Patent ID: 7821374

Claim:
A wideband planar transformer comprising: a. a ferrite material wherein said ferrite material has a closed-loop circuitous shape; and b. a pair of balanced symmetric coupled transmission lines inter-wound about said ferrite material, wherein said pair of balanced symmetric coupled transmission lines comprises a capacitance between each said transmission line and a mutual inductance between each said transmission line, wherein said pair of coupled transmission lines form a pair of balanced symmetric coupled differential lines, wherein said pair of balanced symmetric coupled transmission lines inter-wound about said ferrite material provide a distributed inductance about said ferrite material, wherein trace widths of each said transmission line and gaps between said pair of balanced symmetric coupled transmission lines are matched to provide said differential coupling across a range from DC to multi-GHz, wherein said pair of coupled differential lines have an impedance proportional to a ratio of said distributed inductance over said coupling capacitance, wherein said ratio is disposed to match a differential input impedance and a differential output impedance in said wideband planar transformer, wherein each said transmission line comprises a specific impedance, wherein said specific impedance is dependent on an inductance of each said line and a capacitance of each said line.