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:
Dec. 10, 2024
Filed:
Jun. 01, 2023
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Joonhoi Hur, Sunnyvale, CA (US);
Rastislav Vazny, Sunnyvale, CA (US);
Assignee:
Apple. Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/00 (2006.01); H03F 1/02 (2006.01); H03F 1/56 (2006.01); H04B 1/12 (2006.01); H04B 1/38 (2015.01);
U.S. Cl.
CPC ...
H04B 1/0057 (2013.01); H03F 1/0288 (2013.01); H03F 1/56 (2013.01); H04B 1/123 (2013.01); H03F 2200/451 (2013.01);
Abstract
A duplexer may be used to isolate a transmitter and a receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the duplexer to cut-off access to the common antenna rather than duplicate the antenna impedance, the duplexer is balanced. Such cut-offs may have a lower insertion loss than a duplexer that merely duplicates the antenna impedance to separate the differential signals of the receiver and transmitter from the common mode signal.