Low profile antenna
First Claim
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1. An antenna comprising:
- at least two separated upright conductors each independently excited by a common signal, with the common signal equally divided among the upright conductors, with each of the upright conductors extending from adjacent to a ground plane of the antenna to a point of common height above the ground plane, and with each upright conductor having a top loading structure of a conductor for impedance adjustment, with the top loading structure attached to its upright conductor at the point of the common height, and with the top loading structure extending away from the other upright conductors in a single horizontal plane, and all the top loading structures having a common length.
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Abstract
The invention is a low profile antenna array, particularly beneficial for AM broadcasting stations, which dramatically reduces the height of the antenna. The antenna array is constructed of at least two conductors oriented horizontally or sloping slightly up and extending away from a center location where they have upright sections extending above the ground plane by as little as 0.01 wavelength. The individual conductors are each approximately one-quarter wavelength long. The multiple conductors of the antenna array are each fed by impedance matching sections to achieve high individual impedances, which, when connected in parallel can be made to match any desired impedance with dimensional changes.
19 Citations
15 Claims
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1. An antenna comprising:
at least two separated upright conductors each independently excited by a common signal, with the common signal equally divided among the upright conductors, with each of the upright conductors extending from adjacent to a ground plane of the antenna to a point of common height above the ground plane, and with each upright conductor having a top loading structure of a conductor for impedance adjustment, with the top loading structure attached to its upright conductor at the point of the common height, and with the top loading structure extending away from the other upright conductors in a single horizontal plane, and all the top loading structures having a common length. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An antenna comprising:
at least two separated conductors each independently excited by a common signal source, with each of the conductors having an upright section extending from adjacent to a ground plane of the antenna to a point of common height above the ground plane, with each upright section having top loading structure of a conductor for impedance adjustment, with the top loading structure attached to its upright section at the point of the common height, and with the top loading structure sloping up as it extends away from the other conductors, and all the top loading structures having a common length. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
Specification