Space Systems/loral, LLC

Levent Ersoy

Sina Barkeshli

Peter W Lord

Evert C Nygren

Vito J Jakstys

Rajan P Parrikar

Alan R Cherrette

Michael S Davis

Joel Varney

A Ka-band horn for transmitting and receiving information between a ground station and a satelitte includes three sections. The throat segment of the horn is adapted for coupling to a feed and includes circular, alternating grooves and webs that are of a widening type created by linearly increasing the width of the grooves in the direction of the horn's aperture. The throat corrugations are for matching the impedance of adjacent sections of the horn. A middle segment includes an up-angle flare section and a down-angle flare section each having dual depth corrugations that enable the horn to achieve a near-HE11 mode at the aperture of the horn. The final segment of the horn is a truncated, smooth-walled, cone.

Hybrid horn for dual Ka-band communications

An automatic network analyzer that measures continuous wave radio microwave driven transfer characteristics of nonlinear devices and simultaneously calculates and displays corresponding noise driven transfer characteristics and noise power ratio data. This automatic network analyzer employs software or firmware that uses closed-form equations to exactly calculate noise parameters. This is done in real-time as CW measurements are taken.

Automatic network analyzer having noise/NPR test capability

An antenna has one feed for an S-band electromagnetic signal, and a second feed constructed as an array of radiators to service two C-band signal channels. A subreflector having a microwave frequency selective surface (FSS) is placed in front of a main reflector. The C-band feed is constructed of an array of square aperture horns joined by separate transmit and receive barline beam-forming networks, and a meanderline polarizer to produce circularly polarized radiation patterns. Tapered ridges extend longitudinally along inner wall surfaces of each of the horns to provide increased bandwidth to the C-band feed. The frequency selective surface is constructed, typically, of a generally planar substrate of material transparent to electromagnetic radiation, and numerous metallic, generally annular, radiating elements, or resonators, arranged on the substrate in an array of repeating nested sets of the radiating elements. The lower frequency S-band feed is located behind and to the side of the subreflector for transmission of radiation via a folded optical path to the main reflector. The C-band feed is located in front of and to the side of the subreflector for transmission of radiation along a straight path through the FSS to the main reflector. The locating of the two feeds to the side of the subreflector permits the subreflector to be stowed by folding down upon the C-band feed, and the main reflector to be stowed by folding down upon both the S-band feed and the stowed subreflector.

Multiple band folding antenna

Growing community of inventors

Cupertino, CA, United States of America

Levent Ersoy