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:
Apr. 10, 2001
Filed:
Jul. 30, 1999
Marcus K. DaSilva, Peninsula Newman Lake, WA (US);
Ryan Lowell Hendrickson, Spokane, WA (US);
Agilent Technologies, Palo Alto, CA (US);
Abstract
A selected length of antenna for a device under test is placed within a conductive inner cylinder, forming an unterminated “input” coaxial transmission line. The inner cylinder is in turn within and coaxial with a conductive outer cylinder, forming an “output” transmission line. The inner cylinder is the center conductor of the output transmission line, and in a region extending beyond the extent of the antenna therein, conically tapers to being a normal center conductor of solid cross section. The outer cylinder matches this taper to maintain a constant characteristic impedance Z,(say, 50 &OHgr;) for the output transmission line, which then delivers its output signal to a matched terminating load in measurement equipment via either a coaxial connector or an interconnecting length of auxiliary transmission line. These triaxially nested input and output transmission lines are supported at a driven end by an RF tight box that contains a mounting fixture to support the device under test in a fixed and appropriate relation to the triaxially nested input and output transmission lines, and that is lined with anechoic RF absorbing material.