A 110 GHz Hybrid Integrated Transmitter Design

This paper presents a design of a millimeter wave (mm-wave) transmitting device, which integrates components fabricated in various technologies. It is composed of a transmitter front-end integrated circuit, an antenna array, and a silicon lens. The design is outlined with particular emphasis on accommodation of contrary requirements of individual elements and integration of the antenna array with other parts of the circuitry into a single device. The low temperature co-fired ceramics (LTCC) multilayer structure was chosen as a platform for integration. LTCC demonstrates good electrical parameters (low losses and relatively low permittivity) in the mm-wave range which facilitates design of an efficient antenna. Additional beam focusing and the gain enhancement is achieved by means of the silicon lens suspended over the antenna on an adjustable fixture. The problem of optimal lens placement for two types of antennas is considered.