Gain and bandwidth enhancement of ferrite-loaded CBS antenna using material shaping and positioning

Mikal Askarian Amiri, Constantine Balanis, Craig R. Birtcher

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Loading a cavity-backed slot (CBS) antenna with ferrite material and applying a biasing static magnetic field can be used to control its resonant frequency. Such a mechanism results in a frequency-reconfigurable antenna. However, placing a lossy ferrite material inside the cavity reduces the gain and impacts the impedance bandwidth. This letter develops guidelines, based on a nonuniform applied magnetic field and nonuniform magnetic field internal to the ferrite specimen, for the design of ferrite-loaded CBS that enhance its gain and tunable bandwidth by shaping the ferrite specimen and judiciously locating it within the cavity. To validate the modeling, simulations were performed using ANSYS's Maxwell 3D and HFSS, and they were compared to measurements conducted in the Arizona State University (ASU) anechoic chamber.

Original languageEnglish (US)
Article number6511976
Pages (from-to)611-614
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Volume12
DOIs
StatePublished - May 22 2013

Keywords

  • Cavity-backed
  • ferrite
  • gain
  • impedance match
  • tunable bandwidth

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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