A Wideband Resonant Cavity Antenna Assembled Using a Micromachined CPW Fed Patch Source and a Two-Layer Metamaterial Superstrate

Komsan Kanjanasit, Changhai Wang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
302 Downloads (Pure)


This paper reports the development of a wideband resonant cavity antenna (RCA). The RCA device was obtained by using an optimized aperture coupled CPW (coplanar waveguide) fed wideband patch antenna and a metamaterial based superstrate design. The wideband behavior is based on the effects of Fabry-Perot cavity on either side of the resonant frequency of the metamaterial superstrate and the finite size of the superstrate to obtained enhanced gain around this frequency. In addition, the metamaterial superstrate in our work contains two identical layers of a frequency selective surface (FSS) based on a two dimensional patch array rather than dissimilar arrays as used in the previous studies. Two such FSS layers are assembled using a laser micromachined PMMA rim and a SU8 based bonding method. The air spacer based metamaterial design offers better performance by minimizing the dielectric loss between the metallic patch arrays and also offers flexibility in control of the separation between the two FSS layers as well as resulting in a light weight RCA device. The RCA device was designed to operate in the X-band. The dimensions of the compact RCA device are 45×45×24 mm3. The gain of the device was measured to be ~13 dBi with a 3-dB bandwidth of 46% and a corresponding 1-dBi-ripple bandwidth as wide as 40%. The measured impedance bandwidth was 44%.

Original languageEnglish
Pages (from-to)1142-1150
Number of pages9
JournalIEEE Transactions on Components, Packaging and Manufacturing Technology
Issue number6
Early online date24 Sep 2018
Publication statusPublished - Jun 2019


  • Apertures
  • assembly
  • Broadband antennas
  • Coplanar waveguides
  • directive antennas
  • fabrication
  • gain bandwidth
  • Metamaterials
  • partially reflective surface (PRS)
  • Patch antennas
  • Resonant cavity antenna
  • Wideband
  • wideband antenna

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'A Wideband Resonant Cavity Antenna Assembled Using a Micromachined CPW Fed Patch Source and a Two-Layer Metamaterial Superstrate'. Together they form a unique fingerprint.

Cite this