Patent ID: 7394435

Claim:
An antenna having defined a top, a bottom, and a central longitudinal axis, the antenna comprising: an outer section of electrically conductive material which is coaxial with the longitudinal axis, wherein said outer section includes an outer side wall extending from the bottom to join an outer top wall at the top of the antenna; an inner section of electrically conductive material which is also coaxial with the longitudinal axis, wherein said inner section includes an inner side wall extending from the bottom to join an inner top wall; said outer section and said inner section defining an interior region there between that is filled with dielectric material; said outer section having at least one slotted opening with opposed slot ends, wherein each said slotted opening extends from one said opposed slot end in said outer side wall, across said outer top wall, and to another said opposed slot end in said outer side wall; and said inner section including at least one feed to convey electromagnetic energy into or out of said interior region of the antenna.