Accession Number : AD0640824

Title :   FERRITES AS DISSIPATIVE RF ATTENUATORS.

Descriptive Note : Technical memo.,

Corporate Author : NAVAL WEAPONS LAB DAHLGREN VA

Personal Author(s) : Francis,Joseph H.

Report Date : SEP 1966

Pagination or Media Count : 35

Abstract : Principal-wave transmission line theory is used to investigate the feasibility of utilizing ferrites as dissipative radio frequency attenuators to reduce hazards of electromagnetic radiation to ordnance (HERO). The general characteristics of ferrites and their effect on the performance of a ferrite power attenuator are discussed. Two experimental ferrite-filled transmission-line filters are described; neither device provides the desired power attenuation over the 100 kilocycle per second to one megacycle per second frequency range. A description of two experimental ferrite attenuators which utilize the increased rf resistance of a wire-wound ferrite toroid is given; both devices provide satisfactory power attenuator constructed of miniature solid-tantalum electrolytic capacitors and wire-wound ferrite toroids; the power attenuation of this device exceeds the attenuation objective of 40 db at 100 kilocycles per second and 60 db at one megacycle per second. Although a miniature all-ferrite dissipative filter with the required attenuation can be constructed, a filter composed of solid-tantalum feed-through capacitors and either ferrites or magnetic conductors is considered to be superior. (Author)

Descriptors :   (*FERROMAGNETIC MATERIALS, ATTENUATORS), TRANSMISSION LINES, ELECTROMAGNETIC WAVE FILTERS, HAZARDS, ORDNANCE, RADIOFREQUENCY INTERFERENCE, ATTENUATION, FEASIBILITY STUDIES

Subject Categories : Electrical and Electronic Equipment
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE