ABSTRACT
Broadcasting stations use transmitting antennas with vertical polarization, horizontal polarization, both vertical and horizontal polarizations, and circular polarization. The measurements on slant linear polarization reflect the need for a Frequency modulated (FM) broadcasting antenna to meet the requirements of receiving signals with different spatial-oriented polarizations, not simply vertical or horizontal. In two-antenna systems, one is intended for Automotive amplitude modulated (AM) and the other for FM reception. Generally, the defroster serves as the AM antenna. The antenna with an amplifier system requires reasonable glass area to achieve acceptable antenna gain. Numerical modeling of an antenna in parallel with an experimental cut-andtry design is the shortest way to achieve performances that meet specific requirements. A helix antenna has two major radiation modes: normal and axial. When the allowable window space for an antenna is very small, power matching between an antenna and an amplifier may become a problem.
