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:
Sep. 27, 2005
Filed:
Mar. 18, 2002
Zhinong Ying, Lund, SE;
Kenneth Håkansson, Malmö, SE;
Zhinong Ying, Lund, SE;
Kenneth Håkansson, Malmö, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
A mobile communications device has a multifrequency band antenna with a low band portion (LB) tuned to a low frequency band, and a first high band portion (HB) tuned to a first high frequency band at higher frequencies than the low frequency band. The low band portion (LB) and the first high band portion (HB) have a common first grounding point (GP), a common feeding point (FP) for feeding input signals to the antenna and for receiving signals from the antenna, and a first conductor portion (CP), which forms part of the low band portion (LB) and of the first high band portion (HB). The first conductor portion (CP) is electrically connected to the first grounding point (GP) and to the common feeding point (FP). A second high band portion (HB) is coupled to the first conductor portion (CP) and tuned to a second high frequency band at a higher frequency than the low frequency band and different from the first high frequency band. A switching network is connected between the second high band portion and ground, allowing the resonant frequency of the second high band portion to be varied, on the basis of a signal which depends on the operating mode of the device, thereby allowing four band operation.