Investigation of fractal MIMO concepts for radar imaging of bulk solids

Christoph Dahl, Ilona Rolfes, Michael Vogt

Eu­ropean Micro­wa­ve Con­fe­rence (EURAD) 2017, pp. 134-137, doi: 10.23919/EURAD.2017.8249165, Nu­rem­berg, Ger­ma­ny, Oc­to­ber 11-13, 2017


In this contribution, fractal antenna array geometries for multiple-input multiple-output (MIMO) radar systems have been investigated for their applicability in surface measurements of bulk solids. Array geometries based on a diagonal array in combination with the quadratic flake fractal have been analyzed. The presented fractal MIMO concepts can be utilized in order to improve the angular resolution and to reduce the side lobe level, what is exemplarily shown for an antenna array with 25 transmit elements and 25 receive elements. With the proposed fractal MIMO concept, the angular resolution is improved to 4.1 degrees and the side lobe suppression is increased to 13.9 dB compared to MIMO configurations with a square virtual array and with the same number of elements. In addition, the results have been experimentally evaluated by radar measurements in a bunker silo scenario.

[IEEE Library]