Endgate LLC

Cisco Technology, Inc.

John R Sanford

James A Wilfong

Raymond R Blasing

Ian L Sayers

Mark Duncan Brinkerhoff

William Comisky

Ahmed A Kishk

An air cooled transceiver enclosure which includes multiple cooling posts about the enclosure. The transmitter and receiver antennas are planar mounted above the cooling posts and the cooling posts are selected so as not to interfere with the radiation and form part of the ground plane. The cooling posts are, in general, of a height which is less than one-quarter the wave length of the frequencies to be used. In accordance with another feature of the present invention, the transceiver base unit with cooling posts and mounted antennas has an easily attachable cover which is removably engaged to the transceiver base unit and offset from the planar antennas which lie above the base unit. In accordance with another feature of the invention, the transceiver base unit with cooling posts and mounted antennas has an easily attachable cover which is removably engaged to the transceiver base unit and offset from the planer antennas which lie above the base unit.

Transceiver unit

A trough waveguide antenna that has a septum and opposing bases and side walls. In one embodiment, the bases are undulated and asymmetrically disposed about the septum. The magnitude, periodicity and length, etc., of the undulations may be varied for performance. The configuration of the septum may be similarly varied. Other mechanisms for achieving energy radiation are also disclosed as are cost effective fabrication techniques.

Beam modifying trough waveguide antenna

A transition is provided for interfacing a coplanar waveguide with a three dimensional microwave waveguide. The transition includes three coplanar conductors that are formed integrally with and extend from the coplanar waveguide. The transition extends into the microwave waveguide through a slot, with the plane of the transition being perpendicular to the direction of propagation of the electric field in the waveguide. The center conductor of the transition is a patch whose width increases. The other two conductors are attached to the side conductors of the coplanar waveguide and to the exterior of the waveguide. They flank the patch and have curved edges complementary to those of the patch. The gaps are initially narrow, and become wider gradually. Further, as each guide steers the electric field while changing direction by 90.degree., it rotates the orientation of the electric field vector by the same amount.

Transition between circuit transmission line and microwave waveguide

An improved reflector antenna with far improved return loss than prior art subreflector antennas is disclosed herein. The invention uses a circular waveguide antenna feed employing a non-planar, subreflector having a radial cavity which reflects the energy from the waveguide onto a rotationally symmetrical main reflector. The dimensions of the feed tube, the subflector, and the connection between them are chosen to make the total reflection back into the feed tube very close to zero. The dimensions of the antenna feed are also chosen such that its radiation pattern has an amplitude null along the antenna feed axis. This further improves return loss by minimizing the amount of energy from the main reflector that gets directed back into the feed tube. An alternate embodiment features a feed radiation pattern with an asymmetric amplitude taper for improvement of the sidelobe envelope in a preferred plane.

Reflector antenna with improved return loss

An improved subreflector antenna with lower sidelobes than prior art subreflector antennas is disclosed herein. A tapered, anisotropic, corrugated subreflector is attached to a waveguide and located at the focus of a near-parabolic deep dish main reflector. The subreflector has corrugations of varying depth. The varying depths of the corrugations result in varying reactance, or reactance taper, of the subreflector. This taper is designed in such a manner to guide or steer the energy from the antenna feed to the main reflector in such a manner as to help assure sharply reduced sidelobes. Further, the subreflector is physically shaped so as to further steer or guide the energy in the desired direction. The deep geometry of the main reflector allows the reduced sized subreflector to be positioned within the rim of the main reflector such that the combination can be covered by a flat radome.

Low sidelobe reflector antenna system employing a corrugated subreflector

A flared trough waveguide antenna capable of being used at high microwave and millimeter wave frequencies is disclosed herein. The antenna includes a conductive trough having first and second ends, a bottom surface, and first and second opposing side surfaces electrically coupled to the bottom surface. A conductive fin is electrically coupled to the bottom surface between the first and second opposing side surfaces. The bottom surface includes a first planar portion between the conductive fin and the first side surface, and a second planar portion between the conductive fin and the second side surface. The conductive trough may be induced to radiate electromagnetic energy by introducing an offset between the first and second planar portions with respect to the plane of the conductive fin. The antenna further includes first and second flared surfaces, respectively coupled to the first and second side surfaces, for directing electromagnetic energy radiated by the flared trough waveguide antenna. The first and second flared surfaces each optionally define a plurality of corrugations for attenuating sidelobes of the radiated electromagnetic beam pattern. A planar array may be realized by placing a plurality of flared trough waveguide antennas adjacent each other. Each antenna within the array includes first and second planar bottom portions arranged asymmetrically relative to the vertical plane of a conductive fin therebetween. Electromagnetic energy is coupled into one end of each of the antennas within the array by way of a feed system.

Flared trough waveguide antenna

An antenna base has a holding structure for installing an antenna directly thereon. The base also has a base plate with an axis perpendicular to the axis of an installed antenna. An antenna mounting plate is suitable for having the base plate affixed to it. The antenna mounting plate is supported relative to a pole clamp by a spherical shell. The mounting plate, exposed through an opening in the shell, is supported for rotating about a horizontal axis passing through the plate to provide for elevation angle adjustment. Locking screws are used to secure the adjusted elevation angle. The pole clamp has a pair of axially spaced tracks that define an arcuate path that extends circumferentially around at least a portion of the clamp. The shell is held in position adjacent to the clamp by two pairs of guide elements in a way that allows the shell to move along the arcuate path. An adjustment screw is used to adjust the position of the shell along the arcuate path, thereby adjusting the azimuth of the antenna about a vertical axis. Locking screws are used to secure the adjusted azimuth orientation.

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Palo Alto, CA, United States of America

John R Sanford