Multiband television/communications antenna
First Claim
1. A unitary multiband antenna for a vehicle having plural antennas operating at different frequencies and polarities comprising:
- a housing adapted for mounting to said vehicle;
a television receiving antenna carried within said housing generally in a horizontal plane operating within a band of television frequencies, and said television antenna having a horizontally polarized radiation pattern;
a 2-way communications antenna for transmitting and receiving communication signals carried in a vertical plane by said housing having a vertically polarized radiation pattern; and
said television antenna including a generally J-shaped configuration having a first element radiating on a high band of VHF frequencies, a second antenna element radiating in a band of UHF frequencies, and said first and second elements operating together as a third radiating element to produce radiation in a low band of VHF frequencies.
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Accused Products
Abstract
A unitary, multiband and dual polarity mobile antenna (A) is disclosed for vehicles and the like which includes a television antenna (B) having a horizontally polarized radiation pattern and a 2-way communications antenna (C) having a vertically polarized radiation pattern. A null current point (50) is created on communications antenna (C) by a phasing coil (34) which is intersected by a horizontal plane (52) in which television antenna (B) lies. This reduces cross-coupling, cross-polarization, and interference between the two antenna during operation. Horizontal television antenna (B) includes a J-folded, generally boomerang shaped, curved antenna configured to have a radiating element (20) and a half radiating element (22). These elements together form a third radiating element providing operation at three resonant frequencies.
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Citations
15 Claims
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1. A unitary multiband antenna for a vehicle having plural antennas operating at different frequencies and polarities comprising:
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a housing adapted for mounting to said vehicle; a television receiving antenna carried within said housing generally in a horizontal plane operating within a band of television frequencies, and said television antenna having a horizontally polarized radiation pattern; a 2-way communications antenna for transmitting and receiving communication signals carried in a vertical plane by said housing having a vertically polarized radiation pattern; and said television antenna including a generally J-shaped configuration having a first element radiating on a high band of VHF frequencies, a second antenna element radiating in a band of UHF frequencies, and said first and second elements operating together as a third radiating element to produce radiation in a low band of VHF frequencies. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A unitary multiband vehicle antenna for receiving television signals and for receiving and transmitting communications signals in a composite antenna structure comprising:
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a 2-way communication antenna for transmitting and receiving communications signals having a vertically polarized radiation pattern; a television antenna for receiving television signals having a horizontally polarized radiation pattern; a vehicle ground plane defined by a body of said vehicle; mounting means for mounting said two way communication antenna and television antennas in reference to said vehicle ground plane in a manner that current flow occurs at the base of said communications antenna and said vehicle body acts as part of the antenna; said communications antenna being carried in an upward configuration by said mounting means and said television antenna being carried in a horizontal plane by said mounting means; a current null point created at a point along the length of said communications antenna; and said horizontal plane of said television antenna intersecting said current null point of said communications antenna in said vertically polarized radiation pattern as mounted by said mounting means. - View Dependent Claims (8, 9)
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10. A unitary multiband vehicle antenna comprising:
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a first antenna lying in a vertical plane having a vertically polarized radiation pattern; a second antenna lying in a horizontal plane having a horizontally polarized radiation pattern; means for creating a current null point on said first antenna as said first antenna extends through said horizontal plane of said second antenna; housing means in which said first and second antennas are carried; said vertical plane of said first antenna and said horizontal plane of said second antenna intersecting one another at said current null point within said housing; and said current null point providing intersection of said vertical and horizontal planes with minimized cross-coupling and interference between said antennas. - View Dependent Claims (11, 12)
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13. A unitary multiband vehicle antenna for operating over a variety of functional band frequencies from within a single compact housing, said antenna comprising:
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a first antenna having a vertically polarized radiation pattern operating over a first band of frequencies; a second antenna having a horizontally polarized radiation pattern operating over a second band of frequencies; a housing for said first and second antennas which includes a narrow upstanding base portion adapted for attachment to said vehicle; a widened upper portion of said housing widened with respect to said upstanding base portion generally in a horizontal plane and extending over said upstanding base portion; said first antenna having a first radiating element lying in a vertical plane extending upwardly through said upstanding base, and a second radiating element extending upwardly from the exterior of said housing at an angle of about 0 to 30 degrees with respect to the vertical; and said second antenna being carried in said widened portion of said housing generally in a horizontal plane, said vertical plane of said first antenna and said horizontal plane of said second antenna intersecting one another at an intersection point in said housing. - View Dependent Claims (14, 15)
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Specification