Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2002-01-22
2003-05-06
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S702000, C343S900000
Reexamination Certificate
active
06559811
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to an antenna, and more particularly to an antenna adapted to operate in more than one frequency band.
BACKGROUND OF THE INVENTION
With the increased use of wireless communication devices, available spectrum to carry communication signals is becoming limited. In many cases, network operators providing services on one particular band have had to provide service on a separate band to accommodate its customers. For example, network operators providing service on the Global System of Mobile (GSM) communication system in a 900 MHz frequency band have had to also rely on operating on the Digital Communication System (DCS) at an 1800 MHz frequency band. Accordingly, wireless communication devices, such as cellular radiotelephones, must be able to communicate at both frequencies, or possibly a third frequency spectrum, such as the Personal Communication System (PCS) 1900 MHz.
Such a requirement to operate at two or more frequencies creates a number of problems. For example, the wireless communication device must have an antenna adapted to receive signals on more than one frequency band. Also, as wireless communication devices decrease in size, there is a further need to reduce the size of an antenna associated with the device.
Further, while an extendible antenna offers certain advantages, such an antenna poses problems to an end user. Because the antenna will typically perform better when in the extended position, the user is required to extend the antenna before operating the wireless communication device. Users may not regularly do this as the device may usually operate with the antenna in a retracted position, and this action requires extra effort. As a result, many end users prefer a fixed or “stubby” antenna which does not need to be extended during operation. However, the fixed antenna must provide multi-band functionality.
Prior art approaches to provide multiple band operation include separate antenna elements fed from a common or multiple feed points configured in a co-located arrangement. These elements are individual resonators that do not shared components and therefore take up more room than necessary.
Accordingly, there is a need for a small fixed antenna adapted to receive signals in multiple frequency bands. In addition, it would be of benefit if the different resonant elements of the antenna shared at least of portion of the other resonant elements. It would also be advantageous to provide the antenna structure in a compact, fixed structure.
REFERENCES:
patent: 4442438 (1984-04-01), Siwiak et al.
patent: 5600341 (1997-02-01), Thill et al.
patent: 5812097 (1998-09-01), Maldonado
patent: 5990848 (1999-11-01), Annamaa et al.
patent: 6054966 (2000-04-01), Haapala
patent: 6127979 (2000-10-01), Zhou et al.
patent: 6140973 (2000-10-01), Annamaa et al.
patent: 6198440 (2001-03-01), Ha et al.
patent: 6201500 (2001-03-01), Fujikawa
patent: 6288681 (2001-09-01), Kim et al.
patent: 6348900 (2002-02-01), Blom
patent: 6448934 (2002-09-01), Lee et al.
patent: 2002/0097192 (2002-07-01), Chang et al.
Cash Christopher P.
Pulimi Narendra
Chen Shih-Chao
Mancini Brian M.
Motorola Inc.
Wong Don
LandOfFree
Antenna with branching arrangement for multiple frequency bands does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna with branching arrangement for multiple frequency bands, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna with branching arrangement for multiple frequency bands will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3051296