Multi-channel radiometer imaging system
View Patent ↗A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs. A detection circuit receives and detects the signal from the switch forming a detected signal. A controller board is carried by the housing and an integration circuit and processor receive the detected signal and produces a digital output.
1. A MMIC comprising:
a hybrid and amplifier circuit that is adapted to receive an unknown signal and known reference signal and comprising a first quadrature hybrid as an input having at least one radio frequency (RF) input and parallel signal path outputs;
at least one amplifier connected to each signal path output of the first quadrature hybrid;
a second quadrature hybrid connected to the at least one amplifier at each signal path and having parallel RF outputs, wherein the amplifiers provide equalized amplifier gain;
a switch positioned after the dual channel quadrature hybrid network and operatively connected to the parallel RF outputs of the second quadrature hybrid for selecting one of the RF outputs and providing a single RF output; and
a detector operatively connected to the switch for detecting the single RF output from the switch.
2. A MMIC according to claim 1 , wherein said switch comprises a non-reflective switch.
3. A MMIC according to claim 1 , wherein said switch is operative for minimizing any amplifier noise.
4. A MMIC according to claim 1 , wherein said detector comprises a diode.
5. A MMIC according to claim 1 , wherein said detector is ground connected.
6. A MMIC according to claim 1 , and further comprising dual RF inputs and RF outputs.