Article

On the Use of U-Slots in the Design of Dual-and Triple-Band Patch Antennas

IEEE Antennas and Propagation Magazine (Impact Factor: 1.15). 07/2011; 53(3):60 - 74. DOI: 10.1109/MAP.2011.6028422
Source: IEEE Xplore

ABSTRACT The general method of using U-slots to design dual- and triple-band patch antennas is described. In this approach, one starts with a broadband patch antenna, which can consist of one or more patches. When a U-slot is cut in one of the patches, a notch is introduced into the matching band, and the antenna becomes a dual-band antenna. If another U-slot is cut in the same patch or in another patch, a triple-band antenna results. This method is applied to the L-probe-fed patch, the M-probe-fed patch, as well as the coaxially fed and aperture-coupled stacked patches. It is found that the patterns and gains of the dual-and triple-band antennas are similar to those of the original broadband antenna. Because the band notches introduced by the U-slots occur within the bandwidth of the antenna without slots, this method is suitable when the frequency ratios of the adjacent bands are small, usually less than 1.5.

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