Miniaturized ultra wide band antenna with band-notch characteristic

Abstract

Since the commencement of human civilization, humankind attempts to communicate with each other. It is the process of communication, namely the sharing of information, emotions and feelings that has made the mankind the sterling creation of God. It all started with gestures of handsand sounds produced by the vocal cords and gradually evolved into wired and wirelesscommunication now. The orthodox wireless systems were long-range narrowband systems, but in order to use the available spectrum, now, UWB (Ultra-Wideband) short-range systems are being used whichconsume low power and built using low-priced digital components. The Microstrip Antennae aredesigned to implement UWB systems, because they show effective results for broadband antennae. Ultra-wideband (UWB) antennae are by far the most essential elements for UWB systems. Withthe launch of the 3.1GHz to 10.6GHz band, applications for short-range and high-bandwidthportable gadgets are major research areas in UWB systems. Consequently, the acknowledgmentof UWB antennas in printed-circuit systems within comparatively small substrate areas is of majorsignificance. The presented dissertation exhibits a novel compact sized monopole Ultra-WideBand antenna with dual band-notch characteristic having size of 19x11x1.6mm3. The antenna is fedusing microstrip line on the backside of the substrate and shorted through a 0.5mm radius pin tothe patch on top of the substrate. The U-shaped (crescent) slot embedded in the patch and the Ushapedslot in the microstrip feed line are used to reject the WIMAX band (3.3GHz-3.8GHz) andX-band Downlink range (7.25GHz-7.85GHz), respectively. The proposed antenna has beenprinted on low cost FR4 substrate with relative permittivity of 4.4 and thickness of 1.6mm. The proposed antenna is carefully designed, simulated and tested in order to fulfill the UWB antenna’s pre-defined criteria. The Simulated and Measured results are found to be in goodagreement which show the validity of the suggested design.