Abstract
Two novel designs for compact reconflgurable antennas are introduced for wireless communication devices. These designs solve the steering frequency problem by tracking the desired resonance frequency or by generating various operating frequency bands to be selected electronically. In the flrst design, the length of the rectangular defected ground structure (RDGS) is electrically adjusted to change the resonant frequency of the MPA. While in the second design difierent turns of spiral AMC ground plane generate frequency bands, or modes, that are selected/optimized to serve difierent communication systems simultaneously. These systems may include various combinations of bluetooth, S-band and wireless local-area network (WLAN). These designs have several advantages as the total antenna volume can be reused, and therefore the overall antenna will be compact, although, the radiation of the MPA is kept flxed without any degradation. The designs are verifled through both numerical simulations and measurement of a fabricated prototype. The results conflrm good performance of the single and multiband reconflgurable antenna designs.
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