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"Frequency Agile Filter Using A Digital Filter And Bandstop Filtering"
Abstract: The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures systems capable of spectrum re- farming and software defined radios. It performs low -loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband. It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers. The first path comprising a component such as a delay component or duplexer. The second path comprising a bandstop filter connected to a down converter, a digital filter, and an up converter. At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints. At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.
Notices, Deadlines & Correspondence
Patent Information
Applicants
NORTEL NETWORKS LIMITED
Inventors
1. MARK WYVILLE
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 4439-DELNP-2011-GPA-(14-09-2011).pdf | 2011-09-14 |
| 2 | 4439-DELNP-2011-Correspondence-Others-(14-09-2011).pdf | 2011-09-14 |
| 3 | 4439-delnp-2011-Correspondence-others-(13-12-2011).pdf | 2011-12-13 |
| 4 | 4439-delnp-2011-Assignment-(13-12-2011).pdf | 2011-12-13 |
| 5 | 4439-delnp-2011-Form-3-(07-02-2012).pdf | 2012-02-07 |
| 6 | 4439-delnp-2011-Correspondence-others-(07-02-2012).pdf | 2012-02-07 |
| 7 | 4439-delnp-2011-Form-5.pdf | 2012-02-25 |
| 8 | 4439-delnp-2011-Form-3.pdf | 2012-02-25 |
| 9 | 4439-delnp-2011-Form-2.pdf | 2012-02-25 |
| 10 | 4439-delnp-2011-Form-1.pdf | 2012-02-25 |
| 11 | 4439-delnp-2011-Drawings.pdf | 2012-02-25 |
| 12 | 4439-delnp-2011-Description (Complete).pdf | 2012-02-25 |
| 13 | 4439-delnp-2011-Correspondence-others.pdf | 2012-02-25 |
| 14 | 4439-delnp-2011-Claims.pdf | 2012-02-25 |
| 15 | 4439-delnp-2011-Abstract.pdf | 2012-02-25 |
| 16 | 4439-delnp-2011-Correspondence-Others-(06-03-2012).pdf | 2012-03-06 |
| 17 | 4439-delnp-2011-Form-18-(19-10-2012).pdf | 2012-10-19 |
| 18 | 4439-delnp-2011-Correspondence-Others-(19-10-2012).pdf | 2012-10-19 |
| 19 | 4439-DELNP-2011-FER.pdf | 2017-12-22 |
| 20 | 4439-DELNP-2011-AbandonedLetter.pdf | 2018-08-11 |
Search Strategy
| 1 | search_21-12-2017.pdf |