Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2006-10-31
2006-10-31
Dinh, Trinh Vo (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S810000, C343S853000, C455S562100
Reexamination Certificate
active
07129892
ABSTRACT:
The invention is a planar antenna which comprises a plurality of antennas positioned relative to each other in a predetermined orientation. Each of the antennas is selectively electrically connectable to one or more of the other antennas. A plurality of switches electrically connect the plurality of antennas to each other. The switches are opened and closed by a signal operating at high speed enabling the antenna to act alternately in a first antenna configuration and a second antenna configuration using the same antenna structure. Doppler signals from the first and second antenna configurations are processed to determine the direction of a person or object in relation to a door.
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Borlez Yves
Secretin Laurent
B. E. A. SA
Dinh Trinh Vo
Woodling Krost and Rust
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