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US 4,785,273 AGranted
Strip-line-core transformer
OwnerDavid F. Dotyinventor
Life of this patent
Estimating the term…
Abstract
A broadband, high power rf transformer is made by winding a tapered strip-line transmission-line conductor and dielectric material through two parallel slots, formed axially and symmetrically spaced apart, through a solid right cylinder of low loss magnetic material. Low inductance strip lines are used as leads. A thin sheet of high thermal conductivity material may be added in such a way as to augment heat flow with negligible degradation of rf properties. The design is particularly advantageous at frequencies from 1 MHz to 1000 MHz at pulse powers to several kilowatts at impedances from 2.OMEGA. to 75.OMEGA..
Claims8
A wideband r.f. transformer comprising:
- a strip line core (SLC) made essentially from a carbonyl iron powder composite material, said core being defined by two substantially parallel plane surfaces and having two symmetrically spaced apart slots extending between said surfaces and substantially centered thereon;
- said slots being spaced apart less than 2 cm and positioned so as to form opposite sides of a substantially void free coil-core-region of substantially square cross section in a plane parallel to said plane surfaces;
- and
- a spiral winding of a strip line, consisting of conductor foil and spacer dielectric, threaded through said slots and round said coil-core-region;
- said slots being positioned on said surfaces so that the cross sectional area presented to magnetic flux generated by said spiral winding by the coil-core-region is less than 80% of the mean total cross sectional area presented to the flux by the material outside of said coil-core-region.
2 more elements
Dependencies are inferred from the claim text.