An Experimental Study on Efficient Antenna OTA Test Method for Automotive Applications

Due to the large Fraunhofer regions of typical vehicles, especially at higher frequencies for e.g. mobile communications, over-the-air (OTA) measurement of automobiles by using the well-known standard test methods for e.g. the mobile devices are facing critical challenges. Recently, an efficient OTA test method for automobiles has been introduced by 5GAA, where the OTA parameters, e.g. total radiated power (TRP) and total isotropic sensitivity (TIS) are derived from a passive antenna measurement and a limited number of samples of an OTA measurement. This contribution presents an experimental study of the aforementioned efficient OTA test method by comparing the results obtained with the proposed method and the direct far field measurement. In this paper the tests are performed with a vehicle-to-everything (V2X) antenna system on the component level to enable the direct comparison in a far field scenario. However, it should be noted that the efficient OTA method mentioned here is intended to be implemented on automotive tests and is not limited to a particular application. The comparison reveals an excellent agreement on TIS and TRP parameters between the two applied methods.