APITech S-Band Quad Transmit Receive Module (QTRM)

The API Technologies Dual S-Band 100W T/R Module is designed to operate in active Phased Array Radar systems. It utilises a 40V supply to drive the 100W LDMOS amplifier, which operates in class AB, with local storage capacitance to supply the peak currents for 100us pulse lengths at duty cycles up to 20%. A circulator provides the duplexer function with a T/R switch to protect the receiver from reflected power. The 6 BIT phase shifter and attenuator are positioned in the common arm so are available in transmit and receive. They are controlled with parallel TTL logic derived from a FPGA that is driven by a 3-wire serial data stream.