USA as Represented by Secretary of the Navy

Other

Thinh Q Ho

Stephen M Hart

Willard I Henry

John W Rockway

James C Logan

Kevin Allen

Gregory A Kosinovsky

Richard C Adams

Charles A Hewett

Will Henry

A system may include one or more transmitter processing modules each having at least one of a plurality of modulation elements arranged in parallel. Each modulation element may be configured to modulate a respective baseband data signal at a different rate than other modulation elements. The system may include one or more receiver processing modules each having a plurality of demodulation elements arranged in parallel. Each demodulation element may be configured to demodulate a respective baseband data signal at a different rate than other demodulation elements. The system may include a first antenna for transmitting signals and a second antenna for receiving signals. One or more isolation systems may be used to actively cancel electromagnetic interference received by the receiving antenna from the transmitting antenna.

Multi-spectrum high data rate communications system with electromagnetic interference cancellation

A compensation apparatus for an integrated communication system is disclosed. The integrated communication system can include a first communication device having a first transmitter antenna, and a second communication device having a second receiver antenna, wherein the second receiver antenna is in appreciable proximity of the first transmitter antenna such that the second receiver antenna picks up substantial electromagnetic interference from the first communication device. The compensation apparatus can include an isolation device having compensation circuitry coupling the first transmitter antenna and the second receiver antenna and configured to adaptively cancel the electromagnetic interference from the first communication device at the second receiver antenna.

High isolation multiple carrier system architecture for communications

A frequency agile collocated multi-signal rf distribution system. The system includes a plurality of receivers, a plurality of transmitters, a power amplification module, an antenna module and an interference reduction module. The power amplification module is operatively coupled to the plurality of transmitters and is capable of receiving and amplifying transmission signals, reducing interference and outputting amplified transmission signals. The antenna module is operatively coupled to the power amplification module and is capable of receiving amplified transmission signals, receiving reception signals and outputting reception signals. The interference reduction module is operatively coupled to the power amplification module, the antenna module and the plurality of receivers, and is capable of receiving amplified transmission signals and reception signals, reducing co-site interference in receptions signals, and outputting reception signals having reduced co-site interference to the plurality of receivers. A method for implementing a frequency agile collocated multi-signal rf distribution system is also described.

Frequency agile-collocated multi-signal RF distribution system

A method and apparatus for a multiband frequency distributed circuit apparatus with FSS. The apparatus includes a circuit, a first dielectric layer, a first FSS layer, a second layer and a ground plane. The first dielectric layer is operatively coupled to the circuit. The first FSS layer is operatively coupled to the first dielectric layer and is capable of passing a first frequency band. The second layer is operatively coupled to the first FSS layer and includes a dielectric material. The ground plane is operatively coupled to the second layer. A method for implementing a multiband frequency distributed circuit is also disclosed.

Method and apparatus for multiband frequency distributed circuit with FSS

An antenna system includes: a) a ground plane; b) an array of antennas affixed to the ground plane, wherein each antenna element includes a stack of antenna elements; c) a dielectric spacer affixed to the array of antennas, and e) a frequency selective surface affixed to the dielectric spacer. Each antenna element includes a radio frequency element affixed to a dielectric layer.

Low observable multi-band antenna system

An integrated circuit multiplexer comprises a waveguide having an interior cavity, first RF input port, and a first and second output ports; a dielectric structure positioned in the cavity; an RF input feed attached to the dielectric structure that extends through the RF input port; a first RF output feed attached to the dielectric structure that extends through the first RF output port; a second RF output feed attached to the dielectric structure that extends through the second RF output port; a first resonator pair mounted to the dielectric structure between the RF input feed and the first RF output feed, and electrically connected to the waveguide; and a second resonator pair mounted to the dielectric structure between the RF input feed and the second RF output feed, and electrically connected to the waveguide so that the first and second resonator pairs are generally coplanar. The waveguide is shaped as a right rectangular prism having a rectangular cross-sectional area characterized by a width L and a depth L , where L <(0.5)&lgr;, L <(0.25)&lgr;, and &lgr; represents the center wavelength of a radio frequency signal that is input into said waveguide so that the waveguide operates in an evanescent mode in response to receiving the radio frequency signal.

High rejection evanescent MIC multiplexers for multifunctional systems

A wideband antenna system comprises a stack of m antennas, where m is a positive integer, and m&gE;2. Each antenna includes: a) an electrically insulating substrate; b) opposed first and second radio frequency elements mounted to the substrate; c) a ground feed electrically connected to the first radio frequency element; d) an excitation feed electrically connected to the second radio frequency element; and e) a ground plane mounted to the substrate of the m antenna. The radio frequency elements of each antenna collectively have a unique total area and are mounted to the electrically insulating substrate. The radio frequency elements of the i antenna provide a ground plane for the k antenna, where i and k are positive integers, 1&lE;k&lE;(i&minus;1), and 2&lE;i&lE;m. The total area of the first and second radio frequency elements of the i antenna is greater than the total area of the first and second radio frequency elements of the k antenna.

