Multilayer dielectric cavity antenna design for wide bandwidth

K. J. Lee, J. A. Lee, M. Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The dimension optimization of a rectangular cavity antenna is presented in this letter. The cavity antenna is fabricated in a multilayer substrate. The antenna operation is based on lowest order TE 101 cavity mode. The antenna performance can be predicted using a simple equivalent model for a dielectric cavity. The estimated antenna bandwidth using the quality-factor of the cavity model indicates that the larger aperture and thinner thickness is the wider bandwidth becomes. In this letter, however, the aperture size is limited to operating in a single mode. The antenna sample is fabricated in multilayer FR4 substrates with a dielectric constant of 4.4, so that it operates at 7.2 GHz. The antenna with enhanced bandwidth has an aperture size of 32 × 10 mm 2 and total thickness of 4.3 mm. The measured 10-dB bandwidth is 12.1% and the radiation pattern confirms that it operates in a single mode.

Original languageEnglish
Pages (from-to)2046-2049
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number9
Publication statusPublished - 2012 Sept


  • bandwidth
  • cavity antenna
  • dielectric resonator
  • multilayer substrate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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