Single, dual and tri-band-notched ultrawideband (UWB) antennas using capacitively loaded loop (CLL) resonators

Chia Ching Lin, Peng Jin, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

207 Scopus citations


Two compact, printed, ultrawideband (UWB) monopole antennas with tri-band notched characteristics are reported. The notched filters are achieved by introducing printed, electrically small, capacitively-loaded loop (CLL) resonators. The directly driven elements consist of printed top-loaded CLL-based monopoles and 50 Ω microstrip feed lines. By adding three CLL elements close to the feed line, band-notch properties in the WiMAX (3.3-3.6GHz), lower WLAN (5.15-5.35GHz) and higher WLAN (5.725-5.825GHz) bands are achieved. Each antenna system is contained on a 27 × 34 mm 2 of Rogers Duroid 5880 substrate. One is designed with three additional CLL elements; the other is achieved with only two. Comparisons between the simulation and measurement results show that these UWB antennas have broadband matched impedance values and stable radiation patterns for all radiating frequencies.

Original languageEnglish (US)
Article number6019020
Pages (from-to)102-109
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Issue number1
StatePublished - Jan 2012
Externally publishedYes


  • Antenna efficiency
  • antenna pattern
  • antennas
  • metamaterials
  • ultrawideband (UWB)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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