IEC PAS 62437:2005 pdf download 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
Scope
Active antennas used on board vehicles are electronic components in the sense of CISPR 25Therefore, the requirements regarding emissions apply to it in its function as EUT, ln additionto this, vehicle active antennas are used as part of the measurement chain for the evaluationof emissions produced by any other component in the vehicle. With a passive antenna nospecial considerations were necessary because it can neither generate emissions norharmonics due to its linearity
This Publicly Available Specification (PAS) gives additional information for the use of activeantennas for radiated emission measurement according to CISPR 25. Test set-ups atcomponent level are defined for the determination of noise floor.
The current vehicle antenna technology provides two categories of active antennas. The firstcategory (0) 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 antennanetwork”
Antennas with their active and passive parts inseparably combined within one housing aredefined as category (ll) antennas.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
CISPR 25，Radio disturbance characteristics for the protection of receivers used on boardvehicles, boats, and on devices – Limits and methods of measurement
3 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1
antenna matching unit
unit for matching the impedance of an antenna output to that of the 50 measuringinstrument over the antenna measuring-frequency range
3.2
antenna noise floor
voltage measured at the output of an active antenna via an origina coaxial cable in theabsence of a reception field strength (category ll) or when the passive part of the antenna isreplaced by a terminated artificial antenna network (category l)
3.3
artificial antenna network(AAN)
electrical circuit consisting of lumped inductors, capacitors and resistors qiving the samecomplex scattering parameter Szp as the passive part of the antenna installed in the vehicleboat or device
3.4
artificial network (AN)
lineimpedance stabilization network (LISN1))network inserted in the supply lead or signal/load lead of apparatus to be tested whichprovides, in a given frequency range, a specified load impedance for the measurement ofdisturbance voltages and which may isolate the apparatus from the supply or signalsources/loads in that frequency range
IIEV 161-04-05modified]
3.5
r.f.-amplifier
electronic part of the antenna system
3.6
shielded enclosure
screenedroommesh or sheet metallic housing designed expressly for the purpose of separating electro-magnetically the internal and the external environment
[IEV 161-04-371

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