Abstract
The ‘Swiss roll’ metamaterial is well suited to operation in the radiofrequency range because it has a low resonant frequency, a strong magnetic response and is electrically very small. However, the elements have to be individually produced, leading to significant variation in the resonant frequency. It is therefore necessary to tune the elements to a target frequency. Three methods for achieving this are described: attaching capacitatively coupled sleeves or discrete capacitors for static tuning, and using a varactor diode to provide electrically controllable tuning. In the last case, the switching time is found to be <1 ms, making dynamic tuning a real possibility.
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