Digitally controlled circulator and radio frequency...

Details Digitally controlled circulator and radio frequency... Digitally controlled circulator and radio frequency...

2008-07-08

2008-07-08

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

C333S02400C

Reexamination Certificate

active

11499440

ABSTRACT:
Provided are a digitally controlled circulator and a radio frequency identification (RFID) reader having the circulator. A power splitter is composed of lumped elements and the values of the elements are digitally changed using switching means, in which the transmission loss of a signal is controlled according to whether the reader is in a transmission state or a reception state. Therefore, the loss can be minimized, and the circulator can be miniaturized and priced down by an integrated circuit (IC) semiconductor process and mounted in a mobile terminal such as a cellular phone.

REFERENCES:
patent: 3676803 (1972-07-01), Simmons
patent: 5144266 (1992-09-01), Dougherty et al.
patent: 6838989 (2005-01-01), Mays et al.
patent: 2005/0156039 (2005-07-01), Carrender et al.
“Power and Noise Limitations of Active Circulators” by Geert Carchon et al.;IEEE Transactions on Microwave Theory and Techniques, vol. 48, No. 2, Feb. 2000; pp. 316-319.

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