الفهرس | Only 14 pages are availabe for public view |
Abstract In this thesis a planar patch antenna for mobile communication applications operating at 1.8, 3.5, and 5.4 GHz, is proposed. A planar microstrip patch antenna (MPA) consists of two F-shaped resonators that enable operations at 1.8 and 3.5 GHz, while operation at 5.4 GHz is achieved when the patch is truncated from the middle. The proposed planar patch is printed on a low-cost FR-4(𝜀𝑟=4.3) substrate that is 1.6 mm in thickness. We obtained a good agreement between simulation and measurement results. The proposed antenna has an elliptically shaped radiation pattern at 1.8 and 3.5 GHz, while the broadside directional pattern is obtained at the 5.4 GHz frequency band. At 1.8, 3.5, and 5.4 GHz, the simulated peak realized gains of 2.34, 5.2, and 1.42 dB are obtained and compared to the experimental peak realized gains of 2.22, 5.18, and 1.38, dB at the same frequencies. The results indicate that the proposed planar patch antenna can be utilized for mobile applications such as digital cellular systems (DCS), worldwide interoperability for microwave access (WiMAX), and wireless local area networks (WLAN). A new reconfigurable antenna is presented. The Reconfigurability is obtained by inserting avaractor diode in a small rectangular cut in the patch. The technique is implemented using two lumped variable capacitors (Varactor diode), and adding two parasitic patches connected at the corners of the microstrip patch antenna. These works provide various operating frequencies; the frequency range from 1.52 to 2.55 GHz, from 3.3 to 3.55 GHz, and 5.15 GHz. There are many practical applications such as GSM, Gps, WLAN, WIMAX, etc. The reconfigurable antenna changes the application according to a change in the capacitance of the Varactor diode. CST software was used for the simulation. |