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A dualband quasi-isotropic antenna is presented. It is based on the split-ring-resonators (SRRs), which provide a quasi-isotropic radiation pattern with an electrically small size. For the dualband operation, the SRRs are placed orthogonally to reduce the mutual coupling between the elements. A folded dipole structure is applied to the SRR, therefore, the input impedance at each band can be easily...
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