Multi-layer radio frequency transformer

A radio communication device, comprising:

• an antenna;
• a transmitter for transmitting a radio frequency signal and including an amplifier, the amplifier including a transformer for coupling an amplified signal to the antenna, the transformer having an insertion loss and comprising:
• a first substantially flat dielectric substrate having a top and a bottom surface;
• a first runner disposed on the top surface of the dielectric substrate to form two spirals collectively having an S-type arrangement, the first runner includes first and second ends;
• a second runner disposed on the bottom surface of the dielectric substrate to form two spirals collectively having an S-shape arrangement and being inductively coupled to the first runner, the second runner includes first and second ends;
• a second substantially first dielectric substrate, including:
• a top surface attached to the bottom surface of the first substrate sandwiching the second runner therein;
• a bottom surface plated with a layer of conductive material to provide a ground plane thereon;
• an input terminal coupled to the first and second ends of the first runner;
• and
• an output terminal coupled to the first and second ends of the second runner.

An electrical device, comprising:

• a multi-layer RF balun transformer, comprising:
• a first substantially fiat dielectric substrate having a top and a bottom surface;
• a first runner disposed on the top surface of the dielectric substrate to form two spirals collectively having an S-shape arrangement, the first runner includes first and second ends;
• a second runner disposed on the bottom surface of the dielectric substrate to form two spirals collectively having an S-shape arrangement and being inductively coupled to the first runner, the second runner includes first and second ends;
• a second substantially fiat dielectric substrate, including:
• a top surface attached to the bottom surface of the first substrate sandwiching the second runner therein;
• a bottom surface plated with a layer of conductive material to provide a ground plane thereon;
• a third substantially fiat dielectric substrate, including:
• a top surface plated with a layer of conductive material to provide a ground plane thereon;
• a bottom surface attached to the top surface of the first substrate sandwiching the first runner therein
• a fourth substantially fiat dielectric substrate attached to the plated top surface of the third substrate;
• a circuit pattern located on the fourth substrate for accommodating electrical components.
• an input terminal coupled to the first and second ends of the first runner;
• and
• an output terminal coupled to the first and second ends of the second runner.