A printed quadruple band-notched ultra-wideband (UWB) antenna characteristic is presented. The designed UWB antenna has a size of 32 mm × 30 mm × 1.6 mm and covers an impedance bandwidth off 2.9–14.5 GHz for the entire frequency band. The entire frequency band maintains voltage standing wave ratio (VSWR) <2, except at WiMAX (3.1–3.6 GHz), WLAN (4.92–6.12 GHz), downlink of X-band for satellite communication systems (7.5–8.4 GHz), and X-band (10.2–11 GHz). By inserting a pair of L-shaped slots into the radiating element, a H-shaped resonator and rectangular split-ring resonators are closely arranged to the microstrip feed-line, alongside the measured impedance bandwidth of 129%. The fabricated antenna radiation pattern and return loss is presented.

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ABSTRACT1This revieW; describes recent advances in oplical fiber sensors for smart structures. After discussing the fabricalion technology and strain sensing of fiber-oplic sensors in a brief inb"Oduction. the detailed accounts of signal processing bhniques empolyed in them are given. The application areas of fi\Jer-oplic sensors are also described briefly wi th necessary references. r;uture trend of work is i ndicated in the concludi ng remarks.1

This paper presents a band notched WLAN self complementary ultra wide band antenna for wireless applications. The proposed antenna encounters a return loss (RL) less than -10 dB for entire ultra wideband frequency range except band notched frequency. This paper proposes a hexagon shape patch, edge feeding, self complementary technique and defective ground structure. The antenna has an overall dimension of 28.3 mm × 40 mm × 2 mm, built on substrate FR4 with a relative dielectric permittivity 4.4. And framework is simulated finite element method with help of high frequency structured simulator HFSSv17.2. the proposed antenna achieves a impedance bandwidth of 8.6 GHz, band rejected WLAN frequency range 5.6-6.5 GHz with vswr is less than 2.

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