Patent ID: 6518850
Filing Date: 2003-02-11
Classification: H01Q,H03C

Abstract:
A method for a direct modulation of a microwave carrier from a fast digital bit-stream, comprising the steps of:generating a microwave carrier having a desired power level at a desired operating frequency; applying the generated microwave power to a radiator device; applying said microwave carrier from said radiator device to an input side of a ferroelectric element to be applied as a modulating device by inserting said ferroelectric element close in front of said radiator device; operating said ferroelectric element by means of a variable voltage source, said variable voltage source being controlled by said fast digital bit-stream representing the information to be modulated, said variable voltage source thereby generating an alternating voltage level representing said digital bit stream; outputting a resulting phase modulated microwave carrier signal from said ferroelectric element to radiate a microwave provided with phase modulated information; controlling said alternating voltage level according to a requested phase modulation of said microwave carrier passing ferroelectric element for obtaining a desired modulation phase deviation of the microwave carrier transmitted; combining said ferroelectric element with a ferroelectric lens arrangement for further controlling direction of a radiated microwave.