A frequency agile, ultralow-profile, complementary split ring resonator-based electrically small antenna

Ming Chun Tang, Richard W Ziolkowski

Research output: Contribution to journalArticle

5 Scopus citations


The frequency agility of an electrically small, ultralow-profile, VHF-UHF antenna, which has evolved from a complementary split ring resonator unit cell design, is studied numerically. Simulation results demonstrate that when a varactor is integrated into the original 300-MHz passive antenna and its capacitance is varied linearly from 0 to 5.8 pF, a tuning ratio of 2.02:1 and an effective fractional bandwidth of 67.6% (approximately 679.74 times the original value) is achieved while maintaining |S11| < -10dB (VSWR < 2), and a stable dipolar directivity pattern over the entire bandwidth. The overall dimensions of the proposed antenna at the maximum frequency f max = c/λmin are 0.03(λmin) 2 × 0.0066λmin.

Original languageEnglish (US)
Pages (from-to)2425-2428
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number10
Publication statusPublished - Oct 2013



  • ESA
  • frequency agile
  • low-profile

ASJC Scopus subject areas

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

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