Bidirectional Detectors

A bidirectional detector (BD) is a component combining:

  • Dual directional coupler; its output ports sample waves travelling in opposite directions in the main waveguide or coaxial transmission line.
  • Detector in each of the coupler output ports.
  • Optionally a DC amplifier in each of the coupler output ports.

As a result, a bidirectional detector provides two DC output voltages: one ideally proportional to forward (incident) power, the other ideally proportional to reverse (reflected) power. However, the transfer curves (voltage-power dependencies) are generally nonlinear and more or less vary with temperature.

Applications

Bidirectional detectors can serve for simultaneous sampling of incident and reflected powers, the difference of which yields the net power delivered to, and hence dissipated in load.

The devices can be fixed to a parent waveguide with screws after machining of appropriate holes in the broad waveguide wall. A precision parent waveguide can optionally be part of delivery.

Model Description ISM Band Waveguide Type Output Voltage Connector(s)
BD111 Fast, temperature-stable, tunnel diode-based bidirectional detector for R26 waveguide, Pmax up to 30 kW 2450 MHz R26 (WR340) 200 mV typ at P=Pmax D9m
BD111B Fast, temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for R26 waveguide, Pmax up to 30 kW 2450 MHz R26 (WR340) 7.4 V typ at P=Pmax D9m
BD112 Standard Schottky diode-based bidirectional detector for R26 waveguide, Pmax up to 30 kW 2450 MHz R26 (WR340) 200 mV typ at P=Pmax D9m
BD112B Standard Schottky diode-based bidirectional detector with DC amplifiers, for R26 waveguide, Pmax up to 30 kW 2450 MHz R26 (WR340) 7.4 V typ at P=Pmax D9m
BD131 Fast, temperature-stable, tunnel diode-based bidirectional detector for R22 waveguide, Pmax up to 30 kW 2450 MHz R22 (WR430) 200 mV typ at P=Pmax D9m
BD131B Fast, temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for R22 waveguide, Pmax up to 30 kW 2450 MHz R22 (WR430) 7.4 V typ at P=Pmax D9m
BD132 Standard Schottky diode-based bidirectional detector for R22 waveguide, Pmax up to 30 kW 2450 MHz R22 (WR430) 200 mV at P=Pmax D9m
BD132B Standard Schottky diode-based bidirectional detector with DC amplifiers, for R22 waveguide, Pmax up to 30 kW 2450 MHz R22 (WR430) 7.4 V typ at P=Pmax D9m
BD142 Standard Schottky diode-based 7-16 coaxial bidirectional detector, 2 kW 2450 MHz Coax 7-16 300 mV at P=1 kW SMAf
BD211 Fast, temperature-stable, tunnel diode-based bidirectional detector for R9 waveguide, 10 kW/100 kW 900 MHz R9 (WR975) 130 mV at P=10 kW/100 kW SMAf
BD211B Temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for R9 waveguide, 10 kW/100 kW 900 MHz R9 (WR975) 4.1V typ at P=10 kW/100 kW D9m
BD214 Standard Schottky diode-based bidirectional detector for R9 waveguide, 10 kW/100 kW 900 MHz R9 (WR975) 190 mV at P=10 kW/100 kW SMAf
BD214B Standard Schottky diode-based bidirectional detector with DC amplifiers, for R9 waveguide, 10 kW/100 kW 900 MHz R9 (WR975) 8.2 V typ at P=10 kW/100 kW D9m