2nd generation

HERD-2

High-Energy Radiation Drain

Non-magnetic inline filter with ultra-low in-band loss and a stopband from 70 GHz upward, measured to 145 GHz, reducing quasiparticle generation at the cold stage.

HERD-2 datasheet (PDF)
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HERD-2 IR-blocking filter

Product specifications

Datasheet

Electrical

Design impedance50 Ω
Operating temperature0 K–320 K
PassbandDC–13.5 GHz
RF input power≤ 30 dBm
Stopband70–145 GHz min.
Insertion loss (passband)<0.15 dB typ.
Return loss (passband)>20 dB typ.
Return loss (>20 GHz)>7 dB typ.
RF connectorsSMA / SMP / SMPM / SMPS

Mechanical

Length62.96 mm
Width9.53 mm
ConstructionNon-magnetic

Custom configurations: Various connector options are available. Reach out with what you need.

Measured performance

HERD-2 transmission response, 0 to 140 GHz
Fig. 1 · Wide-band0–140 GHz

Flat in-band response with high-frequency absorption above 65 GHz. VNA noise floor shown for reference.

HERD-2 in-band transmission response, 0 to 14 GHz
Fig. 2 · In-band detail0–14 GHz

Insertion loss <0.15 dB typical from DC to 8 GHz, with minimal variation.

HERD-2 return loss (S11) response, 0 to 14 GHz
Fig. 3 · Return lossS₁₁ · 0–14 GHz

Return loss is specified as better than 20 dB typical across the passband.

Non-magnetic by design

HERD-2 is built entirely from non-magnetic materials, so it adds no stray fields to the cold stage. That makes it safe to mount close to the device for both flux-sensitive superconducting qubits and magnetically sensitive spin qubits.

Lines
Readout · charge · flux
Qubit platforms
Superconducting · spin

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Pricing, lead times, and connector configurations (SMA / SMP / SMPM / SMPS) for your cryostat. Tell us your system and we will spec it.

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