Abstract: A support structure for a compact planar cooling device is presented. The support structure allows the cooling device to be made with a simpler structure than most conventional cooling devices. The cooling device includes a planar casing, a wick layer, and the support structure. The support structure includes a flat plate with a portion cut out to form an opening and a spacer on the flat plate. The spacer is made by bending or folding the cut-out portion of the plate. The spacer enhances coolant circulation inside the cooling device by pushing the wick layer against the inner surface of the casing and maintaining a set distance between the support structure and the casing to allow unimpeded coolant movement. The cooling device can be made cost-effectively without compromising heat transfer efficiency.