Frequency and antenna selection affects accuracy measurement
Accuracy of free space radar depends on multiple criteria
Free-space radar transmitters for level measurement typically use 6, 26 and 80 GHz frequencies. Recently, there has been a lot of hype concerning high frequency radar transmitters. Some manufacturers claim that the higher the frequency, the better the performance. This is not necessarily true. Instead, accuracy is dependent upon a combination of frequency, beam angle, antenna configuration and installation but most importantly the dielectric constant of the product itself.
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Free space radars