Dielectric Sensors Based on Electromagnetic Energy Tunneling

Sensors

Omar Siddiqui¹  Mani Kashanianfard³  Omar Ramahi² 

[1] College of Engineering, Taibah University, University Road, Madinah, Saudi Arabia; E-Mail:;Department of Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA; E-Mail:

关键词: energy tunneling;    dielectric sensors;    metamaterials;    metallic wire medium;    waveguides;   

DOI  :  10.3390/s150407844

来源: mdpi

【 摘 要 】

We show that metallic wires embedded in narrow waveguide bends and channels demonstrate resonance behavior at specific frequencies. The electromagnetic energy at these resonances tunnels through the narrow waveguide channels with almost no propagation losses. Under the tunneling behavior, high-intensity electromagnetic fields are produced in the vicinity of the metallic wires. These intense field resonances can be exploited to build highly sensitive dielectric sensors. The sensor operation is explained with the help of full-wave simulations. A practical setup consisting of a 3D waveguide bend is presented to experimentally observe the tunneling phenomenon. The tunneling frequency is predicted by determining the input impedance minima through a variational formula based on the Green function of a probe-excited parallel plate waveguide.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.