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A novel compact coplanar stripline (CPS)-fed antenna for ultra-wide-band (UWB) application is investigated. The proposed antenna consists of a staircase-shaped radiator together with a shorted strip. The prototype is designed on a substrate of dielectric constant 4.4, with an overall size of 25 × 7 × 1.6 mm^sup 3^. The antenna offers a 2:1 voltage standing wave ratio (VSWR) bandwidth from 3.1 to 11.4 GHz, with an average gain of 3 dBi and average radiation efficiency of 75% throughout the band. The measured group delay and transmission characteristics show that the proposed antenna is a good candidate for UWB communication systems.
Introduction: Ultra-wideband (UWB) technology has been expanding rapidly as a promising technology for many applications such as ground penetrating radars, location tracking and data communication, since the FCC specified 3.1-10.6 GHz as the frequency band for UWB radio systems. UWB is conventionally recognised as impulse radio, which transmits data in short pulses and is devoted mainly to short-range applications due to the limitations of the power spectral density of -41.3 dBm/MHz within the UWB band [1]. One of the biggest advantages of UWB is its immunity against fading effects. The modern era of communication is in need of small and miniaturised UWB antennas for many applications such as wireless universal serial bus, wireless body area networks etc. Considerable research efforts have been made towards the design of miniaturised UWB antennas [2-4]. A compact UWB antenna which consists of a microstrip-fed monopole, printed on a 13 × 22.5 mm2 substrate, with a truncated ground plane loaded with a dielectric resonator was discussed in [5]. A small coplanar waveguide-fed UWB antenna was presented in [6] with a fairly compact size of 19 × 16 mm2. The compactness of the antenna was achieved by exploiting a quasi-self-complementary structure together with a tapered radiating slot.
In this Letter, we propose a compact...