4111 USA dInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-4111 USA |
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| Received: 19 05 2005; |
| We consider the statistics of the impedance Z of a chaotic microwave cavity coupled to a single port. We remove the non-universal effects of the coupling from the experimental Z data using the radiation impedance obtained directly from the experiments. We thus obtain the normalized impedance whose probability density function is predicted to be universal in that it depends only on the loss (quality factor) of the cavity. We find that impedance fluctuations decrease with increasing loss. The results apply to scattering measurements on any wave chaotic system. |
| DOI: 10.12693/APhysPolA.109.65 PACS numbers:05.45.Mt, 03.65.Nk, 11.55.-m, 03.50.De, 84.40.-x, 84.40.Az |