微波過濾熱化器
專為毫開爾文與次毫開爾文實驗設計(mili-Kelvin and sub-mili-Kelvin)
微波濾波與訊號線熱化是搭建高靈敏度低溫實驗的兩個關鍵要素。我們的緊湊型低溫微波濾波與熱化裝置 (MFT) 結合了高效的電子熱化能力與超強的微波衰減性能。
MFT 由銅或其他低電阻率導線組成,嵌入高導電性的銀基質中。銀基質作為熱交換器,確保最佳熱化效果。
單個 MFT 濾波器的卓越性能已在一項實驗中得到證實。該實驗使用稀釋制冷機將庫侖阻塞溫度計冷卻至 7.5 mK,而制冷機的溫度為 5 mK。
高衰減、低截止頻率、強熱化能力
● 在緊湊型非磁性盒內提供 25 條濾波線
● 可輕鬆安裝於 10 mK
● 指數級強衰減,無共振現象(下一頁附有圖表)
● 在 ~100 MHz 以上具有超過 100 dB 的衰減
● 強熱化能力(濾波導線嵌入銀膠中)
● 超低電阻,適用於高電流應用:~25 mΩ @ 4K
● 超低電容,降低電流測量中的噪聲:2.5 nF
● 接地電阻 > 1 TΩ;洩漏電流可忽略不計
● NEW: 2 極 RCRC 階段選項,3 dB 截止頻率低至 kHz,整合於同一裝置內
Single Filter Models |
MFT-100Ω |
πMFT-100Ω |
MFT-25mΩ |
πMFT-25mΩ |
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Resistive for optimum thermalization |
Ultra-low (mΩ) resistance forhigh-currents |
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Connector type |
SMA, MCX, or customized |
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Dimensions (not including connector) |
Length~25mm, Diameter~6mm |
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Capacitance |
300K/4.2K |
≲2.5nF |
≲12nF |
≲2.5nF |
≲12nF |
In-line resistance |
T=300K |
≲100Ω |
≲2.5Ω |
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T=4.2K |
≲100Ω |
≲25mΩ |
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Attenuation |
3dB cutoff* |
~1.3MHz** |
~0.2MHz** |
~2MHz |
~0.5MHz |
20dB cutoff* |
~10MHz** |
~1.2MHz** |
~20MHz |
~3MHz |
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100dB cutoff* |
~180MHz |
~45MHz |
~200MHz |
~70MHz |
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Maximum applied voltage |
100V |
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Maximum applied current |
300K |
10mA |
30mA |
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10mK |
0.2mA*** |
10mA*** |
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Resistance to ground |
>1TΩ |
Table shows typical specs; *Variations of up to ±20% in cutoff frequencies can be expected; **Extracted from measurements with 1MΩ input impedance; all other cutoff frequencies are extracted with 50Ω input impedance (typical spectra plotted below); ***Maximum current at 10mK is calculated to keep dissipation below 10µW.
25-line Filter Box Models |
MFT25-100Ω |
MFT25-25mΩ |
Number of filtered lines |
25 |
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Filter type |
MFT-100Ω |
MFT-25mΩ |
Connector type |
Micro-D connector |
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Weight and dimensions |
400g, 30 x 56 x 68mm (withoutMicro-D) For mounting: 4x M4 with 39.5 to 44mm flexible & 60mm fixed spacing |
Figure shows typical room-temperature attenuation characteristics of individual MFT filters. A vector network analyzer with 50Ω input was used. For 100Ω filters (red curves), a spectrum analyzer with 1MΩ input impedance was used below 20 MHz. Disclaimer: measurement results depend on the total setup and load impedance (real and imaginary). The jump observed (yellow circles) is caused by switching the input impedance from1MΩ to 50Ω.
KHz截止頻率搭配 2 極 RCRC 階段
- 整合於同一款緊湊型 MFT25 裝置內
- 標準截止頻率選項範圍:1 至 35 kHz
- 可根據應用需求定制 R 和 C 以調整截止頻率
- 詳情請來信詢問
纖薄型低溫微波濾波器與熱化裝置 (SlimMFT)
- 適用於小型(50 mm)稀釋制冷機之插入裝置的纖薄 MFT 套件
- 銀膠基底的超低電阻、超低電容微波濾波器與熱化裝置(MFT)
- 一個 SlimMFT8 套件包含 8 條濾波線(左上圖)
- 多個套件可堆疊安裝(右上圖)
- 最多可容納 6 個套件(48 條濾波線)於 50 mm 插入裝置內
- 單個 SlimMFT8 套件尺寸:約 52 x 21 x 3.2 mm
- 採用 SIP 插座連接器,便於插拔
- 可輕鬆安裝於cold finger
https://www.baspi.ch/