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

Ning Zhu, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


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
Issue number6
StatePublished - Nov 2013


  • Antenna arrays
  • Terahertz antenna
  • metamaterials
  • photoconductive switches

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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