Broadband cylindrical antenna and method
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsDavid A Tonn, Susan M Safford
Life of this patent
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Abstract
An antenna capable of being joined to an antenna feed and being positioned perpendicular to a ground plane includes a conductive cylinder having a longitudinal slot. The antenna feed is connected across the slot. A plurality of dielectric rods are provided parallel to the slot with rod being positioned much less than one wavelength of the maximum operating frequency away from adjacent rods. The rods each have a length of at least 25 times its mean diameter is made from a material having a dielectric constant greater than 30. The combination of the conductive cylinder and dielectric rods provides increased bandwidth. A kit for modifying existing antennas is further provided.
Claims16
An antenna capable of being joined to an antenna feed and being positioned perpendicular to a ground plane comprising:
- a conductive cylinder being substantially tubular and having a slot formed therein from a first end of the conductive cylinder to a second end of the conductive cylinder parallel to an axis of the conductive cylinder, the antenna feed being connectable to the conductive cylinder adjacent to and across the slot;
- and
- a plurality of dielectric rods parallel to the slot in said conductive cylinder, each said rod being positioned much less than one wavelength of the maximum operating frequency away from adjacent rods, each said rod having a length of at least 25 times its mean diameter and each rod being made from a material having a dielectric constant greater than 30.
A kit for modifying a slotted cylinder antenna positioned vertically above a ground plane comprising a plurality of dielectric rods parallel to the slot in said slotted cylinder antenna, each said rod being positioned much less than one wavelength of the maximum operating frequency of the slotted cylinder antenna away from adjacent rods, each said rod having a length of at least 25 times its mean diameter and each rod being made from a material having a dielectric constant greater than 30.
Dependencies are inferred from the claim text.