{'fraction_non_alphanumeric': 0.022508038585209004, 'fraction_numerical': 0.0, 'mean_word_length': 4.990384615384615, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Microwave collimation based on zero index metamaterials with Dirac point.

The microwave zero index metamaterials (ZIMs) can be realized by loading lumped elements into two-dimensional transmission lines (TLs) with Dirac cones whose linear dispersion can appear around the center of the Brillouin zone. Based on Snell's law, the refracted angle of waves nearly equals zero when a point source radiates from the ZIM TL into the double positive (DPS) one in the ZIM-DPS TL structure. Experimental results demonstrate that at Dirac point the curved wavefronts in the ZIM region are transformed into planar ones in DPS region.