A satellite system includes directional antenna with a gain pattern response having nulls where interfering adjacent satellite signals would be received. Using an electronically scanned array (ESA), sub-arrays of the ESA sample interfering adjacent satellite signals and then filter the sampled signals from the primary single received by the ESA. Digital signal processing increases the accuracy of the filtering process by analyzing the interfering adjacent satellite signal to determine the angle-of-arrival of the signal.

A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.

A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.

A beamformer comprises a transmission line fed by at least one input feed source, the transmission line comprising two stacked metal plates extending, along two directions, longitudinal X and transverse Y. The transmission line further comprises at least one protuberance extending in the directions X, Y, and in a direction Z orthogonal to the plane XY, the protuberance comprising a metal insert extending in the directions X and Y and extending height-wise in the direction Z, the insert comprising a base fastened to one of the two metal plates and a free end and having a contour of variable length between the two lateral edges of the transmission line. In the protuberance, the transmission line is adjoining the insert and forms, in the direction Z, a circumvolution around the insert.

Reconfigurable RF front-end circuit for a multi-beam array fed reflector antenna system having a first plurality of N.sub.B input beam signals and a second plurality of N.sub.E radiating elements (RE), and method of operating such a front-end circuit.

The front-end circuit comprises a reconfigurable beam forming network (LLRBFN), having a set of N.sub.B input ports and distributing each input port signal to a plurality of N.sub.A output ports with phase and amplitude control, a plurality of N.sub.A high power amplifiers (HPA) connected to the plurality of N.sub.A output ports of the reconfigurable beam forming network (LLRBFN) and an output network (ONET, OSN), arranged for recombining signals output by the high power amplifiers (HPA) and feeding the recombined signals to the second plurality of N.sub.E radiating elements (RE). The high power amplifiers (HPA) are variable bias high power amplifiers (VB-HPA).

A system may include a digital beam forming (DBF) antenna array including antenna radiating elements including a first and second antenna radiating elements. The DBF antenna array may be configured to: simultaneously transmit a set of calibration signals on multiple antenna radiating elements, the multiple antenna radiating elements including the first and second antenna radiating elements, each calibration signal of the set of calibration signals comprising a given timing acquisition sequence and a given second sequence, the given second sequence used to measure a phase and a gain of a given antenna radiating element; transmit a first calibration signal of the set by the first antenna radiating element; transmit a second calibration signal of the set by the second antenna radiating element; and calibrate the multiple antenna radiating elements by using an estimated relative phase and an estimated relative gain for each of the multiple antenna radiating elements.

A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.

A quasi-optical beam former includes a set of beam ports, a set of network ports, a quasi-optical device and at least one parallel-plate waveguide extending between the beam ports and the network ports, the beam ports and/or the network ports being superposed in at least two stages, each of the at least two stages being separated by a conductive plane common to two adjacent stages, the quasi-optical beam former comprising a resistive film placed in the continuity of the conductive plane.

The multi-beam former comprises: two stages connected together and intended to synthesize beams focused along two directions in space; each stage comprises at least two multi-layer plane structures (P11, P1Ny), (P21, P2Mx), superposed one above the other; each multi-layer structure (P11, P1Ny, P21, P2Mx) comprises an internal reflector, at least two first internal sources disposed in front of the internal reflector and linked to two input/output ports (27, 26) aligned along an axis (V, V), at least two second internal sources disposed in a focal plane of the internal reflector and linked to two second input/output ports (25, 28) aligned along an axis (U, U) perpendicular to the axis (V, V); the two second internal sources of the same multi-layer structure (P11) of the first stage are respectively linked to two first internal sources of two different multi-layer structures (P21), (P2Mx) of the second stage.

A phase array antenna system includes a first panel comprising a first array of antennas in a first grid pattern for transmitting first signals, and a second panel comprising a second array of antennas in a second grid pattern for receiving second signals. The first panel and the second panel are fixedly disposed in a plane and co-located along a direction in in the plane. The first grid pattern is the same as the second grid pattern, and the first panel and the second panel are rotated by an angle.