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:
May. 15, 2001
Filed:
Sep. 01, 1998
Tsutomu Koda, Gifu, JP;
Akira Mishima, Gifu, JP;
Tetsuya Ozaki, Aichi, JP;
Seiji Matsushita, Aichi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A high frequency apparatus includes an input terminal,, a high frequency filter,to which a signal input into the input terminal,is supplied, a mixer,one input of which an output signal of the high frequency filter,is supplied to and an other input of which an output signal of a local oscillator,is supplied to, an intermediate frequency filter,to which an output signal of the mixer,is supplied, an output terminal,to which an output signal of the intermediate frequency filter,is supplied, and an electronic switch,. The electronic switch is provided in the vicinity of the intermediate frequency filter,, for making a passband characteristic of the intermediate frequency filter,substantially flat by closing both contacts, wherein opening and closing of the electronic switch,is controlled externally. Accordingly, the adjusting error of the high frequency filter can be reduced.