Adaptive multifilar antenna

Details Adaptive multifilar antenna Adaptive multifilar antenna

2006-04-25

2006-04-25

Vannucci, James (Department: 2828)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S750000

Reexamination Certificate

active

07034773

ABSTRACT:
A multifilar antenna (200) comprises n spaced antenna filaments, where n is on integer greater than1;a matching circuit (210) for matching the characteristic impedance of the antenna to that of a transmitting and/or receiving apparatus; a weighting circuit (240) for applying respective gain and phase adjustments to signals passed to or from the n filaments; switch means (310) associated with each filament for selectively altering the electrical length and/or interconnections of the filaments; means for detecting electrical properties of the multifilar antenna with respect to the frequency, polarisation and/or direction of propagation of a signal to be received or transmitted by the multifilar antenna and/or impedance matching of the antenna; and control means (230), responsive to the detective means, for controlling the operation of the matching circuit (210), the weighting circuit (240) and the switch means (310) to adjust the properties of the multifilar antenna (200) to suit better a current signal to be received or transmitted.

REFERENCES:
patent: 5828348 (1998-10-01), Tassoudji et al.

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