Abstract: A collapsible ground plane for a mobile UHF satcom antenna mounted on a riser comprises a hub and a plurality of conductive members, some of which extend radially from the hub with additional conductive members that extend peripherally between adjacent distal ends of the radially extending conductive members. Each conductive member is flexible so as to yield upon an impact, and return to its original shape when the impact is relieved.

Abstract: A UHF satcom antenna comprises a hollow cylinder; an annular substrate disposed on a base of the hollow cylinder; a circular substrate coplanar and concentric to the annular substrate; a plurality of bow-tie antenna elements; a plurality of rectangular antenna elements and a plurality of open-sleeve elements. The antenna system includes at least one feed line extending through the hollow cylinder and the circular substrate and electrically connects to the bow-tie elements. The hollow cylinder may comprise a dielectric material. Provided on the annular substrate, the bow-tie elements extend radially outward from the center of the annular substrate. The rectangular elements are electrically coupled to the plurality of bow-tie antenna elements and are provided on the outer surface of the hollow cylinder. Provided on both the annular substrate and the outer surface of the hollow cylinder, the open-sleeve elements act as parasitic antenna elements for the bow-tie antenna system.

Abstract: A UHF satcom antenna comprises a hollow cylinder; an annular substrate disposed on a base of the hollow cylinder; a circular substrate coplanar and concentric to the annular substrate; a plurality of bow-tie antenna elements; a plurality of rectangular antenna elements and a plurality of open-sleeve elements. The antenna system includes at least one feed line extending through the hollow cylinder and the circular substrate and electrically connects to the bow-tie elements. The hollow cylinder may comprise a dielectric material. Provided on the annular substrate, the bow-tie elements extend radially outward from the center of the annular substrate. The rectangular elements are electrically coupled to the plurality of bow-tie antenna elements and are provided on the outer surface of the hollow cylinder. Provided on both the annular substrate and the outer surface of the hollow cylinder, the open-sleeve elements act as parasitic antenna elements for the bow-tie antenna system.

Abstract: A collapsible ground plane for a mobile UHF satcom antenna mounted on a riser comprises a hub and a plurality of conductive members, some of which extend radially from the hub with additional conductive members that extend peripherally between adjacent distal ends of the radially extending conductive members. Each conductive member is flexible so as to yield upon an impact, and return to its original shape when the impact is relieved.

Abstract: A one-piece multi-element directional Yagi-Uda antenna comprised of an array of director elements, a reflector element, boom and folded dipole driven element is fabricated from a single piece of conductive material. The method of forming the antenna uses simple, low-cost techniques, such as single and progressive die stamping, punching and forming. The dipole driven element of the antenna is formed by folding the ends of the driven element during the stamping process or in a separate folding step. In an alternative embodiment of the invention, the boom of the antenna array is formed with sufficient length to operatively connect a radome thereto.

Abstract: A one-piece multi-element directional Yagi-Uda antenna comprised of an array of director elements, a reflector element, boom and folded dipole driven element is fabricated from a single piece of conductive material. The method of forming the antenna uses simple, low-cost techniques, such as single and progressive die stamping, punching and forming. The dipole driven element of the antenna is formed by folding the ends of the driven element during the stamping process or in a separate folding step. In an alternative embodiment of the invention, the boom of the antenna array is formed with sufficient length to operatively connect a radome thereto.

Abstract: To provide broad bandwidth in a multiple-band directional antenna, the antenna includes an array of parallel horizontal elements, which are: (1) an open-sleeve dipole as the driven element; (2) a trap director element; and (3) trap reflector elements. The driven element includes: (1) a trap central dipole which is center-fed and has sections self-resonant within the bands of 21.0 to 21.45 megahertz and 14.0 to 14.35 megahertz; and (2) two unequal-length sleeves self-resonant at 28.0 to 29.7 megahertz. The director and reflector elements are resonant in the same bands and are spaced and tuned for directivity of the array.