Accession Number : AD0434051


Title :   MINIATURE THIN FILM INDUCTORS (MODIFICATION NO. 2).


Descriptive Note : Interim rept. no. 3, 1 Dec 63-1 Mar 64,


Corporate Author : MOTOROLA INC PHOENIX ARIZ


Personal Author(s) : Gleason,F R


Report Date : 01 Mar 1964


Pagination or Media Count : 14


Abstract : A program is described for fabricating miniature thin-film inductors. These inductors use flat spiral conducting paths on bulk ferrite substrates encapsulated with depositied ferrite film. The period covered from 1 December 1963 to 1 March 1964. Four tasks, all directed toward the problem of obtaining larger inductance values, have been pursued during this period. They are: (1) Study the effect of ferrite material thickness on the inductance of an encapsulated coil; it was determined that a 40-mil (1000 micron) thick layer of material is required for maximum permeability effect. (2) Fabricate spiral coils of increased air core inductance: The 1.8 microhenry 23-turn coil has not been completed. (3) Fabricate spiral coils of a gold-rhodium alloy so that a ferrite film deposited encapsulating these coils can be annealed or sintered at elevated temperatures, i.e., greater than 1050 C. (4) Study techniques for fabricating two coils in a mutually aiding inductive geometry on a single substrate. The coils are separated by a ferrite film deposit: Absorption of the gold plating solution by the ferrite has been a problem. This prevented the fabrication of a complete unit for evaluation. (Author)


Descriptors :   *COILS , FERRITES , FILMS , THICKNESS , ENCAPSULATION , INDUCTANCE , TEMPERATURE , VAPOR PLATING , ELECTROPLATING , GOLD , PERMEABILITY(MAGNETIC) , GOLD ALLOYS , RHODIUM ALLOYS


Distribution Statement : APPROVED FOR PUBLIC RELEASE