Dual band CPW‐fed monopole antenna with asymmetrical ground plane for bandwidth enhancement

ABSTRACT: Quite recently, it has been found that conducting wireslying on a flat dielectric substrate can propagate Terahertz (THz) wavesin the same way as conducting wires entirely coated with a dielectric(Goubau line). This phenomenon is interesting because it is a basic re-quirement to fabricate integrated circuits at THz frequencies. The exci-tation of planar Goubau line (PGL) waves was found to have a verystrong Goubau mode on conducting wire. The excitation was made witha coplanar waveguide transition fed with a THz signal obtained from avector network analyzer. The Goubau mode on PGL was excited withhigh efficiency (up to 75%.). This is a first step in the design of THzBioMEMS dedicated to living cell investigations. © 2008 Wiley Periodi-cals, Inc. Microwave Opt Technol Lett 50: 2998–3001, 2008; Publishedonline in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23850 Key words: BioMEMS; CPW PGL transition; planar Goubau line;terahertz; transmission line 1. INTRODUCTION