Beam steering characteristics of highly directive photoconductive dipole phased array antenna for terahertz imaging application

  • Isha Malhotra
  • Kumud Ranjan Jha
  • G. SinghEmail author


In this paper, the beam-steering characteristics of photoconductive dipole phased array antenna configuration at 1.95 THz is presented. The proposed array antenna configuration with frequency selective surface favourably improves its gain and directivity which is useful to upsurge the imaging capabilities to address the deliberations such as limited depth-of-field (DoF) and size-weight-and-power of the THz source for imaging applications. These are important considerations for applications like stand-off imaging and surveillance of moving targets where the high angular resolution as well as extended DoF are the important parameters for successful detection of concealed explosives. The projected planar profile and compact highly directive \(\left( {2 \times 2} \right)\) small-gap photoconductive dipole phased array antenna can be castoff for the exposure of concealed explosives such as RDX, TNT, and HMX which illustrate their substantial spectral absorption fingerprints in terahertz (1.4–2.2 THz) regime of the spectrum. A simple method of beam-steering has been explored based on phase controlled optical excitation of highly directive small-gap photoconductive dipole array antenna. Further, the effects of uniform progressive phase shift on the beam-steering of uniform linear array (along x-axis) as well as planar array (x-axis and y-axis) is investigated.


Photoconductive dipole antenna Terahertz frequency Frequency selective surface Phased array Uniform current distribution 



The authors are sincerely thankful to the anonymous reviewers for their comments and suggestions to improve the quality of manuscript.


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Electronics and Communication EngineeringJaypee University of Information TechnologySolanIndia
  2. 2.School of Electronics and Communication EngineeringShri Mata Vaishno Devi UniversityKatraIndia
  3. 3.Department of Electrical and Electronics Engineering, Auckland Park Kingsway CampusUniversity of JohannesburgJohannesburgSouth Africa

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