{'fraction_non_alphanumeric': 0.023106546854942234, 'fraction_numerical': 0.038510911424903725, 'mean_word_length': 4.1655629139072845, '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}}
A patch antenna for RFID reader

In this paper a micro-strip patch antenna for UHF band RFID reader with a center frequency of 2.45 GHz is present. The proposed antenna is a single feed circularly polarized metallic patch and has a simple structure, it has corner truncated square patch, ground plane and a probe feed. The patch antenna is printed on Rogers R04003 material with dielectric constant of 3.38 and dielectric loss tangent of 0.0027. The structure of antenna is simple and low cost. Simulation and experiment results of a constructed prototype with the center operating frequency at 2.45 GHz showed that the antenna has an impedance bandwidth of about 30 MHz, return loss S11 of about -19 dB, a gain level of about 7.5 dB. In its 3 dB bandwidth VSWR is less than 1.4.