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. 26, 2001
Filed:
Dec. 28, 1998
Hiroshi Mizutani, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a semiconductor phase shifter, a high-pass signal path and a low-pass signal path are connected in parallel between an input terminal and an output terminal. The high-pass signal path in constructed by first and second transmission lines connected to the input and output terminals and having an effective length of &lgr;/4, where &lgr; is a wavelength of propagating signals, at least one first field effect transistor connected between the first and second transmission lines, and at least two third transmission lines each connected of the first field effect transistor and to a ground terminal. The low-pass signal path is constructed by fourth and fifth transmission lines connected to the input and output terminals and having an effective length of &lgr;/4, at least one sixth transmission line connected between the fourth and fifth transmission lines, and at least two second field effect transistors each connected to the sixth transmission line and to the ground terminal. Each of the third and sixth transmission lines serves as an inductor.