Dual band-reject UWB antenna with sharp rejection of narrow and closely-spaced bands

Ahmad A. Gheethan*, Dimitris E. Anagnostou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


An ultrawideband (UWB) antenna that rejects extremely sharply the two narrow and closely-spaced U.S. WLAN 802.11a bands is presented. The antenna is designed on a single surface (it is uniplanar) and uses only linear sections for easy scaling and fine-tuning. Distributed-element and lumped-element equivalent circuit models of this dual band-reject UWB antenna are presented and used to support the explanation of the physical principles of operation of the dual band-rejection mechanism thoroughly. The circuits are evaluated by comparing with the response of the presented UWB antenna that has very high selectivity and achieves dual-frequency rejection of the WLAN 5.25 GHz and 5.775 GHz bands, while it receives signal from the intermediate band between 5.35-5.725 GHz. The rejection is achieved using double open-circuited stubs, which is uncommon and are chosen based on their narrowband performance. The antenna was fabricated on a single side of a thin, flexible, LCP substrate. The measured achieved rejection is the best reported for a dual-band reject antenna with so closely-spaced rejected bands. The measured group delay of the antenna validates its suitability for UWB links. Such antennas improve both UWB and WLAN communication links at practically zero cost.

Original languageEnglish
Pages (from-to)2071-2076
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number4
Publication statusPublished - Apr 2012


  • Dual-band-reject
  • equivalent circuits
  • ultrawideband (UWB)
  • WLAN

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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