Spiral-type terahertz antennas and the manifestation of the Mushiake principle.
We report on the experimental and theoretical study of the resonant eigenmodes of spiral-type terahertz antennas. The analysis is carried out for a varying number of spiral windings. For larger numbers the structure possesses a self-complementary property which allows the application of the Mushiake principle predicting that the impedance of such structures is half the impedance of free space. This permits to observe an equal and frequency independent reflection and transmission coefficient. This property makes the spiral-type terahertz antenna not only a fascinating example of a medium supporting strong resonances in the long wavelength limit but also a medium which can be easily and reasonably homogenized at higher frequencies. This is in stark contrast to most of the existing metamaterials.
Singh
Ranjan
R
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Rockstuhl
Carsten
C
Menzel
Christoph
C
Meyrath
Todd P
TP
He
Mingxia
M
Giessen
Harald
H
Lederer
Falk
F
Zhang
Weili
W
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D055096:Optical Devices; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation