Microwave crystal holder
AssigneeSociete Lignes Telegraphiques et Telephoniques
InventorsJean-Rene Mahieu, Michel Robin
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Abstract
A wafer type millimetric crystal holder of the Sharpless type with an impedance matched i.f. coaxial output. The connection between the i.f. coaxial output and the diode comprises two coaxial quarter wavelength stubs interconnected by a strip line element with a wire central conductor operating as a rejector at the carrier frequency. The diameter of the central conductor is determined by the impedance matching condition.
Claims3
A wafer crystal holder for frequency converters operating at millimeter wavelength, comprising a high conductivity metallic body having a square slot in an end face thereof, and a rectangular aperture in a side face thereof through which a modulated carrier frequency and a local frequency are propagated, a cylindrical aperture on said side face, two coaxial stubs, one quarter wavelength at carrier frequency, the first one located between said rectangular aperture and said cylindrical aperture, the second one between said cylindrical aperture and said square slot, an output standard coaxial connection for intermediate frequency positioned within said slot, a wafer crystal located in said rectangular aperture in contact with one end of the first of said stubs, and means connecting the ends of said stubs in said cylindrical aperture by a wire the length of which is an odd number of quarter wavelengths at said carrier frequency and the diameter of which is selected so that the output impedance at the intermediate frequency is matched to the characteristic impedance of said standard coaxial output connection.
Dependencies are inferred from the claim text.