The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1985
Filed:
Aug. 15, 1983
Arlen K Johnson, New Providence, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
Microwave devices are fabricated by a method wherein a block of dielectric material is conformed to the physical configuration of a required microwave device, and it is then coated with electrically conductive material. Portions of the coating material are removed from predetermined regions of the block to implement a predetermined microwave device. One microwave device fabricated in accordance with the foregoing method is shown, and comprises an interdigital bandpass filter in which the block is shaped and drilled with a line of parallel holes to define the physical configuration of an interdigital filter in which the interiorly-coated drilled holes comprise resonator rods within a microwave cavity formed by the exteriorly-coated remaining portions of the dielectric material block. Coating material is removed from end portions of the rods formed by the coated holes in order to fine-tune the filter to a desired center frequency in the band of operation.