用于超高频射频识别的小型宽带高定向天线

doi:10.3969/j.issn.1001-506X.2020.05.03

Abstract

Abstract:

Based on the advantages of high front-to-back ratio and miniaturization of Moxon antenna, and combined with the broadband characteristics of bowtie dipole antenna, a compact broadband high directional planar printed antenna for ultra-high frequency (UHF) radio frequency identification (RFID) handheld reader is designed. The antenna adopts the composite structure of Moxon and bowtie dipole, uses the double-sided parallel-strip line feed, and introduces the microstrip tapered balun to achieve the feed balance. The ultimate antenna size is 0.34λ₀×0.22λ₀ (λ₀ is the wavelength of the central frequency), making it smaller than the microstrip quasi-yagi antenna. The measured results show that the reflection coefficient of the antenna in the 865~1 054 MHz frequency band is less than -10 dB, the gain is more than 3.5 dB, and the relative operating bandwidth reaches 20%. In addition, in the UHF unlicensed band of 902~928 MHz, the voltage standing wave ratio (VSWR) of the antenna is less than 1.4, the front-to-back ratio is greater than 15 dB, and the gain is higher than 5 dB.

Key words: miniaturization, broadband, high front-to-back ratio, planar printed antenna

CLC Number:

TN821.4

Shiqiang FU, Angyu XIONG, Weining CHEN, Shaojun FANG. Small broadband high directional antenna for UHF RFID[J]. Systems Engineering and Electronics, 2020, 42(5): 987-991.

Figures/Tables 9

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References 16

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Small broadband high directional antenna for UHF RFID

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