A multiaperture magnetic control device

Although a wide variety of multiaperture devices are known in the field of magnetic logic, applications which use linear ferrite with a small hysteresis instead of square-loop material are very rare. A novel device of the linear type is presented which lends itself to a wide variety of applications. The ferrite is shaped in the form of a figure eight. There are four control legs, each bearing a slot; a separate control winding is wound through each of these slots in such a manner as to saturate the local region of the slot only. The device obtained in this way is an all-magnetic bridge made from a single piece of ferrite. The four slots represent the four basic branches of the bridge. An ac signal is applied simultaneously to both input windings. The signal is applied in such a phase that the two input fluxes tend to cancel each other in the center branch. Therefore, no signal flux will be sensed in the output coil in case the bridge is balanced. If the bridge is unbalanced, some signal from one input will be transmitted to the output. Thus, the device can be used for amplitude control of a high-frequency signal.