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:
Oct. 19, 2004
Filed:
Apr. 30, 2002
John E. Penn, Eldersburg, MA (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
A broadband, 4-bit MMIC phase shifter for use in a phased array antenna is provided. The four bit selectable phase shifter for use in a phased array antenna of the present invention, which selectably causes an input signal to be shifted in phase, includes a first bit for selectively providing a 180° phase shift, wherein the first bit is a line/reflected bit; a second bit for selectively providing a 90° phase shift, wherein the second bit is a reflected bit; a third bit for selectively providing a 45° phase shift, wherein the third bit is a reflected bit; and a fourth bit for selectively providing a 22.5° phase shift, wherein the fourth bit is a high pass/low pass bit. The phase shifter of the present invention is compact, broadband and has good insertion loss and balance, yet uses a standard 0.25 mm PHEMT process with standard bias voltages.