![]() In both cases, bandwidth was improved by adding nondriven antenna elements with slightly higher resonant frequencies on the opposite side of the dielectric from the driven element. Reduction of size of the patch and the loop antennas was accompanied by decreased bandwidth. The resonant frequency of the antenna with the metamaterial substrate was reduced somewhat more than what would be expected from the natural pc board substrate alone. 3.12 was used for a patch antenna, where a ground plane larger than the size of the patch was placed at the bottom side of the substrate. A dielectric substrate similar to that shown in Fig. A greater decrease of resonant frequency was obtained when the split ring resonators were included in the same plane as the loop, both within the loop and outside it, resulting in a size reduction of 38 percent. The resonant frequency with the metamaterial substrate was reduced by 23 percent, which indicates the size reduction. A loop antenna with approximately one wavelength perimeter that resonated in air at 2.58 GHz was mounted over a stack of pc boards on which were etched groups of split ring resonators as shown in Fig. The aim here was to significantly decrease the physical size at the operating frequency. ![]() Patch and loop antennas were designed with metamaterial dielectric substrates. ![]()
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