Abstract: A wideband antenna with backlobe elimination in a confined space is disclosed. Backlobe elimination is by an array of electromagnetically conductive members disposed between the spiral element and the ground plane and almost contacting the ground plane so as to bleed a backlobe away from the spiral antenna to the ground plane. In one embodiment, the members are conical elements disposed between the spiral element and the ground plane of a spiral antenna such that the apexes of the conical elements almost contact the spiral element and the bases of the conical elements contact the ground plane. In some embodiments, other means may be employed to perform this function. In operation, conical elements bleed the backlobe of the signal away from the spiral element to the ground plane.

Abstract: A technique for suppressing backwaves employs a photonic approach. In one aspect, the technique includes an apparatus, including: a radiating element; and a microwave-photonic device for suppressing backwaves from the radiating element. In a second aspect, the technique includes a method for removing unwanted radiation from a radiating device, comprising: receiving unwanted radiation from the radiating device; communicating the received radiation to an electro-optically active material; communicating laser light to the electro-optically active material; communicating electromagnetic products of interactions between the radiation and the laser light to a photodiode; and communicating photodiode outputs to a termination.

Abstract: In a first aspect, the invention includes a radio frequency photonic transceiver, comprising: a radio frequency receiver; a radio frequency photonic transmitter; and a switch between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter. In a second aspect, the invention includes an apparatus, comprising: a radio frequency photonic receiver; a radio frequency photonic transmitter; and a switch between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter. In a third aspect, the invention includes a radio frequency, photonic transceiver, comprising: means for generating a radio frequency modulated optical signal; a radio frequency photonic transmitter; and means for switching between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter.

Abstract: In a first aspect, the invention includes a radio frequency photonic transceiver, comprising: a radio frequency receiver; a radio frequency photonic transmitter; and a switch between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter. In a second aspect, the invention includes an apparatus, comprising: a radio frequency photonic receiver; a radio frequency photonic transmitter; and a switch between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter. In a third aspect, the invention includes a radio frequency, photonic transceiver, comprising: means for generating a radio frequency modulated optical signal; a radio frequency photonic transmitter; and means for switching between the input of the radio frequency photonic receiver and the output of the radio frequency photonic transmitter.

Abstract: A plasmonic antenna feed and coupling device is disclosed that can include an antenna and a waveguide operatively coupled to the antenna. Surface plasmon polaritons generated on a surface of the antenna can be guided in a plasmonic state from the antenna through the waveguide. A method of plasmonic field guidance can include generating surface plasmon polaritons on a surface of an antenna, guiding the surface plasmon polaritons in a plasmonic state from the antenna to a waveguide and coupling the surface plasmon polaritons in a plasmonic state to a port.