Mobile communications handsets with internal antennas become more popular everyrnday. These integrated antennas must be designed to fit into a small volume, with anrnarbitrary shape. Indeed, the design of modern handsets is mostly fashion-oriented, andrnthe antennas must be adapted to these requisites, without detriment to their matchingrnor radiating performance [12]. The present study focuses on how a change in some ofrnthe antenna geometric parameters, such as its height, may affect its actualrnperformance.rnDual band antennas are defined as:â€ Antennas that are useful in situations where thernantenna is required to operate in two distinct frequencies which may be too far apart for arnsingle antenna to perform efficiently at both frequencies. [8] In this thesis work differentrndual band patch antennas for mobile phones are designed, simulated (using the EMPIRErnsoftware) and the performance of which is compared based on the standard performancernmeasures.rnThe antenna put into consideration is said to be dual band if it operates on any two of thernbands: GSM, DCS, PCS, IMT2000 and Bluetooth bands. A total of 10 patch antennarntypes: 5 from multiresonator and 5 from reactively loaded patch antennas are considered.rnOf these the pins loaded patch antenna and a patch loaded with adjustable air gap havernbetter performance as they are closer to the regulatory performance measurementrnstandards compared to the rest. For pins loaded patch antenna the BW is 4.94% aroundrnGSM1800 ( f MHz c = 1800 ), 3.04% around IMT ( f MHz c = 2170 ) and 4.08% aroundrnBluetooth ( f MHz c = 2450 ). For the patch loaded with adjustable air gap the BW is 10%rnaround GSM900 ( f MHz c = 900 ) and 2.33% around GSM1800 (DCS) ( f MHz c = 1800 ).rnIn both cases the BW is measured for S 9dB 11rnÂ£ âˆ’ which is the regulatory standard forrnmeasuring impedance bandwidth. As these two antenna structures are closer to thernregulatory standards of antenna performance measurement, they are suitable for dualrnband mobile communication handsets except that in the former case the shorting pinsrncomplicate the fabrication process.