IQ combiner technology in modulated backscatter system

Details IQ combiner technology in modulated backscatter system IQ combiner technology in modulated backscatter system

1996-12-31

1998-07-21

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

455106, 455283, 329304, 342 44, 342 51, 34087007, 34087018, H03C 152

Patent

active

057846863

ABSTRACT:
In accordance with the present invention, an RFID system has a homodyne receiver having two outputs; the in-phase or I output and the quadrature or Q output. The modulated backscattered signal is composed of an information signal, modulated onto a single frequency subcarrier signal, generating a modulated subcarrier signal; this modulated subcarrier signal is then backscatter modulated onto the incoming RF signal. To demodulate this modulated backscattered signal, the I and Q outputs are combined using an IQ combiner. This IQ combiner introduces a 90.degree. phase shift, with respect to the frequency of the subcarrier signal, onto one of the demodulator outputs and then combines the outputs of the demodulator.

REFERENCES:
patent: 3944928 (1976-03-01), Augenblick et al.
patent: 3984835 (1976-10-01), Kaplan et al.
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4360810 (1982-11-01), Landt
patent: 4471345 (1984-09-01), Barrett, Jr.
patent: 4510495 (1985-04-01), Sigrimis et al.
patent: 4584534 (1986-04-01), Lijphart et al.
patent: 4641374 (1987-02-01), Oyama
patent: 4691202 (1987-09-01), Denne et al.
patent: 4816839 (1989-03-01), Landt
patent: 4888591 (1989-12-01), Landt et al.
patent: 4937581 (1990-06-01), Baldwin et al.
patent: 4963887 (1990-10-01), Kawashima et al.
patent: 5030807 (1991-07-01), Landt et al.
patent: 5214409 (1993-05-01), Beigel
patent: 5305008 (1994-04-01), Turner et al.
patent: 5305459 (1994-04-01), Rydel
patent: 5339073 (1994-08-01), Dodd et al.
patent: 5347263 (1994-09-01), Carroll et al.
patent: 5420757 (1995-05-01), Eberhardt et al.
patent: 5426667 (1995-06-01), van Zon
patent: 5461385 (1995-10-01), Armstrong
patent: 5477215 (1995-12-01), Mandelbaum
patent: 5479160 (1995-12-01), Koelle
patent: 5479416 (1995-12-01), Snodgrass et al.
patent: 5521944 (1996-05-01), Hegeler et al.
patent: 5523749 (1996-06-01), Cole et al.
patent: 5640683 (1997-06-01), Evans et al.
patent: 5649295 (1997-07-01), Shober et al.
patent: 5649296 (1997-07-01), MacLellan et al.

Affiliated with

Also associated with

Rating

IQ combiner technology in modulated backscatter system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with IQ combiner technology in modulated backscatter system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IQ combiner technology in modulated backscatter system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1658330