Radiation pattern insulator and multiple antennae system thereof and communication device using the multiple antennae system

A radiation pattern insulator, comprising:

• a dielectric substrate, allocated between a plurality of antennae, wherein the dielectric substrate comprises a top surface and a bottom surface, and a normal direction of the dielectric substrate is substantially perpendicular to propagation directions of a plurality of electromagnetic waves radiated from the antennae;
• a plurality of uniplanar radiation pattern insulation elements, allocated on the top surface or the bottom surface of the dielectric substrate, wherein the uniplanar radiation pattern insulation elements are located in one plane and are not grounded;
• and
• a tree shape insulation element, allocated on a surface of the dielectric substrate opposite to the surface on which the uniplanar radiation pattern insulation elements are allocated.