Patent ID: 6232843
Filing Date: 2001-05-15
Classification: H04L

Abstract:
A signal generator for producing a plurality of signals having the same frequency but a constant phase difference suitable for use in a quadrature phase shift keying transmitter, said generator comprising:first and second oscillators, each comprising a cavity having an axially positioned signal source and respective first and second outer cylinder walls, each wall having an aperture therein;a coupling aperture connected between the wall aperture in said first and second oscillators;a first output signal being extracted from said first oscillator at a first predefined location on the first outer wall, the first predefined location defining a first angle relative to the wall aperture in said first oscillator;a second output signal being extracted from said second oscillator at a second predefined location on the second outer wall, the second predefined location defining a second angle relative to the wall aperture in said first oscillator;wherein the phase difference between said first and second output signals is dependent on the difference between said first and second angles.