Pretensioned backplane for tensioned membrane

An improved design for providing tension to a membrane that reflects, radiates or is a receiver of electromagnetic energy, comprising

• a pretensioned backplane with 3 or more planar edges that form the primary supporting structure and provide tension to the attached membrane,
• a periphery stiffening edge channel to maintain planar alignment along each planar edge that define the membrane plane,
• a corner alignment device at each corner to maintain alignment of the planar edges at each corner,
• a torsion plate or plurality of torsion plates shaped to provide additional stiffness and even tensioning on each planar edge,
• a mounting plate to provide a structural mounting interface to a host device,
• a means to secure backplane, torsion plate, and mounting plate together to form a rigid supporting structure that interfaces to a host device,
• a means to miter, shape or form each corner of the backplane to provide clearance when the backplane is pretensioned,
• a means to pretension the backplane assembly for the purpose of attaching or detaching the membrane or a plurality of membranes,
• a means to pretension the backplane assembly to store potential energy that is used to maintain tension on the attached membrane or a plurality of membranes,
• a nonporous reflective, transmissive, translucent or opaque membrane or a plurality of membranes attached to the pretensioned backplane,
• a means to attach the said membrane or a plurality of membranes at the periphery to the associated edge channels.