Power versatile satellite transmitter
AssigneeSpar Aerospace Limited
InventorsJohn Zacharatos, Robert B. Williamson
Life of this patent
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Abstract
A communications satellite has several radiating elements connected respectively to the output ports of a hybrid matrix power amplifier the input ports of which are connected to respective output ports of a low level beam forming network. The low level beam forming network has input ports to which are applied individual beam signals and these are combined within the network to provide at the network output ports different component sums of the input signals. By selecting appropriate connections between the beam forming network and the hybrid matrix power amplifier on the one hand and between the hybrid matrix power amplifier and the radiating elements on the other hand, desired beam overlap and equal power amplifier loading can be achieved.
Claims11
An overlapping beam, power versatile system for a communications satellite comprising a low level beam forming network having inputs to which a plurality of individual beam signals are respectively applied, the beam forming network having a plurality of outputs, some of which respectively carry the sum of components of more than one input signal, a hybrid matrix power amplifier having input ports respectively connected to the outputs of the low level beam forming network and having complementary output ports respectively connected to a plurality of radiating elements of the same number as the outputs of the beam forming network, the manner in which the beam signals are combined within the beam forming network, the connections between the outputs of the beam forming network and the input ports of the hybrid matrix power amplifier and the connections between the output ports of the hybrid matrix power amplifier and the radiating elements being determined to achieve substantially equal power amplifier loading and to achieve beam overlap.
An overlapping beam, power versatile system for a communications satellite comprising a parabolic reflector having a focal point, a plurality of radiating positions proximate the focal point, at least one radiating element located at each radiating position, a low level beam forming network having inputs to which a plurality of individual beam signals are respectively applied, the beam forming network having a plurality of outputs of the same number as the radiating positions some of which outputs respectively carry the sum of components of more than one input signal, a hybrid matrix power amplifier having input ports respectively connected to the outputs of the low level beam forming network and having complementary output ports respectively connected to the at least one radiating element at the radiating positions, the selection of which output ports of the hybrid matrix power amplifier are connected to which radiating elements being determined in associated with the manner in which the beam signals are combined within the beam forming network and in association with which output ports of the beam forming network are connected to which input ports of the hybrid matrix amplifier so as to achieve substantially equal power amplifier loading and to achieve beam overlap.
Dependencies are inferred from the claim text.