S-Band Quad Transmit Receive Module (QTRM) from API Technologies

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The Dual S-Band 100W T/R Module utilizes 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.

Features and Specifications:
  • 6 BIT phase and attenuation control
  • Independent control of each channel
  • Integral power supply sequencing and conditioning
  • Integral digital control and messaging logic


  • Minimum 100W Output Power per channel using high efficiency LDMOS transistors
  • Low receiver noise figure <3.3dB @ 55°C
  • Up to 100μs Pulse Width, 20% Dty Cycle
  • Large Internal Storage Capacitance for Optimum Pulse Shape
  • European Manufacturer
Applications Include:
  • Naval Radar / Marine Radar
  • Airborne Radar
  • Ground-based Radar
  • Vehicle-mounted Radar
  • Air Traffic Control Radar
  • Tactical Data Links including SATCOM on the MOVE
  • E-Scan & Satcom Applications