{'fraction_non_alphanumeric': 0.025044722719141325, 'fraction_numerical': 0.02146690518783542, 'mean_word_length': 4.283018867924528, '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}}
Analysis of a metal disc-shaped terahertz surface wave splitter with a center rod

We have proposed a metal disc-shaped terahertz surface wave splitter with a center hole and radially placed gratings. Unfortunately, appreciable reflected waves have been observed from the input port of the center hole. To reduce the reflected waves, we insert a metal rod with a tapered end into the center hole of the disc-shaped splitter operating at two frequencies. It is found that the reflected power is reduced from 77 to 10% at 1.0 THz, and from 23 to 18% at 1.5 THz.