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A modern Purolator oil filter. The company was founded in 1923 as Motor Improvements, Incorporated in New York City. [1] The company's Purolator (initially stylized PurOlator and sometimes Pur-O-Lator) oil filtration device, [2] invented in 1922 by Ernest John Sweetland [3] and George H. Greenhalgh, [1] was standard equipment on early 1920s Chrysler automobiles after being launched on the ...
Radio frequency (RF) and microwave filters represent a class of electronic filter, designed to operate on signals in the megahertz to gigahertz frequency ranges ( medium frequency to extremely high frequency ). It is component that is used in electronic systems to pass or reject specific frequencies and attenuate of unwanted signals within the ...
Pur (styled PŪR; pronounced as "pure") is a division of Helen of Troy Limited that produces Pur Water products. Pur's products include water filter faucet mounts, pitchers, side taps, dispensers, coolers, and filtration systems for Kenmore refrigerators of Sears Holdings Corporation .
YIG filters are used for their high Q factors, typically between 100 and 200. [1] [2] A sphere made from a single crystal of synthetic yttrium iron garnet acts as a resonator. The field from an electromagnet changes the resonance frequency of the sphere and hence the frequency it will allow to pass.
Microfabrication. [edit] An RF MEMS fabrication process is based on surface micromachining techniques, and allows for integration of SiCr or TaNthin filmresistors (TFR), metal-air-metal (MAM) capacitors, metal-insulator-metal (MIM) capacitors, and RF MEMS components. An RF MEMS fabrication process can be realized on a variety of wafers: III-V ...
It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45 mm × 15 mm × 15 mm (1.77 in × 0.59 in × 0.59 in). A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal ...