EXPERIMENTSAND SIMULATIONSOFA COMPACT UWB PULSE GENERATOR COUPLEDTO DIFFERENTANTENNA STRUCTURES

II. EXPERIMENTALSETUP Theobjective ofthis study istodesign acompact ultra Theexperimental setupconsists ofa compactpulse wideband(UWB)highpowerradiating systemanddo powergenerator, a trigger unit,a TEM-hornand someinitial testing. Theprimary energy source usedfor diagnostics toreceive thegenerated electrical signal. this system isthree batteries that deliver aninput powerof Thereisunfortunately amismatch inimpedance between around 1kW tothepulsed powerunit. Thehighvoltagethepulse generator (100Q)andtheantenna (50Q).This unitgenerates voltage pulses withamplitudes close to results inreflections andanoutput signal thatisabit 100kV atapeakcurrent level of1kA intoamatchedlowerthanan idealcoupling wouldgenerate. The load, 100Q.Therise timeofthevoltage pulse isless than experiments werecarried outinananechoic chamber with 1nsandthemaximumpulse repetition frequency ofthe theoscilloscope andtriggering equipment placed outside unitis1kHz.Inanattempt tomaximize theradiated thechamber. Thediagnostics usedconsisted ofaD-dot poweroutfromthis pulsed powersystem different typesprobe, abalunandafast oscilloscope. TheD-dotprobe ofantenna structures havebeenstudied. Thereference was placed4.5m fromtheantenna feedpointin antenna inthis study isaTEM-horn. A D-dotprobe is alignment withtheantennas axial direction. Thesystem usedtomeasuretheelectrical field radiated fromthe inside thechamber isshowninFig. 1. antenna structure. A numerical modeliscreated inthesoftware MicroStripes andusedtosimulate thesystem. Thesimulated electrical field strength iscompared tothemeasured signal fromtheexperimental work. Radiation patterns and s-parameters arealsodiscussed andpresented inthis paper.