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Keywords:

  • coplanar waveguide (CPW)-fed;
  • bow-tie;
  • slot;
  • transition;
  • asymmetric;
  • UWB

Abstract

This letter presents novel modified coplanar waveguide (CPW) bow-tie slot printed antennas fed by a CPW-to-CPW transition. The proposed modules are miniature shaped, low-profile radiators with bidirectional radiation characteristics, which can be optimally integrated in future ultra wide band transceivers. An innovative asymmetric bow-tie configuration is introduced for the first time and the use of inductively coupled slots for bandwidth enhancement is additionally proposed and experimentally studied. The incorporated tapered CPW-to-CPW transition from Zin ≠ 50 Ω to Zin = 50 Ω offers upgraded impedance bandwidth and compatibility with 50 Ω CPW or coaxial lines. Details of the design procedure and experimental results exhibiting a bandwidth (VSWR <2) of 123% are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1816–1820, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21768