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:
Jun. 19, 2007
Filed:
Sep. 19, 2003
Antonius Johannes Matheus DE Graauw, Nijmegen, NL;
Antonius Johannes Matheus De Graauw, Nijmegen, NL;
NXP B.V., Eindhoven, NL;
Abstract
Antenna switches () in dual-band or multi-band mobile phones are according to a basic idea provided with a serial semiconductor switches () per transmitting branch () and with a further semiconductor switch () coupled in parallel to a receiving branch (), to obtain isolation between branches (-) in a simple way. Said semiconductor switches are PIN diodes or MEMS switches or pHEMT switches. Another semiconductor switch () coupled in parallel to the receiving branches (-) allows together with said further semiconductor () the introduction of elements () without a transmission line. Alternatively, the antenna switch () may comprise a transmission line (), in which case the receiving branches () can be switched via transistor switches (). This all improves isolation, reduces costs, complexity, size and high Radio-Frequency (RF) losses.