Abstract: Various embodiments of the present disclosure provide an antenna system including a first set of receive antenna elements and a second set of transmit antenna elements. Each receive antenna element is paired with one of the transmit elements. Paired receive and transmit antenna elements point in the same azimuthal direction, and the receive antenna element feeds its paired transmit antenna element. Each receive antenna element and each transmit antenna element has a phase center, and the phase centers of the receive and transmit antenna elements are all positioned substantially along the same axis. The receive and transmit elements are arranged in a phase-conjugate configuration such that, for each pair of receive and transmit antenna elements, those receive and transmit antenna elements are altitudinally spaced substantially the same distance from a plane through the antenna system.

Abstract: Various embodiments of the present disclosure provide an antenna system including a first set of receive antenna elements and a second set of transmit antenna elements. Each receive antenna element is paired with one of the transmit elements. Paired receive and transmit antenna elements point in the same azimuthal direction, and the receive antenna element feeds its paired transmit antenna element. Each receive antenna element and each transmit antenna element has a phase center, and the phase centers of the receive and transmit antenna elements are all positioned substantially along the same axis. The receive and transmit elements are arranged in a phase-conjugate configuration such that, for each pair of receive and transmit antenna elements, those receive and transmit antenna elements are altitudinally spaced substantially the same distance from a plane through the antenna system.

Abstract: A structural beam assembly is for use in supporting a fabric covered building includes a plurality of adjacent beam sections in end-to-end alignment and a means for interconnecting the adjacent beam sections. Each beam section comprises an upper member, a lower member and a reinforcing web extending between and interconnecting the upper and lower members. According to one embodiment, the upper and lower members are tubular and the connection means comprises a connection bracket having an upper tubular member sized for insertion into the upper tubular members of a two adjacent beam sections and a lower tubular member sized for insertion into the lower members two adjacent beam sections. In another embodiment, the upper and lower members are tubular and the connection means comprises a swaged portion integrally formed on the upper tubular member of one of the two adjacent beam sections and a swaged portion integrally formed on the lower tubular member of one of the two adjacent beam sections.