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:
Aug. 15, 1995
Filed:
Jul. 30, 1993
Fumihiko Kobayashi, Kawasaki, JP;
Eiji Itaya, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A loop testable radio transmitter/receiver includes a transmission system which includes a transmission frequency converting unit and a transmission signal filter unit. A receiving system is provided, including a receiving signal filter and a receiving frequency converter. The transmitter/receiver further includes a transmitter/receive sharing unit, a transmission signal looping unit for attenuating the transmission signal of the transmission system and for looping back it to the receiving system, and a shifter arranged to the output side of the receiving frequency converting unit in the receiving system for converting an intermediate frequency of a signal converted by the receiving frequency converting unit into the receiving input frequency of a modulator/demodulator.