Location of Repository

Wave Propagation in Lossy and Superconducting Circular Waveguides

By K. H. Yeap, C. Y. Tham, K. C. Yeong and H. J. Woo

Abstract

We present an accurate approach to compute the attenuation of waves, propagating in circular waveguides with lossy and superconducting walls. A set of transcendental equation is developed by matching the fields at the surface of the wall with the electrical properties of the wall material. The propagation constant kz is found by numerically solving for the root of the equation. The complex conductivity of the superconductor is obtained from the Mattis-Bardeen equations. We have compared the loss of TE11 mode computed using our technique with that using the perturbation and Stratton’s methods. The results from the three methods agree very well at a reasonable range of frequencies above the cutoff. The curves, however, deviate below cutoff and at millimeter wave frequencies. We attribute the discrepancies to the dispersive effect and the presence of the longitudinal fields in a lossy waveguide. At frequencies below the gap, the superconducting waveguide exhibits lossless transmission behavior. Above the gap frequency, Cooper-pair breaking becomes dominant and the loss increases significantly

Topics: Circular waveguides, superconductor, propagation constant, dispersive effect, Cooper-pair, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Technology, T, DOAJ:Electrical and Nuclear Engineering, DOAJ:Technology and Engineering
Publisher: Spolecnost pro radioelektronicke inzenyrstvi
Year: 2010
OAI identifier: oai:doaj.org/article:8c280e40d16f4a08bb220884fbde6c31
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/1210-2512 (external link)
  • www.radioeng.cz/fulltexts/2010... (external link)
  • https://doaj.org/article/8c280... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.