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Equipment Solutions: Phase Shift Network

Phase shift networks consist of passive reactive components inserted between a transmitter and antenna tuner. They are used to provide impedance matching, to suppress out-of-band harmonics, and to manage the symmetry of the load impedance presented to the power amplifiers at the Mark and Space shift frequencies.

Phase shift networks are critical elements in narrow-band frequency-shift keyed LF and VLF communication transmitters. They are typically configured as low-pass filters that can perform impedance transformation while suppressing harmonics, and are precisely tuned to insert a specified phase delay. The phase of the signal must be managed to compensate for delays introduced by the transmitter, the transmission line, and the antenna matching circuit in order to equalize the power transmitted at the Mark and Space shift frequencies.

Hi-Q engineers are highly qualified to engineer the best architecture for matching power amplifiers to antennas and creating optimally designed phase-shift network(s). We have decades of experience providing:

  • Analysis and characterization of networks and components
  • Determination of optimum network architectures for multi-frequency/multi-impedance matching
  • Electrical and mechanical design of components
  • Fabrication of complete networks
  • Installation, checkout, and commissioning
  • Documentation

Our designs include conservative voltage and current stress management, motor drives suitable for closed-loop auto-tuning, and protection from transient over-voltage conditions.

 

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