|Sinclair offers a complete
range of high-Q cavity filters to provide bandpass, notch (reject) and Q-circuit (bandpass
reject) responses. The basic cavity filter is constructed of a 7-inch or 10-inch diameter
aluminum cylinder with a coaxial inner conductor of brass and copper.
Silver plating and chromate conversion coatings are used to inhibit corrosion and enhance performance. Temperature compensation is achieved through the use of an invar tuning rod, which results in extremely low frequency drift over the operating temperature range, typically 0.5 ppm/�C. Filter cavities may be cascaded using quarter wavelength or three-quarter wavelength interconnecting cables for greater selectivity (bandpass) or notch rejection (reject and Q-circuit).
The insertion loss of the cascaded filter is the sum of the individual insertion losses plus an allowance of approximately O.I dB for each interconnecting cable.
For individual cavity skirt selectivities of 10 dB or more, the cascaded filter selectivity is the sum of the individual cavity selectivities plus a mismatch loss which is approximately 5 dB for each added cavity.
WISCO International, Inc. -
MIAMI, FL U.S.A.
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