Photoconductive thz antenna designs with high radiation efficiency, high directivity, and high aperture efficiency

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28 Citations (Scopus)

Abstract

Several linear polarized photoconductive terahertz antennas are reported and compared. A bowtie-shaped antenna, which is a variation on the standard photoconductive dipole antenna, is presented. It has satisfactory terahertz (THz) radiation performance characteristics. This bowtie-shaped antenna is combined with a silicon-based lens and with an artificial magnetic conductor (AMC) to enhance its directivity properties. These antennas provide the baseline designs in our study. A capacitively loaded dipole antenna is introduced, which naturally leads to an array implementation. The simulation results show that the peak directivity of a two-element array can be increased by 2.0 dB. The directivity and front-to-back ratio of the capacitively loaded dipole array are further enhanced by introducing a meta-film superstrate. Superdirective and high-efficiency performance characteristics are demonstrated. A THz grid antenna and its generalization to a grid antenna array are also developed. Comparisons demonstrate that these planar designs significantly outperform the lens-based reference case.

Original languageEnglish (US)
Article number6650008
Pages (from-to)721-730
Number of pages10
JournalIEEE Transactions on Terahertz Science and Technology
Volume3
Issue number6
DOIs
StatePublished - Nov 2013

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antenna design
directivity
antennas
apertures
Antennas
Radiation
radiation
dipole antennas
Dipole antennas
Lenses
grids
lenses
antenna arrays
Antenna arrays
conductors
dipoles
Silicon
silicon
simulation

Keywords

  • Antenna arrays
  • metamaterials
  • photoconductive switches
  • Terahertz antenna

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation

Cite this

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title = "Photoconductive thz antenna designs with high radiation efficiency, high directivity, and high aperture efficiency",
abstract = "Several linear polarized photoconductive terahertz antennas are reported and compared. A bowtie-shaped antenna, which is a variation on the standard photoconductive dipole antenna, is presented. It has satisfactory terahertz (THz) radiation performance characteristics. This bowtie-shaped antenna is combined with a silicon-based lens and with an artificial magnetic conductor (AMC) to enhance its directivity properties. These antennas provide the baseline designs in our study. A capacitively loaded dipole antenna is introduced, which naturally leads to an array implementation. The simulation results show that the peak directivity of a two-element array can be increased by 2.0 dB. The directivity and front-to-back ratio of the capacitively loaded dipole array are further enhanced by introducing a meta-film superstrate. Superdirective and high-efficiency performance characteristics are demonstrated. A THz grid antenna and its generalization to a grid antenna array are also developed. Comparisons demonstrate that these planar designs significantly outperform the lens-based reference case.",
keywords = "Antenna arrays, metamaterials, photoconductive switches, Terahertz antenna",
author = "Ning Zhu and Ziolkowski, {Richard W}",
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T1 - Photoconductive thz antenna designs with high radiation efficiency, high directivity, and high aperture efficiency

AU - Zhu, Ning

AU - Ziolkowski, Richard W

PY - 2013/11

Y1 - 2013/11

N2 - Several linear polarized photoconductive terahertz antennas are reported and compared. A bowtie-shaped antenna, which is a variation on the standard photoconductive dipole antenna, is presented. It has satisfactory terahertz (THz) radiation performance characteristics. This bowtie-shaped antenna is combined with a silicon-based lens and with an artificial magnetic conductor (AMC) to enhance its directivity properties. These antennas provide the baseline designs in our study. A capacitively loaded dipole antenna is introduced, which naturally leads to an array implementation. The simulation results show that the peak directivity of a two-element array can be increased by 2.0 dB. The directivity and front-to-back ratio of the capacitively loaded dipole array are further enhanced by introducing a meta-film superstrate. Superdirective and high-efficiency performance characteristics are demonstrated. A THz grid antenna and its generalization to a grid antenna array are also developed. Comparisons demonstrate that these planar designs significantly outperform the lens-based reference case.

AB - Several linear polarized photoconductive terahertz antennas are reported and compared. A bowtie-shaped antenna, which is a variation on the standard photoconductive dipole antenna, is presented. It has satisfactory terahertz (THz) radiation performance characteristics. This bowtie-shaped antenna is combined with a silicon-based lens and with an artificial magnetic conductor (AMC) to enhance its directivity properties. These antennas provide the baseline designs in our study. A capacitively loaded dipole antenna is introduced, which naturally leads to an array implementation. The simulation results show that the peak directivity of a two-element array can be increased by 2.0 dB. The directivity and front-to-back ratio of the capacitively loaded dipole array are further enhanced by introducing a meta-film superstrate. Superdirective and high-efficiency performance characteristics are demonstrated. A THz grid antenna and its generalization to a grid antenna array are also developed. Comparisons demonstrate that these planar designs significantly outperform the lens-based reference case.

KW - Antenna arrays

KW - metamaterials

KW - photoconductive switches

KW - Terahertz antenna

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