Antennas with synthesized frequency dependency of gain

In this paper, we discuss three approaches to the synthesis of a required frequency dependency of a gain of an antenna. The first approach is turned on the optimization of a resonant series-fed patch array in CST Microwave Studio. Next, a possibility of the synthesis using optimization of an idealized array in MATLAB is mentioned. The last approach exploits a frequency filter integrated into the antenna input; reflection of input power enforces the gain to approach zero.