Antenna system for sharing of operation

Details Antenna system for sharing of operation Antenna system for sharing of operation

2006-06-19

2010-02-16

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

C343S7810CA

Reexamination Certificate

active

07663544

ABSTRACT:
An antenna system for sharing of operation employs contiguous transmit frequencies. Transmit frequencies are separated into non-contiguous sub-groups isolated from one another by filters158(+) and160(−) associated with positive and negative polarization. Received frequencies are filtered and split into five signals for input to base station receive ports. Non-contiguous transmit frequency sub-groups are combined by a quadrature hybrid110and pass with 90 degree relative phase shift to mutually orthogonal antenna stack ports P(+) and P(−) associated with orthogonally polarized sets of antenna elements AS(+) and AS(−): the ports P(+) and P(−) are isolated from one another by the hybrid110. The 90 degree phase shift results in one transmit subgroup being radiated with left hand circular polarization and the other transmit subgroup being radiated with right hand circular polarization. Changing the relative phase shift changes the radiated polarization to linear or elliptical, and signal amplitude weighting provides control of antenna beam polarization direction.

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