Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Reexamination Certificate
2001-11-06
2003-08-19
Clinger, James (Department: 2821)
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
C343S725000
Reexamination Certificate
active
06608602
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to dual port antenna systems, and more specifically to reducing the interference between connected transceivers.
BACKGROUND OF THE INVENTION
In recent years there has been an intense effort to provide increased functionality of mobile personal computing systems while at the same time decreasing the size of such systems. This has led to a desire to incorporate two transceivers within small computing systems such as notebook computers or PDAs. For example one transceiver may be used to provide a wireless connection between a laptop and a printer or mouse while another transceiver may be used to provide a wireless Ethernet (network) connection. The problem with having two transceivers in the same mobile computing device is that if the two transceivers are collocated with their antennas closely coupled, they will interfere with each other. This means that a portion of the power from one transceiver will enter, and interfere with, the other transceiver. For example, when the Ethernet connection is transmitting it may disrupt the wireless mouse connection and vice versa.
Various designs are being considered to electrically isolate the transceivers. Today, typical levels of electrical isolation in laptop devices are in the range of, approximately, 15-20 db. This is a measure of the relative signal strength of one transmitter received by, and impacting the performance of, the other transceiver. An isolation of 15-20 db indicates that about 1-2% of the power from one transceiver is interfering with the operation of the other transceiver.
This level of isolation is not sufficient to allow acceptable operation of both transceivers. In order for both transceivers to function properly, a level of isolation between the transceivers of approximately 35-40 db may be required.
REFERENCES:
patent: 5155495 (1992-10-01), Hately et al.
patent: 5751252 (1998-05-01), Phillips
patent: 6094178 (2000-07-01), Sanford
patent: 6377224 (2002-04-01), Gomez-Henry et al.
Schiffer Jeffrey L.
Waltho Alan E.
Blakely , Sokoloff, Taylor & Zafman LLP
Clinger James
LandOfFree
Method and apparatus for a high isolation dual port antenna... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for a high isolation dual port antenna..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for a high isolation dual port antenna... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3123162