Lance E Wilson

US Patent:

49453190, Jul 31, 1990

Filed:

Jul 28, 1989

Appl. No.:

7/387317

Inventors:

Lance G. Wilson - North Hollywood CA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03H 738

US Classification:

333 33

Abstract:

An improved physical implementation of a high frequency impedance transformer circuit formed from three coaxial transmission line segments is described. In a preferred embodiment, each transmission line segment is in the form of a one and a half turn coil wrapped around a ferrite core. The ends of the coaxial transmission line segments extend through holes in a small PC board and planar conductors thereon. The ends of the transmission line shields are circumferentially soldered to some planar conductors on the board and the center conductors of the coaxial line segments are soldered to adjacent planar conductors on the board in such a way as to provide the desired circuit in a very compact and rugged arrangement.