Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1996-02-20
1997-09-16
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343790, 343792, 343715, H01Q 916, H01Q 132
Patent
active
056685645
ABSTRACT:
A combined AM/FM/cellular telephone antenna system comprises a coaxial cable with an upper portion of the inner conductor of the coaxial cable and an adjacent section of the coaxial cable together forming a cellular telephone dipole antenna. The coaxial cable forms a transmission line connecting the cellular dipole antenna to cellular telephone equipment. The outer conductor of a portion of the coaxial cable below the cellular dipole antenna serves as the AM/FM antenna. The combined antenna is encaged in a fiberglass housing and mounted on a metallic base having an upper shell and a lower shell. The upper shell is electrically connected to the outer conductor of the coaxial cable forming the antenna and the lower shell is connected to a ground plane. A coaxial cable having a center conductor connected to the upper shell and an outer conductor connected to the lower shield provides connection to AM/FM receiver equipment. Another coaxial cable having a center conductor connected to the center conductor of the antenna and an outer conductor connected to the lower shell provides connection to cellular telephone apparatus. A dielectric between the upper and lower shells provides a capacitance with low impedance in the cellular telephone frequency range and a high impedance in the AM/FM frequency range.
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Ennenga Robert B.
Lynas Robert M.
Miller Paul E.
Seward Glen J.
Le Hoanganh T.
R.A. Miller Industries, Inc.
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