Reflection cancellation circuit for a radio frequency power...

Details Reflection cancellation circuit for a radio frequency power... Reflection cancellation circuit for a radio frequency power...

2011-05-10

2011-05-10

Nguyen, Duc (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C330S010000, C330S149000

Reexamination Certificate

active

07941105

ABSTRACT:
The present invention is an RF cancellation circuit located between the output of a power amplifier and downstream circuitry, such as a transmitting antenna. The RF cancellation circuit cancels reflections resulting from antenna impedance mismatches, thereby presenting a constant load impedance to the output of the power amplifier. The RF cancellation circuit extracts a portion of the reflected signal, phase-shifts by 180 degrees and amplifies the extracted portion of the reflected signal to create a cancellation signal, and then cancels the balance of the reflected signal by adding in the cancellation signal. Directional circuitry is used to process the reflected signals without interfering with normal transmitted signals. Presenting a constant load impedance to the output of the power amplifier helps facilitate compliance with total radiated power into load mismatch specifications.

REFERENCES:
patent: 5258722 (1993-11-01), Jeffers
patent: 2008/0079547 (2008-04-01), Alicot et al.

Affiliated with

Also associated with

Rating

Reflection cancellation circuit for a radio frequency power... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reflection cancellation circuit for a radio frequency power..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reflection cancellation circuit for a radio frequency power... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2676706