Communications: radio wave antennas – Antennas – Slot type
Reexamination Certificate
2000-02-11
2001-11-06
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Slot type
C343S770000
Reexamination Certificate
active
06313806
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an antenna for the broadcast of electromagnetic wave energy and, more particularly, to class of antennas known as slotted antennas.
2. Description of the Prior Art
Slotted antennas generally have a conductive mast that has a plurality of layers with one or more slots in each layer that are positioned along the axial direction of the mast. Slotted antennas have been used to radiate horizontally polarized waves for television applications. To impart elliptical or circular polarization, separate dipoles have been placed in juxtaposition to the slots. The dipoles are operable to provide a vertical component of radiation to the horizontal component provided by the slots. Examples of slotted antennas with elliptical polarization are disclosed in U.S. Pat. Nos. 4,129,871 and 4,899,165.
Some slotted antennas require a standing wave design. A standing wave design requires the admittance of each layer to add in parallel such that the resulting input admittance achieves a desired bandwidth at the antenna input. In order to achieve the best overall bandwidth at the antenna input, it is desirable to add up admittances of the layers along the real axis of the Smith chart. The slots of current standing wave antennas tend to have a high enough susceptance that it is difficult to achieve the best overall bandwidth at the antenna input.
An object of the present invention is to provide an antenna with reduced slot susceptance and improve antenna bandwidth.
SUMMARY OF THE INVENTION
An antenna according to the present invention includes a conductive mast having one or more slots that extend axially of the mast. A coupler is disposed within the mast to provide energy for exciting the slots to radiate waves of energy. Conductors are individually connected across the slots and positioned at a location of the mast that reduces the antenna susceptance and increases the antenna conductance with a minimal effect on the antenna radiation in the azimuth.
The conductors may extend across the slots perpendicularly to the axial direction of the mast or at an angle thereto. The location of the conductor relative to the slot is selected to give minimum susceptance and cause minimal effect to the radiation in the azimuth.
REFERENCES:
patent: 2658143 (1953-11-01), Fiet et al.
patent: 2724774 (1955-11-01), Fiet
patent: 3149336 (1964-09-01), Nikolayuk
patent: 3176300 (1965-03-01), Kuecken
patent: 3340534 (1967-09-01), Fee
patent: 4119970 (1978-10-01), Bogner et al.
patent: 4129871 (1978-12-01), Johns
patent: 4223315 (1980-09-01), Alford
patent: 4899165 (1990-02-01), Schadler
General Signal Corporation
Pepper Hamilton LLP
Wimer Michael C.
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