Wideband antenna system

A matched pair circulator antenna isolation circuit provides isolation between an antenna and one or more receivers and transmitters and may also be applied to other RF devices. A portion of the transmit signal is extracted by a first RF circulator and divided into two phase-inverted signals. The first phase-inverted signal is coupled through a first directional coupler to cancel most of the transmit signal present in the receive signal. The second phase-inverted signal is coupled through a second directional coupler to cancel remaining transmit signal in the output of the first directional coupler. The output of the second directional coupler is coupled to the input of the receiver.

Matched pair circulator antenna isolation circuit

A wideband high isolation circulator network reduces or eliminate interfece from a nearby RF transmitted signal in a received RF signal. The network includes a first sampler for dividing a first signal into second and third signals; a circulator for receiving the second signal through a first port, for outputting a fourth signal and receiving a fifth signal through a second port, and for outputting a sixth signal through a third port which represents the vector sum of samples of the second and fifth signals; and a signal processing stage which generates a seventh signal having amplitude and phase characteristics representing the fifth signal in response to receiving the third and sixth signals.

System and method for isolating radio frequency signals

A wide band phased array antenna includes a radio frequency reflector hav a focal axis, and first and second sides and an m number of transverse electromagnetic transmission carriers, where each of the carriers includes a first conductor which generally transects the focal axis of the reflector and is electrically connected to a first side of the reflector, and a second conductor electrically connected to a second side of the reflector, where m is a positive integer. The RF reflector is located between the first and second conductors for guiding the beam.

Wide band tem fed phased array reflector antenna

A frequency selective surface integrated antenna is provided which compri a frequency selective surface, including an electrically non-conductive substrate and an electrically conductive layer, mounted to the substrate and having a pattern of apertures; and an antenna integrated in the frequency selective surface.

Frequency selective surface integrated antenna system

An isolation circulator network includes three circulators and a 180 degree ybrid coupler for isolating an RF transmitter from a nearby RF receiver. The isolation circulator network comprises: a first circulator for transforming a first RF signal, RF.sub.1, into a second RF signal, RF.sub.2 and a third RF signal, RF.sub.3 ; a second circulator for throughputting the third RF signal; a third circulator for transforming the second RF signal into a fourth RF signal, RF.sub.4, and a fifth RF signal, RF.sub.5, and for throughputting a sixth RF signal, RF.sub.6 ; and a 180-degree hybrid coupler which provides a seventh RF signal, RF.sub.7 in response to receiving the third, fifth, and sixth RF signals, where RF.sub.7 =(RF.sub.5 -RF.sub.3 +RF.sub.6).

Wideband high isolation circulatior network

An omni-directional antenna is provided which comprises: 1) a first prolate spheroid having an electrically conductive first outer surface and a first center axis, 2) a second prolate spheroid having an electrically conductive second outer surface and a second center axis, 3) a structural member for supporting the first prolate spheroid a fixed distance from the second prolate spheroid so that the first and second center axes are coincident, 4) a first resistive ring mounted to the surface of the first prolate spheroid; 5) a second resistive ring mounted to the surface of the second prolate spheroid; and 5) a coaxial cable having an outer conductor electrically connected to the second surface of the second prolate spheroid and a center conductor electrically connected to the first surface of the first prolate spheroid.

Wideband omni-directional antenna

A broadband coplanar waveguide to slotline transition for transferring radio frequency energy having a wavelength, .lambda., comprises: 1) a dielectric substrate having a first planar surface; an electrically conductive layer formed on the first planar surface; 2) a coplanar waveguide including: a) a center conductor defined by a section of the electrically conductive layer bordered by first and second parallel channels formed in the electrically conductive layer so as to expose the dielectric substrate; b) a first ground plane defined by a section of the electrically conductive layer bordering the first channel; and c) a second ground plane defined by a section of the electrically conductive layer bordering the second channel; 3) a slot cavity formed in the electrically conductive layer so as to expose an area of the dielectric substrate, the slot cavity coextensive with the first channel and having a periphery such that the length of a line segment intersecting two points of the periphery and a centroid of the area is approximately .lambda./4; and 3) a slotline defined by a third channel formed in the electrically conductive layer which is coextensive with the second channel.

Broadband coplanar waveguide to slotline transition having a slot cavity

A uniplanar microstrip to slotline transition is provided which includes a ubstrate having opposed first and second sides. A first electrically conductive layer is joined to the first side of the insulating substrate; and a second electrically conductive layer is joined to the second side of the substrate. The second layer is configured to provide a microstrip, a microstrip transmission mode to slotline transmission mode transition having a matching element, and a slotline.

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Anaheim, CA, United States of America

Thinh Q Ho