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Impedance-matched low-pass stripline filters | D. F. Santavicca
; D. E. Prober
; | Date: |
10 Feb 2008 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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