Harmonic Injection Doubles Ultra–Wideband TWT RF Output

By Dave Pfaff, Senior Engineer, dB Control

Wideband traveling wave tubes (TWTs) can fall short of an application’s power requirements due to low gain and low RF output power at the lowest frequencies. For example, an ultra-wideband TWT may have 60 dB gain at its mid-band frequencies, but only 10-20 dB at the low end. Fortunately, harmonic injection can be used to produce a new generation of ultra-wideband microwave power modules (MPMs) with twice the low-end RF output power of standalone ultra-wideband TWTs.

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