Ferroelectric modulator

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;
• a variable voltage source controlled by a digital bit-stream, said variable voltage source controlling dielectric properties of said ferroelectric element for applying phase modulation to a radiated microwave carrier passing said ferroelectric element.

An arrangement for direct modulation of a microwave by an information signal, comprising:

• a microwave generator delivering a desired microwave carrier power level;
• a microwave radiating device for radiating the power level generated by said microwave generator;
• a ferroelectric element positioned close in front of said microwave radiating device;
• a variable voltage source controlled by a digital bit-stream, said variable voltage source controlling dielectric properties of said ferroelectric element for applying phase modulation to a radiated microwave carrier passing said ferroelectric element;
• wherein said ferroelectric element in front of said radiating device further is combined with a ferroelectric lens controlling a radiation lobe of said microwave radiating device.