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. 04, 1977
Filed:
Jul. 11, 1972
Kunito Miyamoto, Kitano, JA;
Abstract
An input device for a tuner utilizing as an amplifier element a bipolar transistor or tetrode metal-oxide-semiconductor field-effect transistor is provided in which an impedance means is connected in parallel with an impedance of an antenna; a capacitor means is inserted between the input terminal of the amplifier element and a group of tuning coils or inductance means for selecting the television channels in the high frequency band when a channel in the high frequency band is selected whereas an inductance means is inserted between the input terminal and a group of tuning coils for selecting the channels in the low frequency band when a channel in the low frequency band is selected; and an impedance means is inserted between the input terminal of the amplifier element and the earth. The tuning frequency band widths or selectivities in both the high and low frequency bands may be made substantially equal without causing the loss due to the impedance mismatching even when the input impedance of the amplifier element varies greatly in response to the change in frequency.