A slot-loaded composite right/left-handed transmission line for a zeroth-order resonant antenna with improved efficiency

Seongmin Pyo, Sang Min Han, Jung Woo Baik, Young Sik Kim

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In this paper, a new composite right/left-handed transmission line (CRLH-TL) with equilateral slots is proposed for efficiency-improved zeroth-order resonant antennas. A 1-D infinitesimal equivalent transmission line circuit model is derived, and the characteristic impedance and dispersive relation are theoretically computed. Based on the isotropic arranged unit cells of the slot-loaded composite right/left-handed transmission line (SL CRLH-TL), 2-D zeroth-order resonators are designed for planar magnetic monopole antenna applications. The SL CRLH-TL provides the zeroth-order resonance with some degradation of the quality factor. Therefore, a highly efficient radiating resonator can be designed with higher gain at the zeroth-order frequency. The theoretical approach was verified by the experimental results. The radiation efficiency was improved by up to 45.6% for the nine-rectangular zeroth-order resonant antenna and 21.4% for the seven-hexagonal zeroth-order resonant antenna without degrading the radiating performance. Moreover, the antenna gains of these two antennas were enhanced by 7.56 and 6.31 dB, respectively, due to the increase of the radiation efficiency.

Original languageEnglish
Article number5290132
Pages (from-to)2775-2782
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume57
Issue number11
DOIs
Publication statusPublished - 2009 Nov 1

Keywords

  • Composite right/left-handed transmission line (CRLH-TL)
  • Magnetic planar monopole antenna
  • Metamaterial
  • Slotted ground structure
  • Zeroth-order resonator

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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