| 摘要 |
Microstructure materials which can be tuned to a particular range of r.f. frequencies to display particular magnetic permeabilities have been proposed. A typical material is made of an array of capacitive elements e.g. spirals or rolls of conducting material on a non-conducting substrate. These materials can be used as a guide which is effective for the particular band of frequencies to which it is tuned. In one example, the rolls ( 2 a to 2 c) guide magnetic flux along ducts ( 1, 2, 3 ) while rolls ( 4 a, 5 a) guide magnetic flux along ducts ( 4, 5 ). Flux can thus be guided upwardly along duct ( 2 ), along ducts ( 4 and 5 ), and down ducts ( 1, 3 ), or vice versa. |
