A compact monopole antenna possessing triple resonance (<TEX>f₁</TEX>, <TEX>f₂</TEX>, <TEX>f₃</TEX>) characteristics for (USB) dongle applications is presented. The resonance characteristic <TEX>f₁</TEX> is determined by the overall length of the antenna. The monopole antenna acts as the main radiator for <TEX>f₃</TEX> as well as the coupling feeding structure for the parasitic resonators in <TEX>f₁</TEX>, <TEX>f₂</TEX>. The resonance characteristic <TEX>f₂</TEX> is achieved by a combination of the capacitance formed by the coupling between the top and bottom parasitic substrate resonators and the inductance generated by a via bridging the two parasitic resonators.
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Lee et al. (2012) studied this question.
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