Title:
A METHOD AND APPARATUS FOR CANCELING THE TRANSMITTED SIGNAL
Document Type and Number:
WIPO Patent Application WO2005089427
Kind Code:
A3
Abstract:
An apparatus comprises a transmitter (100), a receiver (190), an antenna (180)and a signal cancellation circuit (300). The transmitter (100)is configured to send a transmitter signal associated with a frequency. The receiver is associated with the frequency. The antenna (180)is coupled to the transmitter (100) and the receiver (190). The signal cancellation circuit is coupled to the transmitter (100), the receiver (190) and the antenna. The signal cancellation (300) circuit is configured to phase shift a first portion of the transmitter signal to produce a phase-shifted signal. The signal cancellation circuit is configured to combine the phase-shifted signal with a second portion of the transmitter signal to produce a combined signal. The second portion of the transmitter signal is associated with a reflection of a third portion of the transmitter signal from the antenna. The first portion, the second portion and the third portion of the transmitter signal are different from each other.
Inventors:
SAUNDERS STUART B (US)
TIMMONS RICHARD (US)
TIMMONS RICHARD (US)
Application Number:
PCT/US2005/008902
Publication Date:
November 09, 2006
Filing Date:
March 17, 2005
Export Citation:
Assignee:
SAMSYS TECHOLOGIES INC (CA)
SAUNDERS STUART B (US)
TIMMONS RICHARD (US)
SAUNDERS STUART B (US)
TIMMONS RICHARD (US)
International Classes:
H04B15/00; H03C1/52; H04B1/44; H04B7/14
Foreign References:
| US6567648B1 | 2003-05-20 | |||
| US6686830B1 | 2004-02-03 | |||
| US20040101067A1 | 2004-05-27 |
Other References:
See also references of EP 1741213A4
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