Modeling of THz focal plane array on electrically thick substrate

Implications of printed antennas usage in focal plane arrays on thick substrates are investigated. Two different ways of obtaining a good antenna pattern on electrically thick substrate of finite dimensions are proposed, namely, substrate lenses placed on top of the antenna and holes going all the way through the substrate. Patterns of detector element with planar antenna in the focal plane of the focusing system are studied. It is shown that antennas with a slanted main lobe or with multiple main lobes are not usable for imaging purposes.