Increasing the directivity of resonant cavity antennas with nearfield transformation meta-structure realized with stereolithograpy

Sujan Shrestha*, Hijab Zahra, Muhammad Ali Babar Abbasi, Mohsen Asadnia, Syed Muzahir Abbas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Downloads (Pure)


A simple, nearfield transformation meta-structure is proposed to increase the directivity of resonant cavity antennas (RCA). The meta-structure is comprised of 14 × 14 meta-atoms or so called “unit-cells”, adding localized phase delays in the aperture of the RCA and thus increasing its broadside directivity. A prototype of the meta-structure is additively manufactured using the stereolithograpy process and has a profile of 0.56λ. With the meta-structure integrated with the RCA, it demonstrates a measured broadside directivity of 20.15 dBi without affecting its half-power directivity bandwidth. Benefiting from additive manufacturing, the proposed approach is a simple, light-weight, low-cost, and planar approach that can be tailored to achieve medium-to-high gains with RCAs.

Original languageEnglish
Article number333
Number of pages12
JournalElectronics (Switzerland)
Issue number3
Publication statusPublished - 01 Feb 2021

Bibliographical note

Funding Information:
This work was supported in part by the Australian Research Council (ARC) and in part by the Macquarie University International Research Excellence Scholarship (iMQRES).

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Copyright 2021 Elsevier B.V., All rights reserved.


  • 3D-printed antenna
  • Additive manufacturing
  • Directional antenna
  • Lens antennas
  • Meta-structure
  • Near field transformation
  • Stereolithograpy

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Increasing the directivity of resonant cavity antennas with nearfield transformation meta-structure realized with stereolithograpy'. Together they form a unique fingerprint.

Cite this