Northrop Grumman Systems Corporation

Trw Limited

Gregory P Krishmar-Junker

Arun K Bhattacharyya

Philip W Hon

Dah-Weih Duan

Charles W Chandler

Vrage Minassian

Makkalon Em

Shih-En Shih

Loc B Chau

David I Stones

A flared feed horn including a plurality of signal lines deposited on a bottom surface of a substrate and forming part of a TEsum mode launcher, a ground plane deposited a top surface of the substrate, and an outer conductor electrically coupled to the ground plane and having an internal chamber, where the conductor includes a flared portion and a cylindrical portion. The outer conductor includes an opening opposite to the substrate defining an aperture of the feed horn. The feed horn also includes an embedded conductor positioned within the chamber and being coaxial with the outer conductor, where the embedded conductor is in electrical contact with the plurality of signal lines. The feed horn also includes a TEdifference mode launcher electrically coupled to the outer conductor proximate the aperture.

Compact wide band, flared horn antenna with launchers for generating circular polarized sum and difference patterns

A coaxial feed horn including a dielectric substrate having at least one microstrip feed line deposited on a bottom surface of the substrate and a ground plane deposited on a top surface of the substrate. A cylindrical outer conductor is electrically coupled to the ground plane and an embedded conductor is coaxially positioned within the outer conductor, where the embedded conductor is in electrical contact with the microstrip line. A dielectric member is positioned within the outer conductor and includes a tapered portion extending out of the outer conductor at the aperture. In one embodiment, the dielectric member is a plurality of dielectric layers each having a different dielectric constant, where a first dielectric layer allows for propagation of a TEsum mode and a last dielectric layer is positioned proximate the antenna aperture and allows for propagation of a TEdifference mode.

Excitation method of coaxial horn for wide bandwidth and circular polarization

An orthomode coupler ( ) for directing both satellite uplink and downlink signals. The coupler ( ) includes a waveguide structure ( ) having a first cylindrical section ( ), a conical section ( ) and a second cylindrical section ( ) providing a waveguide chamber ( ) therein. The conical section ( ) provides impedance matching of the downlink signal between the waveguide structure ( ) and a plurality of symmetrically disposed downlink waveguides ( ). The waveguides ( ) are positioned around the waveguide structure ( ) and are in signal communication with the waveguide chamber ( ) through openings in the tapered section ( ). Irises ( ) are provided at the connection between the downlink waveguides ( ) and the waveguide chamber ( ) for impedance matching purposes.

Symmetric orthomode coupler for cellular application

An antenna system that employs antenna elements for both transmit and receive functions. Signals received by each antenna element are directed to a dual band polarizer that converts the signals to linearly polarized signals, and signals to be transmitted by each antenna element are converted to circularly polarized signals by the polarizer. The orientation of the polarizer and whether the circularly polarized signals are LHCP or RHCP determines whether the linearly polarized signals are vertically or horizontally polarized. A dual-band orthomode transducer is employed to separate the receive and transmit signals into their respective frequency bands based on whether they are vertically or horizontally polarized. The transducer is a waveguide device having only three signal ports. A high pass filter is used to help separate the received signals, and a low pass filter is used to help separate the transmit signals.

Dual frequency single polarization feed network

Growing community of inventors

Redondo Beach, CA, United States of America

Gregory P Krishmar-Junker