Control of critical coupling in a coiled coaxial cable resonator

Jie Huang; Tao Wei; Tao Wang; Jun Fan; Hai Xiao

doi:10.1063/1.4873325

Control of critical coupling in a coiled coaxial cable resonator

Rev Sci Instrum. 2014 May;85(5):054701. doi: 10.1063/1.4873325.

Authors

Jie Huang¹, Tao Wei², Tao Wang², Jun Fan², Hai Xiao¹

Affiliations

¹ Department of Electrical and Computer Engineering, Center for Optical Materials Science and Engineering Technologies, Clemson University, South Carolina 29634, USA.
² Department of Electrical and Computer Engineering, Missouri University of Science and Technology Rolla, Missouri 65409, USA.

PMID: 24880389
DOI: 10.1063/1.4873325

Abstract

This paper reports a coiled coaxial cable resonator fabricated by cutting a slot in a spring-like coiled coaxial cable to produce a periodic perturbation. Electromagnetic coupling between two neighboring slots was observed. By manipulating the number of slots, critical coupling of the coiled coaxial cable resonator can be well controlled. An ultrahigh signal-to-noise ratio (over 50 dB) at the resonant frequency band was experimentally achieved from a coiled coaxial cable resonator with 38 turns. A theoretic model is developed to understand the device physics. The proposed device can be potentially used as a high quality and flexibly designed band-stop filter or a sensor in structural health monitoring.