The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2006
Filed:
Feb. 06, 2002
Susan E. Bach, Redondo Beach, CA (US);
Kurt W. Loheit, Rancho Palos Verdes, CA (US);
Remy O. Hiramoto, Hermosa Beach, CA (US);
Daniel H. Koyama, Torrance, CA (US);
Suzanne E. Kubasek, El Segundo, CA (US);
Craig Schulz, Fremont, CA (US);
Susan E. Bach, Redondo Beach, CA (US);
Kurt W. Loheit, Rancho Palos Verdes, CA (US);
Remy O. Hiramoto, Hermosa Beach, CA (US);
Daniel H. Koyama, Torrance, CA (US);
Suzanne E. Kubasek, El Segundo, CA (US);
Craig Schulz, Fremont, CA (US);
The Boeing Company, Chicago, IL (US);
Abstract
In a system for modulating an RF carrier, the RF carrier is fed through a lowpass filter and phase shifted approximately −90 degrees. The RF carrier is also fed through a high pass filter and phase shifted approximately +90 degrees. A switch connected to the output of the lowpass filter and connected to the output of the highpass filter, selects and outputs either the −90 degree phase shifted carrier output from the lowpass filter or the +90 degree phase shifted carrier output from the highpass filter depending on a switching state determined by data bit information received at a data port to produce a BPSK modulated RF carrier. Two such BPSK modulators may be combined using lowpass and highpass filters to form a QPSK modulator. Two such QPSK modulators may be combined with an attenuator to form a QAM modulator.