Aj. Sangster et E. Mcerlean, Electromagnetic levitation of micro-scale actuators using microwave cavityresonators, IEE P-MIC A, 147(5), 2000, pp. 359-363
Citations number
5
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION
The difficulties of achieving electromagnetic levitation of a small conduct
ing disc, by employing the electric field distribution within the capacitiv
e element of a high frequency resonant system, are discussed. It is shown t
hat as the frequency of the system is raised in order to miniaturise it, th
e attractive electric levitation force is increasingly counteracted by an o
ppositely directed Lorentz force. This latter force has to be isolated if e
ffective levitation is to be procured. In 'standing-wave' type microwave re
sonators, the separation of the electric field force and the Lorentz force
calls for careful cavity selection and the judicious use of field-selective
leakage apertures.