USA As Represented by Secretary of the Navy

Nazia Mozaffar

Frederick Joseph Verd

John Harold Meloling

Daniel W S Tam

Justin A Church

Lu Xu

David Earl Hurdsman

Tiaotiao Xie

A method for reducing a quantity of cable runs to antennas can include the step of providing a circuit of reactive elements coupled between an input terminal and at least two output terminals. The circuit can be used to separate a broadband signal into two or more disjoint expected frequency ranges. The circuit can match the impedance at the at least two output terminals to the impedance expected by the antennas. The elements of the circuit can have reactances and arrangement so that when a broadband RF signal is applied at the input terminal, two or more disjoint expected frequencies can be applied to the respective output terminals. The power at each output terminal can sufficiently match the antennas' expected power, and insertion losses can be minimized.

N-channel high-power RF multiplexer

An antenna comprising: a solar collector; two conductive, orthogonal half-loops mounted to the solar collector such that the solar collector functions as a ground; an RF power source configured to feed RF power to each of the two half-loops having a 90-degree phase difference relative to each other; and a conductive cage structure surrounding the two half-loops, wherein the cage structure includes a conductive ring disposed above the center section, the conductive ring having an equilateral cross of conductive material disposed within the ring and supported by leg structures which are in electrically-conductive contact with the solar collector, and wherein each leg structure has attached thereto a non-Foster circuit having a negative impedance, wherein the non-Foster circuits are configured to actively load the cage structure such that the cage structure functions as an active, internal matching network for the antenna.

Broadband circularly polarized antenna incorporating non-Foster active loading

A dual feed slot antenna can include a ground plane formed with an aperture, and first feed and second feeds extending into the aperture. The first feed and second feed can extend into the aperture so that the first feed and second feed are coincident and out of phase with other. The first feed and said second feed can define a U-shaped stub, with a respective stub length, a stub width, a crossbar and a pair of stub tines defining a stub separation extending from the crossbar. The first feed and second feed can extend into the aperture so that each of the stub tines from a first feed are coincident the stub tines from the second feed. With this configuration, and with further selection of the said respective stub lengths, stub widths and stub separations, a symmetric omnidirectional radiation can be established for the antenna.

Dual feed slot antenna

Growing community of inventors

San Diego, CA, United States of America

Nazia Mozaffar