Southwest Research Institute

Patrick J Siemsen

Charles K Baker

Ruell F Solberg, Jr

Charles H Parr

Steven P Saulnier

Ralph Riojas

Robert R King

Dayle D Winnie

An omnidirectional vertically polarized antenna. A number of antenna elements are each fabricated on a backing, such as a printed circuit board. The front of each antenna element has conductive strips and slots, arranged in an alternating pattern. The back of each antenna element has an antenna feed circuit. An electrically absorptive layer is attached to the back of each antenna element. The antenna elements are assembled together in a nonconductive housing with circumferentially arranged compartments that receive the antenna elements.

Cylindrical continuous-slot antenna made from discrete wrap-around antenna elements

An easily transportable multiband antenna array. The antenna array is fabricated on a multi-sided structure, such as a four-sided cube, made from a wire frame and fabric. The multi-sided structure is constructed so that it may be folded by first folding the faces against each other, and then twisting them to form a stack of loops. The antenna elements are fabricated on the faces, and comprise at least a loop antenna around the perimeter of each face, and a bow-tie antenna attached to each face. The antenna elements are fabricated and attached so that they do not inhibit the folding of the structure.

Portable pop-up direction finding antenna

A direction-finding antenna constructed from polymer composite materials which are electrically conductive is shown with the polymer composite materials replacing traditional metal materials. An inherent advantage of replacing metal materials is significantly lower radar reflectivity (radar cross section) and lower weight. The reduced radar reflectivity reduces the range of detectability of the antenna by possible adversaries. Despite significantly lower radar reflectivity, the antenna assembly has direction-finding characteristics which are essentially equivalent to traditional metal antennas.

Polymer, composite, direction-finding antenna

Growing community of inventors

Boerne, TX, United States of America

Patrick J Siemsen