Efficient satellite structure concept for single or stacking multiple launches

1. A system including a satellite structure and a dedicated Payload Attaching Fitting (PAF) for releasable attachment to said satellite structure, the satellite structure exclusively comprising an external load-carrying structure, said external load-carrying structure being configured to avail the entire internal volume of said satellite structure for equipment accommodation, wherein said external load-carrying structure includes external vertical planar panels having internal reinforcements or embedded structures or skin thickness reinforcements, each configured for exerting a structural reinforcement function of diagonal beams in a truss structure architecture,

wherein the satellite structure has a discrete number of interfaces configured for attachment to said dedicated PAF; and wherein the dedicated PAF is mountable on a bolted interface of the upper stage of a launch vehicle,

wherein the satellite structure has identical bottom and upper discrete number of interfaces configured to provide stacking of two or more satellites, and

wherein each of said interface comprises:

mechanical interfaces including a cup-cone interface connected at an edge of each corner beam;

at least one releasable bolt;

a system for spacecraft separation; and

a releasable electrical connector.

2. The system according to claim 1 , wherein interfaces between a satellite structure and the dedicated PAF, and/or between stacked satellite structures, are identical to each other and are each configured to be equipped with one or more electro-actuated separation devices according to local mechanical loads.

3. The system according to claim 1 , wherein said external load-carrying structure further comprises vertical beams and corner beams.

4. The system according to claim 1 , wherein the two or more satellites are identical.

5. The system according to claim 1 , wherein the two or more satellites are with different masses and heights.