Sperry Corporation

The Mitre Corporation

Basrur R Rao

Gerald F Ross

Eddie Nelson Rosario

Harry M Cronson

Mohamed Mahmoud

Prentis B Drew

Chris J Daigle

Edward N Rosario

Jeffrey Michael Elloian

Werner Lerchenmueller

An antenna system having reduced back radiation is disclosed. The antenna system includes an antenna and ground plane. The antenna includes electro-textiles and is configured to operate in at least the frequency range between 1.1-1.6 GHz. The ground plane includes electro-textiles and is configured to operate as a frequency selective surface with electronic band gap characteristics to suppress edge and curved surface diffraction effects. In this system, the antenna and ground plane are configured to be located on a curved surface and to radiate with a directional radiation pattern having attenuated back lobes.

Conformal electro-textile antenna and electronic band gap ground plane for suppression of back radiation from GPS antennas mounted on aircraft

Embodiments provide an integrated antenna system that enables dual-use operation (e.g., communications and navigation). In an embodiment, the integrated antenna system includes a sleeve monopole antenna system and stacked shorted annular ring (SAR) patch antenna system, which are compactly integrated to fit on a military handset or a smart phone. In an embodiment, the integrated antenna system enables communication in the 225-450 MHz Ultra-High Frequency (UHF) band and reception of various Global Navigation Satellite System (GNSS) bands.

Ultra-high frequency (UHF)-global positioning system (GPS) integrated antenna system for a handset

An antenna assembly includes a conducting ground plane, a single dielectric substrate layer or a plurality of dielectric substrate layers each with different dielectric constants mounted to the conducting ground plane. A central patch element is mounted to the dielectric substrate layer or layers and configured to radiate within a first frequency band. A plurality of probes (i) extend through the conducting ground plane and the dielectric substrate and (ii) are physically connected to the central patch element. A parasitic ring is disposed around the central patch element and reactively coupled thereto. The parasitic ring is configured to radiate within a second frequency band.

System for co-planar dual-band micro-strip patch antenna

A microwave phase shifter for use in waveguide transmission line employs a piezoelectric cantilevered bimorph member mounted on the waveguide and a thin wafer of dielectric material mounted on the free end of the cantilever above a slot in the waveguide. Voltages applied to the bimorph member cause this member to distort so as to insert the wafer into the waveguide slot and alter the phase of the microwave signal being transmitted.

Electrically controlled phase shifter

An improved dome antenna system wherein compensation for cross polarized signal components in a received difference pattern of the feed array of the system is accomplished with a second array cross polarized to the feed array. This second array is density tapered to establish an aperture distribution function that is substantially equal to the aperture distribution function of the feed array. Weighting factors, programmed as a function of the boresight scan angle, are applied to the output signals of this second array and the weighted signals are subtracted from the difference signals of the feed array.

Cross polarization compensation technique for a monopulse dome antenna

A baseband generator for pulses of high peak amplitude, rapid rise time, subnanosecond duration, and high pulse repetition frequency is disclosed. A plurality of capacitors are charged in parallel then discharged in series to cause a plurality of avalanche of transistors to fire sequentially. The resulting sum voltage across the capacitors is then applied to a step recovery diode to generate the pulse.

Short pulse generator

A surface wave transmission line enclosed in a dielectric shield and supported within the enclosure at a predetermined distance from the base of the enclosure. The enclosure being constructed such that the surface wave transmission line may be in close proximity to reflecting objects positioned along the enclosure and at a predetermined distance from a mounting structure.

Shielded surface wave transmission line

A collision avoidance system for rapid transit vehicles employing baseband radar principles in which signals with duration in the order of nanoseconds are transmitted down track along a surface wave transmission line. Reflections from a passive target located on the preceding vehicle are processed to establish the distance between the vehicles to within an accuracy previously unachievable.

Collision avoidance system using short pulse signal reflectometry

A continuous, self-supporting microwave transmission line along which ultra short pulses of microwave signals may propagate over distances of several hundred feet with minimum pulse distortion and signal attenuation. Propagation along the line is accomplished by an electromagnetic field thereabout that is sensitive to objects positioned in the proximity of the transmission line, a characteristic that may be utilized in short pulse reflectometer systems for monitoring and control of vehicles on a prescribed course.

Growing community of inventors

Lexington, MA, United States of America

Basrur R Rao