One-turn stub-loaded loop patch antenna on a small ground plane

Jesper Thaysen, Kaj Bjarne Jakobsen

Research output: Contribution to journalJournal articleResearchpeer-review


A small 1.1-cm3 one-turn loop patch antenna located 2.5 mm above an 18 × 25 mm ground plane separated by a dielectric substrate with relative permittivity of 9.8 is presented. By varying the length of a thin quarter-wavelength matching line, it is possible to change the resonant frequency. An RLC circuit model is used to determine the minimum quality factor Q. It is shown that the proposed loop yields a bandwidth performance close to the theoretical limit. The antenna has a 14.5% bandwidth at the resonant frequency of 2.04 GHz.
Original languageEnglish
JournalMicrowave & Optical Technology Letters
Issue number2
Pages (from-to)126-128
Publication statusPublished - 2005


  • balanced loop
  • finite ground plane


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