Cryo Low Temp Coaxial Attenuators
Spectrum Control designs ultra-low VSWR (1.1:1) cryogenic coaxial attenuators that deliver best-in-class VSWR performance. These ultra-low VSWR, superior-flatness attenuators provide continuous, reliable operation at temperatures approaching absolute zero. Engineered to minimize self-heating, which can introduce additional thermal noise. Spectrum Control’s cryogenic attenuators support frequency operation up to 40 GHz.
Most attenuators operating at low temperatures can effectively become shorts, eliminating their critical function of properly attenuating and protecting the waveform. Spectrum Control’s low-VSWR cryogenic attenuators remain stable down to 4 mK, a temperature at which many competing low-temperature attenuators cannot operate reliably. Using a proprietary thin-film resistor material, Spectrum Control design engineers developed coaxial attenuators capable of consistent performance at 4 mK.
Spectrum Control cryogenic attenuators offer exceptional low VSWR approaching 1.15:1, with attenuation values up to 30 dB in a 50-ohm impedance system.
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Effective thermalization is essential for achieving near-absolute-zero temperatures. Spectrum Control attenuators provide a controlled thermal path that directs resistive heat to the cold plate rather than through the coaxial line, preventing unwanted thermal interference with sensitive components such as processors.
Constructed with gold-plated beryllium copper conductors and a beryllium oxide substrate, Spectrum Control cryogenic attenuators accommodate thermal contraction and expansion without losing electrical contact or introducing microphonic effects and excess thermal noise that could degrade performance.
