{'fraction_non_alphanumeric': 0.0103359173126615, 'fraction_numerical': 0.0103359173126615, 'mean_word_length': 5.404958677685951, '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}}
Broadband MIMO PIFA antenna with circular polarization for RFID readers

A novel broadband circular polarized two-element PIFA antenna with pattern diversity and high isolation is proposed which can be easily fabricated and embedded into RFID readers. Circular polarization characteristic of the proposed antenna is achieved by introducing a cross branch at its corner of the ground. The modified PIFA structure gives the antenna a broadband impedance bandwidth characteristic. A prototype is fabricated and measured. The results show that this circular polarized antenna with compact dimension has broadband from 840MHz-960MHz and good isolation of 15dB between the two elements over the whole band, which make the antenna suitable for terminal application of RFID readers.