TY - GEN
T1 - High directivity, lens-less THz photoconductive switch dipole antennas
AU - Zhu, Ning
AU - Ziolkowski, Richard W.
N1 - Publisher Copyright:
© 2014 European Association on Antennas and Propagation.
PY - 2014
Y1 - 2014
N2 - We present several linearly polarized terahertz (THz) photoconductive switch antennas that have been designed for a compressive sensing-based THz imaging system which is currently being brought online. A bow-tie based antenna, including a finite ground plane (on the side of the substrate opposite the bow-tie) and its DC bias lines, is the reference design. By incorporating a metamaterial-inspired artificial magnetic conductor (AMC) structure, the directivity is increased by almost 3 dB at 1.05 THz. The simulation results show that the radiation efficiency of this bow-tie AMC-augmented antenna is above 85% at 1.05 THz. A single capacitively-loaded dipole antenna is then introduced; it has a 12.8 dB directivity, a 11.6 dB realized gain, and a 82% radiation efficiency. By connecting two single capacitively-loaded dipole antennas to form a linear array, higher directivity (14.8 dB), lower sidelobe level (-18 dB) and larger front-to-back-ratio (14 dB) values are achieved. Additional designs will be given in the presentation, including the incorporation of a meta-film structure to decrease the sidelobe levels and increase the front-to-back ratio.
AB - We present several linearly polarized terahertz (THz) photoconductive switch antennas that have been designed for a compressive sensing-based THz imaging system which is currently being brought online. A bow-tie based antenna, including a finite ground plane (on the side of the substrate opposite the bow-tie) and its DC bias lines, is the reference design. By incorporating a metamaterial-inspired artificial magnetic conductor (AMC) structure, the directivity is increased by almost 3 dB at 1.05 THz. The simulation results show that the radiation efficiency of this bow-tie AMC-augmented antenna is above 85% at 1.05 THz. A single capacitively-loaded dipole antenna is then introduced; it has a 12.8 dB directivity, a 11.6 dB realized gain, and a 82% radiation efficiency. By connecting two single capacitively-loaded dipole antennas to form a linear array, higher directivity (14.8 dB), lower sidelobe level (-18 dB) and larger front-to-back-ratio (14 dB) values are achieved. Additional designs will be given in the presentation, including the incorporation of a meta-film structure to decrease the sidelobe levels and increase the front-to-back ratio.
KW - Directivity
KW - Directivity patterns
KW - Input impedance
KW - Photoconductive antennas
KW - THz antennas
UR - https://www.scopus.com/pages/publications/84908636635
UR - https://www.scopus.com/inward/citedby.url?scp=84908636635&partnerID=8YFLogxK
U2 - 10.1109/EuCAP.2014.6902365
DO - 10.1109/EuCAP.2014.6902365
M3 - Conference contribution
AN - SCOPUS:84908636635
T3 - 8th European Conference on Antennas and Propagation, EuCAP 2014
SP - 2640
EP - 2642
BT - 8th European Conference on Antennas and Propagation, EuCAP 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 8th European Conference on Antennas and Propagation, EuCAP 2014
Y2 - 6 April 2014 through 11 April 2014
ER -