An electromagnetically coupled small broadband monopole antenna has been investigated. The antenna structure consists of a circular disk-loaded monopole and a probe with a spiral strip line monopole packed within a small electrical volume. Broad bandwidth can be achieved through electromagnetic coupling between these two monopoles that generate two resonances closely spaced in frequency. The antenna with a circular disk has an electrical size kr of 0.563 and has 430 MHz of impedance bandwidth for VSWR<2 with a centre frequency at 2.185 GHz, which is ≃19.7% of a fractional bandwidth. Measured efficiency of the circular disk-loaded antenna is 98% at its centre band region. The gain of the antenna is >1.55 dBi and the antenna has good omni-directional radiation characteristics.
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Jung et al. (2007) studied this question.
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