Resonance transmission of electromagnetic wave through a thin dielectric rod

Squeezing and transmitting electromagnetic energy through structures with transverse dimensions very much smaller than the operating wavelength assumes an importance in various microwave and optical fields. We present a means using resonance transmission whereby electromagnetic waves inside rectangular waveguides are significantly squeezed and efficiently transmitted in a thin dielectric rod. At resonance frequencies, electromagnetic waves form an integer number of resonance magnetic dipoles along the rod. With these dipoles alternately arranged, the phase shift between the two ends of the rod is 0°or 180°on whether their number is even or odd. The experimental results are in agreement with the theory and simulated results. This proposed resonance transmission has many applications in microwave devices such as couplers, filters, and phase inverters. © 2014 AIP Publishing LLC.