Hexaferrite Substrate Versus Impedance Matching for Tuneable Patch Antenna Miniaturisation

Oliver N James, Geoffrey Hilton, Mark Beach

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Novel hexaferrite substrates and impedance matching networks are both means to deliver electrically small antennas (ESAs). The performance characteristics of each are often restricted to a discussion on the reflection coefficient S11, without consideration of full radiative characterisation. In this work the radiation efficiency and pattern of a hexaferrite patch ESA and impedance-matched sub-resonant Rogers RT5880 patch were compared. The efficiencies of each technique were found to be low, while the pattern of the sub-resonant patch displayed considerable divergence from the half-wavelength behaviour of the hexaferrite patch. The stability of the magnetically-tuned radiation pattern of the hexaferrite patch was then demonstrated over a tuned bandwidth of 32.1%.
Original languageEnglish
Title of host publication2018 12th European Conference on Antennas and Propagation, EuCAP 2018
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Electronic)9781785618161
ISBN (Print)9781785618154
Publication statusE-pub ahead of print - 10 Dec 2018
Event12th European Conference on Antennas and Propagation - London, United Kingdom
Duration: 9 Apr 201813 Apr 2018
Conference number: 12


Conference12th European Conference on Antennas and Propagation
Abbreviated titleEuCAP
Country/TerritoryUnited Kingdom
Internet address


  • Electrically small antennas
  • hexagonal ferrite
  • reconfigurable antennas
  • tuning
  • UHF antennas


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