Radio disturbance characteristics for the protection of receivers used on board vehicles, boats, and on devices - Limits and methods of measurement - Specifications for active antennas
Active antennas used on board vehicles are electronic components in the sense of CISPR 25. Therefore, the requirements regarding emissions apply to it in its function as EUT. In addition to this, vehicle active antennas are used as part of the measurement chain for the evaluation of emissions produced by any other component in the vehicle. With a passive antenna no special considerations were necessary because it can neither generate emissions nor harmonics due to its linearity. This Publicly Available Specification (PAS) gives additional information for the use of active antennas for radiated emission measurement according to CISPR 25. Test set-ups at component level are defined for the determination of noise floor. The current vehicle antenna technology provides two categories of active antennas. The first category (I) consists of an active part (electronic part) and a passive part (antenna structure). These parts can be considered as two separate "black boxes". During the emission tests (antenna as EUT), the passive antenna part is normally replaced by an "artificial antenna network". Antennas with their active and passive parts inseparably combined within one housing are defined as category (II) antennas.