Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
2006-05-16
2006-05-16
Urban, Edward F. (Department: 2685)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S041200, C342S044000, C375S222000, C375S279000, C375S312000, C375S315000
Reexamination Certificate
active
07046957
ABSTRACT:
A modulator circuit comprises a negative impedance amplifier which is operable such that a signal applied to the amplifier is reflected and amplified. Switching circuitry is provided for switching the impedance of the amplifier between two reflecting states such that the reflected and amplified signal is phase modulated. The impedances of the negative impedance amplifier are selected such that the phase of the reflected and amplified signal switches by substantially 180°. Preferably, the impedances of the negative impedance amplifier in the two reflecting states are selected such that the reflection gain of the amplifier in the two reflecting states is substantially the same such that the reflected and amplified signal is a binary phase shift keyed.
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Farr Adrian N
Forster Ian J
Christensen O'Connor Johnson & Kindness PLLC
Jackson Blane J.
Urban Edward F.
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