Experimentally Validated, Planar, Wideband, Electrically Small, Monopole Filtennas Based on Capacitively Loaded Loop Resonators

Ming Chun Tang, Ying Chen, Richard W. Ziolkowski

Research output: Contribution to journalArticle

39 Scopus citations


Two planar efficient wideband electrically small monopole filtennas are presented. The first one directly evolved from a common planar capacitively loaded loop (CLL)-based filter. This filtenna possesses a flat realized gain response within the operational band and good band-edge selectivity. The second filtenna consists of a driven element augmented with a CLL structure and with slots etched into its ground plane. It expands the fractional impedance bandwidth of the first case from 6.28% up to 7.9%. It too has a gain response that remains flat over its operational bandwidth and even higher band-edge selectivity. Both filtennas are electrically small: ka < 1. The experimental results, which are in good agreement with their simulated values, demonstrate that both filtennas exhibit excellent impedance matching, high radiation efficiency, flat gain response, and steep skirts at both band edges, as well as producing monopole radiation patterns that are uniform and nearly omnidirectional in their H-planes.

Original languageEnglish (US)
Article number7484724
Pages (from-to)3353-3360
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Issue number8
StatePublished - Aug 2016



  • Bandwidth
  • efficient
  • electrically small antenna
  • filtenna
  • near-field resonant parasitic (NFRP) element
  • planar antenna

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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