High performance low pass harmonic rejection filter for microwave, mm wave radar/5G-6G applications

Nowadays as of highly congested radio spectrum there is considerable need for high quality filters. On one side filters help to keep spurious signals level in a system low and maintain their high performances, while on the other side - they prevent unwanted interference signals to propagate externally and degrade functionality of other surrounding communication systems ensuring electromagnetic compatibility (EMC). In this paper an interesting solution for high performances low pass harmonic filter is presented for application in portable radar system. The filter belongs to the class of waffle iron filters however it is with asymmetrical construction which gives better performances than commonly used symmetrical ones.