PCB etched inductance module with spiral form inductance - positioned on top squared board section with trapezoidal taper lower part to drop into PCB slot for main board solder connection

摘要

An inductance on a substrate module has a trapezoidal base to simplify installation and connection to printed circuit boards. The inductance is a copper spiral etched so that it fills the top squared part of the substrate. A central hole in this part of the substrate is used to connect one end of the inductance through to a copper connecting track on the reverse side of the substrate. The outer end of the spiral is connected directly, and preserved so during etching, to a copper strip which forms the other connection to the inductance. Both copper strips extend down from the squared part of the substrate to the trapezoidal part so that this part enables the inductance to sit above the board and the terminal strips from the inductance to extend below the board for connection to the PCB track using soldering techniques. A meandering form of inductance track may be used on the substrate instead of the spiral form. The dielectric constant of the substrate is greater than 100 and its dimensions are 0.5 to 1.5 mm thick by 4 to 8 wide and 5 to 15mm high.