{'fraction_non_alphanumeric': 0.04806565064478312, 'fraction_numerical': 0.03985932004689332, 'mean_word_length': 5.279411764705882, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 1, '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}}
Band‐notched ultra‐wideband circular‐disk monopole antenna with an arc‐shaped slot

By embedding a simple arc‐shaped slot in a circular‐disk monopole antenna, an ultra‐wideband (UWB, 3.1–10.6 GHz) operation with a controlled notched frequency band can be obtained. The arc‐shaped slot is placed close to the boundary of the circular‐disk monopole and has a length of about one‐half wavelength of the desired notched frequency. The proposed slotted circular‐disk monopole antenna showing UWB operation with a notched frequency band for rejecting the 5.8‐GHz WLAN band is demonstrated. The effects of the dimensions of the arc‐shaped slot on the notched frequency band are also analyzed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 188–191, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20766