BD211B: Temperature-Stable Bidirectional Detector for R9 Waveguide, with DC Amplifiers
BD211B is a bidirectional detector intended for simultaneous sampling of incident and reflected waves in high-power 900 MHz industrial applications using an R9 (WR975) rectangular waveguide. The bidirectional detector combines the following components:
- 4-port directional coupler
- Tunnel diode detectors
- Low noise operational amplifiers
The unit delivers two DC voltages in the range 0 to approximately 9 V. The voltages are functions of the powers associated with waves propagating in opposite directions in the parent waveguide.
The use of tunnel diodes provides the bidirectional detector with improved temperature stability.