微波過濾熱化器
微波過濾熱化器
微波過濾熱化器
微波過濾熱化器

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

Resistive for optimum thermalization

Ultra-low (mΩ) resistance forhigh-currents

Connector type

SMA, MCX, or customized

Dimensions (not including connector)

Length~25mm, Diameter~6mm

Capacitance

300K/4.2K

2.5nF

12nF

2.5nF

12nF

In-line resistance

T=300K

100Ω

2.5Ω

T=4.2K

100Ω

25mΩ

Attenuation

3dB cutoff*

~1.3MHz**

~0.2MHz**

~2MHz

~0.5MHz

20dB cutoff*

~10MHz**

~1.2MHz**

~20MHz

~3MHz

100dB cutoff*

~180MHz

~45MHz

~200MHz

~70MHz

Maximum applied voltage

100V

Maximum applied current

300K

10mA

30mA

10mK

0.2mA***

10mA***

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

Filter type

MFT-100Ω

MFT-25mΩ

Connector type

Micro-D connector

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/