A wireless sensor network (WSN) is a collection of sensor nodes organized into a cooperative network. These nodes communicate through a wireless antenna. Reduction in physical size and multiband operation is an important requirement of WSN antenna. Fractal antenna is used for miniaturization and multiband operation. The self-similar or self-affine and space filling property of fractal geometry ...

Abstract— A novel compact CPW ultra-wideband (UWB) antenna combined with a compact band-selective filter is proposed. The proposed antenna without filter satisfies the return loss requirement of less than −10 dB over the frequency range of 3.0 GHz to 12.1GHz. The optimized antenna has dimensions of 10×16mm2 on a Teflon substrate (εr = 3.48) with good radiation characteristics and is easy to fab...

In this paper we study neutral atoms of nuclear charge Z in a strong constant magnetic eld of strength B. We improve the bound on connnement to lowest Landau band given by Lieb, Solovej and Yngvason in LSY94a]. This permits to calculate the asymptotic form of the quantum current of atoms in the parameter region Z 4=3 B Z 46=27 .

In Fourier spectroscopy a tilting of the wavefront while the interferogram is being recorded gives rise to false structure in the computed spectrum. It is desirable to automatically tilt compensate the interferometer. One of the compensation schemes is to form a Mobius band through the interferometer. This paper discusses details of the construction of a Mcibius interferometer and test results ...

Wideband application put a new demand on antennas pertaining to size, gain, efficiency, bandwidth and more. This paper presents the design and analysis of fractal antenna which uses the self similarity property of fractal geometry. This unique property is exploited to develop antenna elements that are wideband and compact possessing highly desirable properties. The presented antenna is circle i...

A frequency agile triple band microstrip antenna using defected ground structure for WLAN/WiMAX application is presented, in which frequency agility is electronically achieved by changing the bias voltage of varactor diode. A defected ground structure rectangular patch with dual inverted L-shaped fed with a cross shaped strip line is used to achieve multiple bands. Simulated results are validat...

In this paper, the design of a coaxial feed single layer rectangular microstrip patch antenna for IEEE802.11b application is presented. The proposed antenna is designed by using substrate FR4_epoxy having permittivity of about 4.4 and tangent loss of 0.013. The characteristics of the substrate are designed and to evaluate the performance of modeled antenna using HFSS v.11 EM simulator, from Ans...

An effective technique to design compact low pass filter has been proposed in this paper. The proposed method is highly effective for L-band applications. Low impedance microstrip lines are arranged such that they work as open stubs to increase the selectivity of the filter. Using the proposed technique about 57% size reduction has been realized with sharper roll off characteristics. An empiric...

The basic shape structures are designed at frequency 2.4 GHz based on radiating structure 5 and 5.2 GHz based on radiating structure 3. The frequency bands that have been chosen are based on the IEEE standards. Then both structures are combined to achieve dual band resonant. The techniques that have been used are by designing the 3.5 shaped by using microstrip, planar and coplanar waveguide str...

In this paper, we describe the design and implementation of a rake receiver for use with ultra wide band (UWB) systems. The rake receiver uses spread spectrum modulation (SSM) aided by kasami sequence generator. The combination is found to be effective in dealing with multipath fading and signal to noise ratio. The design is initially simulated using MATLAB 7.10 and is implemented using a HDL c...