3-D Printed 3-D Near-Field Focus-Scanning Lens for Terahertz Applications

Geng Bo Wu, Yuan Song Zeng, Ka Fai Chan, Shi Wei Qu, Jeffrey Shaw, Chi Hou Chan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

6 Citations (Scopus)


This article introduces a novel near-field focus (NFF) lens antenna with a three-dimensional (3-D) focus-steering capability operating at terahertz (THz) frequencies. The antenna consists of a pair of thin discrete dielectric lenses (DDLs) placed above a stationary feed horn. First, we demonstrate that the DDL doublet's in- plane synchronous counter-rotation and co- rotation could scan its focus radially and azimuthally, respectively. A multi-focus synthesis method that compensates the required transmission phases at multi-focus points is developed to further improve its NFF-steering performance. The DDL-based antenna can realize 3-D focus-scanning using a combination of rotation and linear translation mechanisms. The 3-D printing is adopted to fabricate the THz antenna to simplify the manufacturing process and reduce the cost. Both numerical and experimental results demonstrate that the 15 mm-diameter antenna prototype can scan its focus in a 3-D cylindrical space with a diameter of 29 mm and a length of 8 mm at 300 GHz. The proposed 3-D focus-scanning antenna with a large field of view (FoV) of 72° will open new avenues for fast 3-D THz imaging applications.

Original languageEnglish
Pages (from-to)10007-10016
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number11
Publication statusPublished - 1 Nov 2022

Scopus Subject Areas

  • Electrical and Electronic Engineering

User-Defined Keywords

  • 3-D printing
  • focus steering
  • imaging
  • lens
  • near-field-focus (NFF)
  • reconfigurable
  • terahertz (THz)


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