Wideband Endfire 3-D-Printed Dielectric Antenna With Designable Permittivity

Jin Huang, Shengjian Jammy Chen, Zhenghui Xue, Withawat Withayachumnankul, Christophe Fumeaux

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


This letter presents a three-dimensionally (3-D)-printed low-profile endfire dielectric antenna with wideband performance. The proposed device comprises four dielectric sections that are designed with tapered permittivities and sizes to achieve impedance-matched surface-wave launching over a wide bandwidth. The effective permittivity of dielectric blocks is precisely controlled within the range of 2.0 to 8.3 through varying the infill factor of the 3-D printing process. The relation between permittivity and infill factor has been experimentally validated and compared against Bruggeman effective medium approximation theory. Experimental results show that the proposed antenna exhibits a wide impedance bandwidth of 57.7% from 6.9 to 12.5 GHz, a low tilt angle of around 20° over the endfire direction, and a high realized gain above 10 dBi from 7.2 to 12.5 GHz. All these findings demonstrate that 3-D printing technology can be leveraged to conveniently fabricate sophisticated antennas with controllable material properties.

Original languageEnglish
Pages (from-to)2085-2089
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number11
Publication statusPublished - Nov 2018
Externally publishedYes


  • Designable permittivity
  • effective medium theory
  • surface-wave antenna
  • three-dimensional (3-D) printing


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