Abdo, Mohammed (PhD)Mammo, Daniel2018-07-062023-11-042018-07-062023-11-042006-09http://etd.aau.edu.et/handle/123456789/6807In this thesis work a single band microstrip patch antenna having a narrow operating bandwidth around the GSM900 band is designed. Theoretical analysis and design was performed by the Finite Difference Time Domain (FDTD) method based on the electromagnetic field solver Empire software. To achieve the multiband antenna that can operate well in the: GSM (Global systems for mobile communication, 890-960 MHz), DCS (Digital cellular systems, 1710-1880 MHz), PCS (Personal Communication services, 1850-1990MHz), and UMTS (Universal Mobile Telecommunications Systems, 1920-2170MHz) bands. One needs to fine-tune the microstrip element to get dual band (GSM900 and GSM1800 bands) operation and to get a third or more operating band, one need to apply a shorted parasitic patch that is electromagnetically coupled to the main radiator. The multiband antenna posses 14-dB around the GSM 900 band of operation and greater than 8-dB return loss with bandwidths enough to cover the intended higher operating bands. As the proposed antenna can achieve such wide operating bandwidth with relatively low profile, it is very suitable for multi-band mobile communication handsets.enGlobal systemsDigital cellular systemsPersonal CommunicationThesis