Raytheon Company

Michael J Maybell

George S Hardie

Steven T Wada

Robert Jobsky

Donald H Archer

Michael A Gilbert

Charles P Capps

Gary A Wideman

Arthur C Ludwig

Kenneth W Duncan

Raphael Hernandez

Robert H Loomis

An antenna capable of being mounted flush with variously shaped surfaces. The antenna comprises a dielectric filled radiating cavity with two opposing tapered walls. The radiating cavity is excited by a microstrip horn.

Flush mount antenna

An improved biconical horn antenna having a broad azimuthal beamwidth and an asymmetrical elevation beam pattern. The antenna comprises two conical sections mounted against a grounded backplane with the tapered ends of the sections facing each other. The sections are of unequal size and have curved edges. The antenna is fed by a rectangular waveguide passing through the backplane between the tapered ends of the sections.

Asymmetrical biconical horn antenna

A reflector type radio frequency antenna having: a feed for producing a difference radiation pattern with a cone-shaped null region; and, a reflector having a surface disposed to reflect a portion of the energy in the difference radiation pattern and having the edge disposed in the cone-shaped null region. With such arrangement, since the edge of the reflector is disposed in the null region of the difference radiation pattern such edge is not radiated with energy which could otherwise illuminate such edge, scatter, and thereby generate unwanted side lobes in the free space antenna pattern.

Radio frequency antenna having a reflector with an edge in a pattern

An antenna system is provided for producing a plurality of differently directed beams of electromagnetic energy, each one of such beams being associated with a corresponding one of a plurality of beam ports, each one of such beams being produced from a common array of antenna elements. The antenna system includes a radar frequency energy lens assembly having a plurality of array ports coupled to the plurality of antenna elements. The lens assembly includes a radio frequency lens having a plurality of lens ports disposed about peripheral portions thereof. Each one of a first portion of such plurality of lens ports is coupled to a corresponding one of the antenna elements through a corresponding one of the array ports and each one of a second, opposing portion of the plurality of lens ports being coupled to a corresponding one of the beam ports. Each one of the lens ports in one of the portions thereof includes a pair of tapered feeds. A power divider/combiner is provided for each one of the pair of tapered feeds, such power divider/combiner having a pair of branch lines coupled to the pair of tapered feeds and a common line coupled to the one of the beam ports or array ports coupled to such lens port. The electrical lengths between an input to the common line and the outputs of the pair of tapered feeds coupled to the branch lines of such power divider/combiner are equal.

Parallel plate lens antenna

A multibeam antenna having a radio frequency lens fed by a plurality of feedports is disclosed. The radio frequency lens includes a printed circuit parallel plate region and a polarizer section. The polarizer section includes a plurality of polarizer sheets separated by a plurality of layers of dielectric material, the dielectric constant of the printed circuit parallel plate region and the dielectric constant of the layers of dielectric material being selected to form substantially collimated beams, each one of such beams being associated with a corresponding one of the feedports. With this arrangement, the polarizer section is an integral part of the radio frequency lens, thereby reducing the size of the antenna.

Radio frequency antenna with combined lens and polarizer

A radio frequency antenna having a microstrip feed network and a flared radiating structure directly fed by such microstrip feed network. A wedge-shaped dielectric structure is disposed in the narrow region of the flared radiating structure to match the impedance of the antenna to the impedance of free space. An E-plane array antenna includes a plurality of antenna elements, each including a single feed element on a dielectric board. An H-plane array antenna includes a plurality of feed elements on a single dielectric board. A cover, having an absorbing material, is disposed over the microstrip feed network to suppress stray radiation from propagating from such feed network.

Growing community of inventors

Santa Barbara, CA, United States of America

Michael J Maybell