Patent ID: 8981794
Filing Date: 2015-03-17
Classification: G01K,G01R,G01V

Abstract:
1. A Dicke-switched radiometer comprising: a signal channel comprising of an antenna for receiving an input signal and a first stage amplification circuit for amplifying an output of the antenna and generating an amplified input signal; a reference channel comprising of a resistive load, a second stage amplification circuit for amplifying an output of the resistive load and generating an amplified reference signal, and a matching filter coupled to an output of the second stage amplification circuit for matching a frequency and an impedance of the amplified input signal to a frequency and an impedance of the amplified reference signal; a Dicke switch coupled to first stage amplification circuit and the matching filter for inputting the amplified input signal and an output of the matching filter and switching between the amplified input signal and the output of the matching filter to generate a difference signal; a third stage amplification circuit coupled to an output of the Dicke switch for amplifying the difference signal; and a detector coupled to an output of the third stage amplification circuit to obtain the amplified difference signal and generate a detected difference signal.