NxM TERAHERTZ DETECTOR ARRAY IMAGING SYSTEM BASED ON MULTI-FREQUENCY ANTENNA STRUCTURE

An N×M terahertz detector array imaging system based on a multi-frequency antenna structure, comprising an N×M detector array, a detector and readout circuit test switch, and a readout circuit;

• wherein the N×M detector array comprises N×M detector units arranged in rows and columns, N row selection switches, and M column selection switches;
• and
• each detector unit comprises a multi-frequency-point terahertz antenna, a matching network comprising transmission lines TL1, TL2, and TL3, a DC blocking capacitor C1, a bias voltage Vb1, a bias resistor Rb1, a Schottky diode SBD, and an NMOSFET;
• and
• wherein the multi-frequency-point terahertz antenna is connected to a left port of the transmission line TL1, a right port of the transmission line TL2 is connected to an anode of the Schottky diode SBD, and a cathode of the Schottky diode SBD is connected to ground;
• the bias resistor Rb1 is connected between the anode of the Schottky diode SBD and the bias voltage Vb1, and is used to supply power to the Schottky diode SBD;
• the transmission line TL3 of the matching network is separately connected to one end of the DC blocking capacitor C1 and an MSEL terminal of the NMOSFET, and the other end of the DC blocking capacitor C1 is grounded;
• an SEL terminal of the NMOSFET in each detector unit is connected to a column selection switch of a column where it is located;
• a Vout terminal of the NMOSFET in each detector unit is connected to a row selection switch of a row where it is located;
• and
• the detector and readout circuit test switch is connected between the N row selection switches and the readout circuit.