DESIGN ANALYSIS AND CHARACTERIZATION OF BANDPASS FILTER FOR 5.15 to 5.35 GHzFREQUENCY FOR WLAN APPLICATIONS

Abstract

RadioxFrequency (RF)cfiltersoperatingsinmicrowavezfrequencyrangekare essential foraapplications in wirelessxandsatellitefcommunications and military applications.aApplications of these demanded highaperformancecfilters contribute as far asapossibletocasystem'sdcost and size.sMaterials which arezusedtoxconstruct Radio Frequency (RF) filtersahaveplayedfa major role in achievingdthese requirements. Filters which uses planer and dielectric resonator will benefit from high quality dielectric materials. Planar and filters based on printed circuit board (PCB) are more practical and popular to design. In this thesis a planar coupled line filter is designed and tested from a high quality dielectric material. This thesis introduces designing, simulation,dfabricationofxa parallel coupleddmicro strip dBandPassgFilter.Thexfilterishdesignedandsoptimized at 5.15GHzdwithaFBWdof 0.038. This thesis introduces designing. Simulation, fabrication of a parallel coupled micro strip BPF. Theafirststepsindesigningdof this filterdisapproximatedacalculationofditslumpedrcomponent prototype. Firstsstepftodesigndthefiltercistofcalculatelumpedscomponentsprototype. AdmittanceainverterisDusedtodtransformtheflumpedcomponentdcircuitintohanequivalenteform using microwavedstructures. Thexfilterstructurelis fabricated after achieving desired specifications using parallel coupled line technique. ADS software is used for simulation. Optimization is done for achieving selective skirt and desired insertion loss. FR-4 substrate is used to fabricate the simulate filter.