Miniaturized planar ultra‐wideband slot antenna with an interference suppressing capability

Abstract

This letter presents the experimental results of a novel planar antenna design which is synthesized using simplified composite left/right-handed transmissionline (SCRLH-TL), which is a version of a conventional composite left/right handedtransmission-lines (CRLH-TL), however, with the omission of shunt-inductance in the unit-cell. SCRLH-TL exhibits a right-handed response with nonlinear dispersion properties and a smooth Bloch-impedance distribution. Arranged within the inner slot of the antenna are three smaller rectangular patch radiators. Each patch radiator is embedded with an E-shaped notch, and located in the antenna conductor is a larger E-shaped notch next to the 50-X termination. The E-shaped notches constitute SCRLH-TL property. The gap in the slot between the smaller patches and the conductor next to the larger E-shaped notch determines the impedance bandwidth of the antenna. The dimensions of the smaller patches determine the radiation characteristics of the antenna. The antenna is excited using a conductor-backed coplanar waveguide transmission-line. The antenna covers a bandwidth of 7.3 GHz between 0.7 GHz and 8GHz, which corresponds to 167.81%. In this band, the antenna resonates at 4.75 GHz and 7 GHz; the gain and radiation efficiency at these frequencies are 4 dBi-80% and 3.6 dBi-73%, respectively. The antenna's performance was validated through measurement. The antenna has dimensions of 0.0504k 0 3 0.0462k 0 3 0.0018k 0 , where k 0 is freespace wavelength at 700 MHz. V C 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 00:000-000, 2016.