الفهرس 
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Abstract
Microstrip Patch Antennas received great attention in wireless communication systems due to their capability to operate in different frequency bands and have a variety of pattern and polarization. Moreover they have attractive features such as low profile, light weight, easy to fabricate and ability to achieve dual or multiple frequency operations.This thesis presents the analysis and design of a multi-wideband compact microstrip patch antennas based on slot matching concept. The first design of the antenna is a compact conventional patch antenna with a multi-band parasitic resonator element partly enclosed to the patch in order to increase the number of resonance frequencies in the operated frequency range. To achieve and control more resonant frequencies of the proposed antenna in the desired range, two slots inserted into the patch. Switches are integrated to the slots to enhance the antenna operation. By adjusting the statuses of the switches (that optimally fixed along the slots) we can vary the values of the resonance frequencies.In order to increase the number of resonance frequencies and to enhance the bandwidth and gain of the first proposed antenna at each resonant frequency, a second design antenna is proposed in stacked configuration. A second layer consists of another substrate and a patch is placed on the top of first proposed antenna. A parasitic resonator element and slots with switches are added to the patch of the second layer in positions and dimensions exactly as those in the first layer. The feeding is through the patch of the bottom layer (fed patch). The parasitic resonator elements in the top and in the bottom layers are shorted with the ground plane through a ground shorted strip.The two proposed designed antennas are performed using Zeland IE3D software. They are capable to achieve a return loss less than -10 dB and VSWR 2 in the range from 2 to 5 GHz. The suggested designs give more resonant frequency bands with reasonable frequency bandwidths than the conventional antenna.The simulation results of the Zeland IE3D software are compared with the simulation results using CST Microwave Studio software. Moreover the simulated data are compared with measurement data previously published in the literature. The comparisons verify and support the simulation results of the proposed designed antennas using the Zeland IE3D software.