Electronically Reconfigurable FSS-Inspired Transmitarray for 2-D Beamsteering

Joao R. Reis, Rafael F.S. Caldeirinha*, Akram Hammoudeh, Nigel Copner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Citations (SciVal)


A novel electronically reconfigurable transmitarray (TA) with 2-D beamsteering capability is presented in this communication. The proposed structure, inspired on frequency selective surfaces loaded with varactor diodes, allows the phase range of each TA element to be individually controlled enabling an automated steering of the main lobe of an original antenna pattern, in both elevation and azimuth planes (2-D beamsteering). This has been demonstrated on a 5×5 unit-cell stacked structure with active feeding, coupled to the aperture of a standard gain horn antenna. A complete electromagnetic study using CST Microwave Studio is presented to evaluate and characterize the TA elements and the effect the proposed feeding network has on the structure's behavior. Following initial simulations, a prototype of the active TA has been characterized. Automated antenna beamsteering with ranges up to Az = 28° and El = 26° and 1° of angular resolution, is achieved by means of electromagnetic simulations and validated against experimental results at 5.2 GHz.

Original languageEnglish
Article number7967855
Pages (from-to)4880-4885
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number9
Publication statusPublished - Sept 2017
Externally publishedYes


  • Antenna arrays
  • antennas
  • beam steering
  • frequency selective surfaces (FSS)
  • transmitarray (TA)


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