Low cost, high efficiency radio frequency transformer

TLDR: In this paper, a simple U-shaped transformer is constructed from a single unitary tubular member arranged into a U-shape configuration with a pair of spaced sets of openings therein for the purpose of allowing efficient threading of a secondary winding.

Abstract: Especially simple structure for an electrical transformer device provides cost effective fabrication thereof and offers improved operating performance particularly in a radio transmitter circuit for coupling high levels of radio frequency energy from the output of a radio frequency amplifier to an antenna system. One winding of the transformer is formed from a single, unitary, tubular member arranged into a U-shaped configuration which includes a pair of spaced sets of openings therein for the two-fold purpose of allowing efficient threading of a secondary winding therewithin and to improve air cooling characteristics of the device. A second winding comprises a wire passed through the interior of the tubular member, and a number of cylindrically shaped magnetic elements are sleeved over the tubular member to enhance the mutual inductive coupling between the windings. A circuit board having a cut-out zone therethrough is especially adapted to have the transformer device mounted thereon in an essentially flat position juxtaposed over the cut-out zone to provide maximum convection and conduction cooling of the transformer and thereby significantly increase the power handling capabilities of the device.