Design And Simulation Of Multiband Microstrip Patch Antenna For Mobile Communications

In this thesis work a single band microstrip patch antenna having a narrow operatingrnbandwidth around the GSM900 band is designed. Theoretical analysis and design wasrnperformed by the Finite Difference Time Domain (FDTD) method based on thernelectromagnetic field solver Empire software.rnTo achieve the multiband antenna that can operate well in the: GSM (Global systems forrnmobile communication, 890-960 MHz), DCS (Digital cellular systems, 1710-1880 MHz),rnPCS (Personal Communication services, 1850-1990MHz), and UMTS (Universal MobilernTelecommunications Systems, 1920-2170MHz) bands. One needs to fine-tune thernmicrostrip element to get dual band (GSM900 and GSM1800 bands) operation and to getrna third or more operating band, one need to apply a shorted parasitic patch that isrnelectromagneticallyrncoupled to the main radiator. The multiband antenna posses 14-dB around the GSM 900rnband of operation and greater than 8-dB return loss with bandwidths enough to cover thernintended higher operating bands. As the proposed antenna can achieve such widernoperating bandwidth with relatively low profile, it is very suitable for multi-band mobilerncommunication handsets.

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