USA As Represented by Secretary of the Navy

Bruce Daniel Calder

Hale Bradford Simonds

Robbi Mangra

Dennis G Bermeo

Rob Horner

Rod Cozad

Rolf N Dahle

David W Brock

Peter Stuart Berens

Terence R Albert

Leon Yong Lin

Robert S Homer

Patrick Albert Groves

Steve Edward Mancewicz

A broadband antenna can include a parabolic dish having a diameter D and a radius of curvature that establishes a focal point for the parabolic dish. A tapered slot feed having a feed point can be positioned above the parabolic dish so that its effective radiation point is spaced a distance F from the center of the dish, where F is the focal length of the dish. With this configuration, feed point for the tapered slot feed can be coincident with parabolic dish focal point. The tapered slot feed can include two elements that form an exponentially tapered slot, which establishes a phase center for the tapered slot feed. A conductive bar can interconnect the two elements, in order to minimize the phase center variation during broadband operation.

High gain dish antenna with a tapered slot feed

An antenna includes a support structure and radiating element. The radiating element includes a dielectric planar substrate having a first and a second surface, at least two conductive spiral arms extending outward from and spiraling about an axis of rotation formed on the first surface, and a feed conductor extending outward from and spiraling about an axis of rotation formed on the second surface. The feed conductor may be substantially aligned with one of the conductive spiral arms. When the support structure is placed upon a substantially planar surface, the radiating element is positioned at height h from the planar surface, wherein height h is about one-fourth the wavelength of the antenna's operating frequency. The antenna may produce an omni-directional antenna pattern in azimuth and a broad antenna pattern in elevation, with both patterns having nulls near the horizon. An external reflector may be operatively coupled to the antenna.

Passive wide-band low-elevation nulling antenna

A Tapered Slot Antenna Cylindrical Array (NC#98219). The method includes coupling at least two tapered slot antenna pairs to a base element in a cylindrical configuration. The method may further include coupling a transmitter/receiver to each tapered slot antenna of the at least two tapered slot antenna pairs via radio frequency links. In addition, the method may further include coupling a microprocessor to the transmitter/receiver via communication links.

Tapered slot antenna cylindrical array

A Tapered Slot Antenna Cylindrical Array (NC#97194). The apparatus includes a base and a tapered slot antenna array. The base is capable of retaining a plurality of tapered slot antenna pairs. The tapered slot antenna array is operatively coupled to the base in a cylindrical configuration. The tapered slot antenna array comprises at least two tapered slot antenna pairs. Each tapered slot antenna pair of the at least two tapered slot antenna pairs is capable of operating independently of or in conjunction with other tapered slot antenna pairs of the at least two tapered slot antenna pairs to enable direction finding, acquisition, communication and electronic attack capabilities.

An improved tapered slot antenna. The structure includes a first antenna element, a second antenna element, a brace, a semi-infinite balun and a radome. The first and second antenna elements are operatively coupled to the brace in a tapered slot antenna configuration. The first and second input feed of the semi-infinite balun are operatively coupled to the first and second antenna elements, respectively, so that the second input feed is situated along substantially an entire length of a feed channel of the second antenna element. The radome is operatively coupled to the first and second antenna elements. A method for fabricating improved tapered slot antennas is also described.

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San Diego, CA, United States of America

Bruce Daniel Calder