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Compact Unit-Cell-Based Semi-Fractal Antenna with Filtering Properties of Interference Bands Embedded with CBP Strips

ABSTRACT In this paper, a compact coplanar waveguide (CPW)-fed Ultra Wide Band (UWB) semi-fractal (SF) antenna with dual band filtering characteristics and enhanced bandwidth is presented. The main features of the proposed SF-antenna are the small size of 15 × 15 mm2 dimensions and band-notched characteristics that are obtained without changing the SF radiator. Dual band-notched characteristics are achieved by having a pair of a specific form of shaped strips embedded as conductor back plane (CBP) and defecting CPW ground surface. Also, wider impedance bandwidth can be achieved with this unit-cell-based fractal structure on the radiator. The measured results illustrate that the proposed SF-antenna operates over the VSWR < 2, except two notched bands (3.25–4.32 and 5.02–5.97 GHz), aimed at suppressing any interference from WiMAX IEEE802.16 (3.3–3.6 GHz), C-band (3.7–4.2 GHz), and wireless local area network IEEE802.11a (5.15–5.825 GHz). The SF-antenna has a desirable radiation pattern and gain characteristics for UWB frequency band range. Measured results of the fabricated SF-antenna with the specific form of CBP, unit-cell patterns for radiator and defected CPW ground are presented.