Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1986-07-03
1988-05-31
Sikes, William L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343715, 343791, 343883, 343901, 343822, H01Q 132
Patent
active
047484500
ABSTRACT:
A multiband antenna mounting and feedline coupling arrangement includes a first transmission line segment secured in a mounting device for the antenna for coupling energy to and from the antenna. A second transmission line segment, extending, e.g., to grounded high band equipment, provides high band signal coupling with the first line and includes a direct current blocking capacitor in series in the ground return path of that second line segment, the capacitor having such a low impedance to high band energy that it presents negligible impedance to such energy. A third transmission line segment provides low band signal coupling with the first line by way of a part of the ground return path of the first line. A high band quarter wave, in the high band, filter stub transmission line is connected between the signal and ground return paths of the third transmission line adjacent to the point of coupling thereof to the first line. Several different implementations of the capacitor and transmission line segment combination are illustrated.
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Hines John N.
Myer Robert E.
American Telephone and Telegraph Company AT&T Bell Laboratories
Cubert Jack S.
Johnson Doris J.
Phelan Charles S.
Sikes William L.
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