Inductive device for an electromagnetic delay line and method for fabricating the same

An electromagnetic delay line, comprising:

• a lead frame including a common electrode plate, an input electrode plate, and an output electrode plate;
• a composite capacitor having a common electrode on one side thereof and a plurality of capacitive electrodes arranged in a row on the other side of said composite capacitor, said common electrode being placed over and securely attached to said common electrode plate with said capacitive electrode facing away from said lead frame;
• and
• an inductive device including a bobbin having a certain length, a main coil of electroconductive wire would around said bobbin, an extra coil provided adjacent each longitudinal end of said main coil as a continuous extension of said main coil, intermediate taps each formed of a twisted, doubled length of said electroconductive wire extending laterally from an intermediate part of said main coil, and terminal taps each formed by a twisted, doubled, length of a part of said coil wire situated between said main coil and said extra coil;
• said terminal taps being connected to said input and output electrode plates of said lead frame, respectively, and said intermediate taps being connected to said capacitive electrodes.

A method of fabricating an inductive device for an electromagnetic delay line, comprising the steps of;

• winding a main coil of electroconductive wire around an elongated bobbin along a length thereof;
• winding at least one extra coil adjacent a longitudinal end of said main coil as a continuous extension of said main coil;
• forming at least one intermediate tap after winding each section of said coil by extending a length of said coil wire laterally away from said coil, bending a remaining portion of said length of said coil wire toward said coil, and twisting the thus formed wire pair with each other;
• and
• forming a terminal tap by extending a length of a part of said coil wire situated between said main coil and said extra coil laterally away from said extra coil, bending a remaining portion toward said extra coil, and twisting the thus formed wire pair with each other in the same direction in which the wire pair forming the intermediate tap was twisted.