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Abstract
In this paper, a novel design of a compact planar ultra wide band (UWB) monopole antenna with triple band notched characteristics has been presented. The antenna has a unique shape and has been fed through a 50 Ω microstrip feedline. The strength of the antenna lies in three band notched properties for WiMax system at 3.3 - 3.7 GHz, WLAN IEEE 802.11a at 5.15 - 5.85 GHz and X band satellite communication at 7.25 - 8.395 GHz. The notched bands have been achieved by incorporating an inverted U-slot etched on the radiator patch, an inverted C-slot also on the radiator patch and a U-slot on the microstrip feed line. In order to achieve FCC defined impedance bandwidth of 7.5 GHz, a rectangular cut in the ground plane has been introduced along with staircase structure in the bottom edge of the radiator. The proposed antenna is having a compact size of 30 X 30 X 1.6 mm3 and exhibits a large bandwidth from 2.8 GHz to 10.7 GHz. The antenna has been successfully simulated and fabricated. The radiation pattern is omni-directional in H-plane and the E-plane exhibits dipole like radiation pattern. The gain of the antenna is stable across the whole operating frequency band except at three notched bands.
Highlights
Over the last few years, ultra wide band (UWB) technology has emerged as one of the most attractive options for short range communication coupled with high rate of data transmission at very low energy level utilizing pulse based communication
Since the time Federal Communication Commission (FCC) in Mar 2002 approved [1] the release of -10 dB unlicensed bandwidth of 7.5 GHz ranging from 3.1 10.6 GHz with effective isotopic radiated power (EIRP) spectral density of -41.3 dBm/MHz, intense research activities have been reported both from academia and industry with a view to exploit its full potential
This paper presents a novel compact UWB antenna of size 30 x 30 mm2 with triple band-notched features fabricated on FR4 substrate
Summary
Over the last few years, UWB technology has emerged as one of the most attractive options for short range communication coupled with high rate of data transmission at very low energy level utilizing pulse based communication. Various techniques of band rejection capability involves etching slots of various shapes and sizes on radiating patch, microstrip lines or ground plane [3]-[11], embedding stubs in the radiator patch or in the vicinity of feedline [12]-[14], use of metamaterial [15]-[17] or electromagnetic band gap structure [18]-[20] Using these techniques, a number of antenna designs have been reported in which single band notch [21]-[22] , dual band notch [23]-[24], triple band notch [25]-[26] and quadruple band notch [27] have been reported the most. The proposed antenna exhibits dipole like radiation pattern in the E-plane and omnidirectional radiation pattern in H-plane for the entire frequency range of 3.1 to 10.6 GHz
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