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:
Apr. 06, 2010
Filed:
Aug. 03, 2009
Susumu Yoshimoto, Sayama, JP;
Susumu Yoshimoto, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
In order to reduce the parts required for matching of an SAW filter module, the SAW filter moduleobtains matching for coupling SAW filtersA toD with RF-IC 20 using impedance matching circuitsA toD. The real part of output impedance Z saw of the SAW filter is closely matched with the real part of input impedance Zic of an RF-IC. The impedance matching circuit modifies the imaginary part of the output impedance Zm of the SAW filter module according to the imaginary part of the input impedance Zic of the RF-IC 20. The impedance matching circuit composed of one piece of inductance or capacitor, or a plurality of inductors or capacitors in parallel connection, ans formed as a print pattern on a module substrate, in which the real part R saw and the real part Ric are in a relation nearly of 0.8 Ric<R saw<1.2 Ric.