Paper on Wireless Networks and Antenna

Added on - 17 Oct 2019

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WIRELESS NETWORKSINTRODUCTIONIn this, paper we will discuss wireless networks and antenna. Further, we will discuss about themethodologies given in two research papers, compare their results, finds advantages and disadvantagesof each and also suggest for a future change. Wireless networks are the types of networks in which allthe nodes or systems are not connected by any type of wired medium for data connection. This type ofnetworks considerably saves cost or provides a less costly process while introducing cables to a building.Generally these are implemented as radio communication and implemented in OSI layer. There areseveral examples of wireless networks like satellite communication, WLANs or wireless local areanetwork, sensors or networks are generally wireless etc. Antenna is an essential component of awireless network as it sends and receives radio signals over different frequencies.INTRODUCTION TO PAPERSFor this we have chosen two research papers, “microwave ablation therapy for the treatment ofhepatocellular carcinoma using double slot interstitial antenna” by Simran Kaur and Surita Maini [1] andDesign of dual band slot antenna for LAN Application” by Ashish Patel [2]. In paper [1], author definesablation therapy as a procedure is used to combat Hepatocellular carcinoma, a type of primary livercancer. This is done with the help of microwaves that are focussed to send energy to abnormal tissues.This method kills only the damaged targeted cells by sending direct radiations with the help of anantenna. In the paper [2], the author explains various types of antennas along with major focus ondesigning of slot antenna. The major advantage of a slot antenna is found to be its property that it canbe cut out of any type of surface, on which they need to be mounted on. Slot antenna typically operateson frequencies that lies between the range 300 Mhz and 24Ghz. A slot antenna can be easilyconstructed by using Micro strip feed line technique, which is majorly used for WLAN systems.THE METHODOLOGIESThe method of antenna design for ablation therapy is explained in paper [1] is known as FEM (FiniteElement Method) which uses maxwell’s equation or fundamental electromagnetic equations to solvethe problem numerically. The information about tissue that will be targeted, EM properties and all theproper initial and boundary conditions are considered.Penne’s bioheat equationρC ∂T/∂t=k2T- ρρbCbF(T-Tb)+ ρSARIt is used to get the temperature profile when electromagnetic waves propagate through the tissues.T=temperature (C),t =time (s), ρ=tissue density (kg/m3),c = specific heat capacity (J/kg K),k is thethermal conductivity (W/m K),ρbis the density of the blood (kg/m3), Cbis the specific heat capacity ofthe blood (J/kg K), Tbis the temperature of the blood ( C), F is the blood flow rate (m /kg s).The field in the tissues results into biological effects, is measured by specific absorption rate SAR(W/m3),shown as:
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