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 WR340 waveguide, Pmax up to 30 kW | 2450 MHz | WR340 (R26) | 200 mV typ at P=Pmax | D9m |
| BD111B | Temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for WR340 waveguide, Pmax up to 30 kW | 2450 MHz | WR340 (R26) | 7.4 V typ at P=Pmax | D9m |
| BD112 | Standard Schottky diode-based bidirectional detector for WR340 waveguide, Pmax up to 30 kW | 2450 MHz | WR340 (R26) | 200 mV typ at P=Pmax | D9m |
| BD112B | Standard Schottky diode-based bidirectional detector with DC amplifiers, for WR340 waveguide, Pmax up to 30 kW | 2450 MHz | WR340 (R26) | 7.4 V typ at P=Pmax | D9m |
| BD131 | Fast, temperature-stable, tunnel diode-based bidirectional detector for WR430 waveguide, Pmax up to 30 kW | 2450 MHz | WR430 (R22) | 200 mV typ at P=Pmax | D9m |
| BD131B | Temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for WR430 waveguide, Pmax up to 30 kW | 2450 MHz | WR430 (R22) | 7.4 V typ at P=Pmax | D9m |
| BD132 | Standard Schottky diode-based bidirectional detector for WR430 waveguide, Pmax up to 30 kW | 2450 MHz | WR430 (R22) | 200 mV at P=Pmax | D9m |
| BD132B | Standard Schottky diode-based bidirectional detector with DC amplifiers, for WR430 waveguide, Pmax up to 30 kW | 2450 MHz | WR430 (R22) | 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 WR975 waveguide, 10 kW/100 kW | 900 MHz | WR975 (R9) | 130 mV at P=10 kW/100 kW | D9m |
| BD211B | Temperature-stable, tunnel diode-based bidirectional detector with DC amplifiers, for WR975 waveguide, 10 kW/100 kW | 900 MHz | WR975 (R9) | 4.1V typ at P=10 kW/100 kW | D9m |
| BD214 | Standard Schottky diode-based bidirectional detector for WR975 waveguide, 10 kW/100 kW | 900 MHz | WR975 (R9) | 190 mV at P=10 kW/100 kW | D9m |
| BD214B | Standard Schottky diode-based bidirectional detector with DC amplifiers, for WR975 waveguide, 10 kW/100 kW | 900 MHz | WR975 (R9) | 8.2 V typ at P=10 kW/100 kW | D9m |