Active patch antennas integrated with Rx/Tx front end

In this paper is described one method for variation of impedance of patch antennas. With this method both phase and magnitude of impedance can be varied in wide range of different values. This gives us possibility of integration of antenna with variety of different active microwave semiconductors. First of all we described method and its characteristics such as values of patch impedance, which can be attained, and later we demonstrated application of method in case of patch antenna integrated with low noise amplifier (LNA) in receiver.