Modeling of printed antennas on electrically thick subtrate for THz focal plane array

Implications of printed antennas usage on thick substrates in focal plane array are investigated. Patterns of detector element with planar antenna in the focal plane of focusing system where studied. It is shown that antenna with main lobe not normal to surface is not applicable for imaging purposes. Different ways of obtaining good antenna pattern on electrically thick substrate of finite dimensions, namely, substrate lenses placed on a top of the antenna and holes through the substrate are shown. It is shown that extended hemispherical substrate lens begins to work from some critical radius and height.