Patent ID: 7259721

Claim:
A reflecting board for a microstrip reflectarray antenna, comprising: a bottom substrate having a first lower surface, wherein a grounding plate is disposed on the first lower surface to ground the bottom substrate; and a top substrate having an upper surface, a second lower surface, plural first microstrip antenna patches, and plural second microstrip antenna patches, wherein the first microstrip antenna patches are disposed on the upper surface and the second microstrip antenna patches with rectangular slots are disposed on the second lower surface; wherein each second microstrip antenna patch on the second lower surface is located opposite to the corresponding first microstrip antenna patch on the upper surface of the top substrate, the ratio of the area of the first microstrip antenna patch to the area of the corresponding second microstrip antenna patch is identical for each first microstrip antenna patch on the upper surface of the top substrate, and the ratio of the maximum border-length of the rectangular slot to the maximum border-length of the corresponding second microstrip antenna patch is identical for each second microstrip antenna on the second lower surface of the top substrate.