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A novel reconfigurable active oscillator feedback antenna for WiMAX/WLAN applications is presented. By using a rectangular ring with a pair of protruded -shaped strips in the active feedback antenna, two new resonances can be achieved. Also, the proposed rectangular ring with a pair of protruded -shaped strips radiating patch has a major advantage in providing tighter capacitive coupling to the line, in comparison to the known radiating patch. In order to generate DC isolation in the RF path we use a pair of gap distances in the microstrip loop. Also, by using the [S] parameters of the active element a novel design of the microwave oscillator is performed. Simulated and experimental results obtained for this antenna show that the proposed Active Integrated Antenna (AIA) has a good return loss and radiation behavior within the WiMAX/WLAN frequency range.

For the purpose of wideband operations, a printed monopole antenna fed by a microstrip line is investigated. A single element is studied before using it to form a linear array or two-dimensional antenna array system. The antenna element has a single T-shaped radiator fed by a microstrip line. This design is found to be useful for the entire C-band frequency range centered at 6 GHz. The computed return loss is presented that shows a bandwidth of 77%, with a 50 Ω input impedance. The radiation pattern is as presented for the proposed antenna at 6 GHz exhibits very low cross polarization. The effect of varying the monopole dimensions on the antenna performance has also been studied. The single element design was analyzed using the WIPL-D software package, which is based on method of moment solution.

A simple E-shaped microstrip patch antenna model for multiband/wideband operation is proposed to be used in modern wireless communications. The antenna is fed by a microstrip line. By modifying the antenna parameters, the proposed antenna provides three operating bands covering all the desired operation intervals for WLAN/ WiMAX devices. Also the model can be developed to increase the bandwidth of a rectangular microstrip patch antenna. Extensive simulation are done using WIPL-D software package and results of the return loss, VSWR and radiation pattern of the proposed antennas are presented. The WIPL-D software package is based on method of moment solution and the obtained results show the capability of WIPL-D package in designing microstrip patch antennas.