Wave Propagation in Lossy and Superconducting Circular Waveguides

被引:0
|
作者
Yeap, Kim Ho [1 ]
Tham, Choy Yoong [2 ]
Yeong, Kee Choon [3 ]
Woo, Haw Jiunn [4 ]
机构
[1] Jln Univ, Tunku Abdul Rahman Univ, Fac Engn & Green Technol, Kampar 31900, Perak, Malaysia
[2] Wawasan Open Univ, Sch Sci & Technol, Jln Sultan Ahmad Shah 10050, Penang, Malaysia
[3] Jln Univ, Tunku Abdul Rahman Univ, Fac Sci, Kampar 31900, Perak, Malaysia
[4] Tunku Abdul Rahman Univ, Fac Sci & Engn, Kuala Lumpur 53300, Malaysia
关键词
Circular waveguides; superconductor; propagation constant; dispersive effect; Cooper-pair; FINLINE MIXER; ATTENUATION; FREQUENCY; RECEIVERS;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present an accurate approach to compute the attenuation of waves, propagating in circular wave-guides 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 k(z) 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.
引用
收藏
页码:320 / 325
页数:6
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