{'fraction_non_alphanumeric': 0.057569296375266525, 'fraction_numerical': 0.05543710021321962, 'mean_word_length': 4.365714285714286, 'pattern_counts': {'":': 0, '<': 2, '<?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}}
A High-Gain Circularly Polarized Slotted Patch Antenna

In this letter, a single-fed high-gain circularly polarized slotted patch antenna is proposed. The proposed antenna consists of a slotted radiation patch and a ground plate, which has a simple structure. The slots are etched on the radiation patch to radiate circular polarization. The measured impedance bandwidth for S11<−10 dB is around 17.4% (3.05–3.63 GHz). Also, the measured axial-ratio (AR) bandwidth for AR < 3 dB is around 5.4% (3.25–3.43 GHz). Moreover, the measured peak gain is about 10.2 dB at 3.34 GHz. The measured curves of S11, AR, and gain are in good agreement with the simulation. The proposed slotted patch antenna can radiate left-hand circular polarization (LHCP) stably from 3.25 to 3.43 GHz. The volume of the fabricated antenna is 0.43λ0×0.43λ0×0.07λ0. λ0 is the operating wavelength at the lowest frequency (3.25 GHz) for radiating circular polarization.