The current CISPR 12 method for vehicle radiated emissions has been shown to under estimate the maximum emissions by up to 30 dB due to limited scope of the test. In this project we are are working on an alternative method which improves the accuracy whilst still mainitining the fast measurement time.
The CISPR 12 method measures the radiated emissions only at two locations, which is the main cause of the error compared to a full 360 rotation of the antenna around the vehicle and and antenna height scan as used by many other non-automotive standards. The Microstrip method seems to be as simple as CISPR 12 whilst producing a more accurate result.
- Max Paterson
- John Dawson