Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1995-05-25
1997-01-14
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Spiral or helical type
H01Q 136
Patent
active
055944612
ABSTRACT:
A quadrifilar antenna has first, second, third and fourth quadrature antenna elements with signals in a respective quadrature phase relationship. The antenna elements are coupled through a quadrature matching network to a transceiver circuit representing a load or a source. The matching network includes first, second and third transmission lines which are arranged in a "Z" configuration. The first transmission line matches impedances between the first and second antenna elements and communicatively couples the second antenna element with a quarter wavelength phase shift of its signals to the first antenna element. The second transmission line matches impedances between the third and fourth antenna elements and communicatively couples the fourth antenna element with a quarter wavelength phase shift of its signals to the third antenna element. The third transmission line matches the resultant impedance of the coupled third and fourth antenna elements to the resultant impedance of the coupled first and second antenna elements and couples the third and fourth antenna elements to the coupled first and second antenna elements with a half wavelength phase shift of the respectively coupled signals. A fourth transmission line matches the resultant impedance of and couples the coupled first, second, third and fourth antenna elements to the load.
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Hajec Donald T.
Montanye G. A.
Murrah M. Lee
Phan Tho
Rockwell International Corp.
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