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29 March 2024
 
  » arxiv » 0802.1343

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Impedance-matched low-pass stripline filters
D. F. Santavicca ; D. E. Prober ;
Date 10 Feb 2008
AbstractWe have constructed several impedance-matched low-pass filters using a stripline geometry with a dissipative dielectric. The filters are compact, simple to construct, and operate in cryogenic environments. The dissipative dielectric consists of magnetically-loaded silicone, which is commercially available in several varieties under the trade name Eccosorb. For a stripline length of 32 mm, the filters have a passband that extends from dc to a 3 dB bandwidth between 0.3 and 0.8 GHz. The 3 dB bandwidth can be adjusted beyond this range by changing the length. An extremely broad stopband at higher frequencies, with attenuation exceeding 100 dB, is achieved along with a return loss greater than 10 dB measured up to 40 GHz. This combination of high attenuation and low reflected power across a broad stopband ensures that spurious or unwanted signals outside the passband do not reach or return to the device. This type of filter has applications in microwave frequency measurements of sensitive non-linear devices such as heterodyne mixers, quantum tunneling devices, and quantum computing elements.
Source arXiv, 0802.1343
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