Patent ID: 6060962
Filing Date: 2000-05-09
Classification: H01P

Abstract:
An analog phase modulator operable for linearly phase modulating an input signal in relation to an applied bias signal, said analog phase modulator comprising:a quadrature signal coupler having an input port for receiving an input signal,an output port for providing an output signal derived from said input signal,an in-phase terminating port,a quadrature phase-shifted terminating port, andan electrical ground;first and second variable reactance networks where each of said first and second variable reactance networks includes,first and second electrical node terminating means,a first transmission line segment having a first transmission line terminating end means coupled to said first electrical node terminating means through a series connected capacitance, and having a second transmission line terminating end means,a second transmission line segment having a first transmission line terminating end means electrically connected to said second terminating end means of said first transmission line segment, and having a second transmission line terminating end means electrically connected to said second electrical node terminating means,a first variable reactance means for providing a variable reactance which varies in relation to said applied bias signal, said variable reactance having a first reactance terminating means electrically connected to said first terminating end means of said second transmission line segment and a second reactance terminating means coupled to said electrical ground, anda second variable reactance means for providing a variable reactance which varies in relation to said applied bias signal, said variable reactance having a first reactance terminating means electrically connected to said second terminating end means of said second transmission line segment, and a second reactance terminating means coupled to said electrical ground;means for electrically connecting said first electrical node terminating means of said first variable reactance network directly to said in-phase terminating port;means for electrically connecting said first electrical node terminating means of said second variable reactance network directly to said phase-shifted terminating port; anda bias input port means for receiving said applied bias signal, said bias input port means electrically connected to said second electrical node terminating means of said first variable reactance network, and to said second electrical node terminating means of said second variable reactance network.