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:
Jul. 07, 1987
Filed:
Dec. 20, 1985
Inder J Bahl, Roanoke, VA (US);
ITT Gallium Arsenide Technology Center, a division of ITT Corporation, Roanoke, VA (US);
Abstract
A gallium arsenide isolator has a common gate FET for amplifying a microw signal, the common gate FET being connected to a common drain FET for transmitting the microwave signal and for isolating the common gate FET from signals travelling in a direction opposite to the microwave signal. One or more L-C networks are connected at one end between the input and output of the isolator and at the other end to ground. The circulator includes three arms each having a gallium arsenide isolator. Each of the arms is coupled to another one of the arms by means of a four port coupler which permits transmission of a signal from one port to a second diagonally opposite port, the third port receiving a fixed fraction of the power and the fourth port receiving effectively no power.