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:
Mar. 02, 2021
Filed:
Sep. 25, 2019
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Nedim Muharemovic, Nuremberg, DE;
Joonhoi Hur, Sunnyvale, CA (US);
Rastislav Vazny, Sunnyvale, CA (US);
Assignee:
APPLE INC., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 25/03 (2006.01); H04B 1/525 (2015.01); H04B 1/04 (2006.01); H04B 1/16 (2006.01); H04B 1/58 (2006.01); H03H 7/40 (2006.01); H04L 5/14 (2006.01); H03H 7/42 (2006.01); H03H 11/28 (2006.01); H03H 11/34 (2006.01);
U.S. Cl.
CPC ...
H04L 5/1461 (2013.01); H03H 7/42 (2013.01); H03H 11/28 (2013.01); H03H 11/344 (2013.01); H04B 1/04 (2013.01); H04B 1/16 (2013.01);
Abstract
An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.