The multiband behavior of the Sierpinski patch antenna is described in this paper, and a new technique to improve the multiband behavior from the p i n t of view of the radiation patterns is intrcduced in this paper.Introduction The use of fractal geometries is a new solution to design multiband antennas. The multiband behavior of the Sierpinski monopole has been presented and discussed, such monopole displayed a similar behavior over five bands from both the input return loss and the radiation patterns p i n t of view [l-21. The Sierpinski patch antenna has been analyzed using an Iterative Nehvork Model [ 3 ] and the input impedance presented a log-periodic distribution tof the resonant frequencies with a logperiod that is similar to the scale factor between the triangles. The next logical step is to explore the multiband behavior of the Sierpinski patch antenna from the point of view of the radiation patterns.

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Abstract-The main interest in the design of a miniature Microstrip Patch Antenna (MPA) is its small size in conjunction with the well-known advantages of a MPA (cost, profile, weight). However there is a big constraint on the bandwidth limitation either in a miniature antenna or in a MPA. The proposed solution to overcome such problem is to couple a miniature parasitic resonator to the miniature active patch forming a wideband small stacked microstrip patch antenna.

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-A new top-loaded reduced-sized dual-band monopole antenna for wireless communications is presented. The antenna provides better than -15 dB input return loss and keeps the same radiation pattern over both bands. In addition, a low-profile performance is achieved.

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