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US 8,576,135 B1Granted
Bicone antenna
AssigneeOlympus Corporation
InventorIvan Krivokapic
Life of this patent
Estimating the term…
Abstract
A bicone antenna is provided with high bandwidth and beneficial return loss performance. The antenna is dipole based and thus its radiation pattern is not strongly influenced by shape and size of a nearby ground plane. A parasitic element comprising a conductive band encircling the antenna's feed structure improves matching, gain flatness, and makes the antenna less susceptible to detuning.
Claims18
A bicone antenna, comprising:
- a dielectric body having an upper portion, a lower portion, and a central portion coaxial with the upper portion and lower portion and located between the upper portion and the lower portion;
- a first frustum shaped cavity formed in the upper portion of the body with the apex of the first frustum shaped cavity adjacent to the central portion, wherein the first frustum shaped cavity is coated with a first conducting material and is connectable to an antenna feed element;
- a second frustum shaped cavity formed in the lower portion of the body with the apex of the second frustum shaped cavity adjacent to the central portion, wherein the second frustum shaped cavity is coated with a second conducting material and is connectable to a ground element;
- a cylindrical cavity formed in the central portion, the cylindrical cavity connecting the apex of the first frustum shaped cavity and the apex of the second frustum shaped cavity, the cylindrical cavity lacking a coating of conducting material and having a cross-sectional area sufficient to receive the antenna feed element;
- and
- a parasitic element encircling the central portion and comprising a band of a third conducting material, wherein the parasitic is separated from the coating of the first frustum shaped cavity and the coating of the second frustum shaped cavity by dielectric material of the dielectric body.
3 more elements
An electrical device, comprising:
- a radio subsystem;
- a processor coupled to the radio subsystem;
- and
- a bicone antenna coupled to the radio subsystem, the bicone antenna comprising:
- a dielectric body having an upper portion, a lower portion, and a central portion coaxial with the upper portion and lower portion and located between the upper portion and the lower portion;
- a first frustum shaped cavity formed in the upper portion of the body with the apex of the first frustum shaped cavity adjacent to the central portion, wherein the first frustum shaped cavity is coated with a first conducting material and is connectable to an antenna feed element;
- a second frustum shaped cavity formed in the lower portion of the body with the apex of the second frustum shaped cavity adjacent to the central portion, wherein the second frustum shaped cavity is coated with a second conducting material and is connectable to a ground element;
- a cylindrical cavity formed in the central portion, the cylindrical cavity connecting the apex of the first frustum shaped cavity and the apex of the second frustum shaped cavity, the cylindrical cavity lacking a coating of conducting material and having a cross-sectional area sufficient to receive the antenna feed element;
- and
- a parasitic element encircling the central portion and comprising a band of a third conducting material, wherein the parasitic is separated from the coating of the first frustum shaped cavity and the coating of the second frustum shaped cavity by dielectric material of the dielectric body.
7 more elements
A method of signal reception or transmission, comprising:
- transmitting or receiving a signal using a bicone antenna, the bicone antenna comprising:
- a dielectric body having an upper portion, a lower portion, and a central portion coaxial with the upper portion and lower portion and located between the upper portion and the lower portion;
- a first frustum shaped cavity formed in the upper portion of the body with the apex of the first frustum shaped cavity adjacent to the central portion, wherein the first frustum shaped cavity is coated with a first conducting material and is connectable to an antenna feed element;
- a second frustum shaped cavity formed in the lower portion of the body with the apex of the second frustum shaped cavity adjacent to the central portion, wherein the second frustum shaped cavity is coated with a second conducting material and is connectable to a ground element;
- a cylindrical cavity formed in the central portion, the cylindrical cavity connecting the apex of the first frustum shaped cavity and the apex of the second frustum shaped cavity, the cylindrical cavity lacking a coating of conducting material and having a cross-sectional area sufficient to receive the antenna feed element;
- and
- a parasitic element encircling the central portion and comprising a band of a third conducting material, wherein the parasitic is separated from the coating of the first frustum shaped cavity and the coating of the second frustum shaped cavity by dielectric material of the dielectric body.
4 more elements
Dependencies are inferred from the claim text.