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:
Nov. 22, 2011
Filed:
Jul. 27, 2009
Paul Bradley, Los Altos, CA (US);
Shen YE, Cupertino, CA (US);
Ji-fuh Liang, San Jose, CA (US);
Avago Technologies Wireless IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A duplexer interfacing a receiver and a transmitter with an antenna includes first and second filters. The first filter includes at least four first series resonators, four first shunt resonators respectively connected between the four first series resonators and ground voltage, and a mutual inductance commonly connected between two adjacent first shunt resonators. The second filter includes at least four second series resonators, four second shunt resonators respectively connected between the four second series resonators and the ground voltage, and a cross-coupling capacitor connected between a first capacitor node connected to at least one of the second series resonators and a second capacitor node connected to one of the second shunt resonators, and an inductor connected in series between second capacitor node and ground. Three of the second series resonators and the second shunt resonator to which the cross-coupling capacitor is connected are between the first and second capacitor nodes.