X-ray tube transformer

An x-ray generator comprising:

• a transmission line transformer including:
• a first electrical conductor having a cavity therein;
• a second electrical conductor including helical windings disposed along a longitudinal axis within the cavity in said first electrical conductor, said helical windings having a pitch which varies per unit length along said longitudinal axis;
• a dielectric material disposed within the cavity in said first electrical conductor and between said first and second electrical conductors for electrically insulating said first electrical conductor from said second electrical conductor and electro-magnetically coupling said first and second electrical conductors in response to an electric current folowing through said conductors;
• said first and second electrical conductors having an impedance between them which varies as a function of distance along a longitudinal axis of the helix of said second electrical conductor;
• said second electrical conductor having an input terminal connected to receive an applied input signal and an output terminal for producing an output signal;
• and
• an x-ray tube disposed along the longitudinal axis within the cavity having an input coupled to said first electrical conductor and having another input coupled to the output terminal of said second electrical conductor for radiating x-rays.