{"title":"Zeroth-Order Serpentine Antenna With Omnidirectional Radiation Pattern for Anti-Metal Tag Antenna Design","authors":"Muthukannan Murugesh;Eng-Hock Lim;Pei-Song Chee;Fwee-Leong Bong","doi":"10.1109/JRFID.2024.3376333","DOIUrl":null,"url":null,"abstract":"A new double-layered serpentine antenna is proposed for designing an anti-metal tag with an omnidirectional radiation pattern on metallic surfaces using the concept of electric and magnetic loop currents. The zeroth-order resonance (ZOR) structure here is made up of two closely stacked serpentine lines for providing the strong capacitive reactance and parasitic elements that are required for supporting the zeroth-order resonance. Also, the geometrical parameters of the double-layered serpentine structure can control the capacitive reactance for tuning the tag resonant frequency effectively. Due to the successful excitation of the ZOR mode, our tag antenna can generate a reasonably good omnidirectional radiation pattern with a consistent read range of 7.9 m– 8.9 m (at EIRP of 4 W) on metal in all directions in the azimuth plane. It has a uniform spatial coverage (\n<inline-formula> <tex-math>$>$ </tex-math></inline-formula>\n 8 m) in the entire azimuth plane. Additionally, the antenna’s good impedance matching allows for an excellent power transmission of \n<inline-formula> <tex-math>$\\sim 99$ </tex-math></inline-formula>\n%. The tag resonant frequency is found to be very stable and not affected much by any changes in the backing object and the maximum measured read range is \n<inline-formula> <tex-math>$\\sim 9$ </tex-math></inline-formula>\n meters in \n<inline-formula> <tex-math>$\\theta \\,\\,{=}\\,\\,\\pm $ </tex-math></inline-formula>\n50 o at 915 MHz. It has a footprint of 50 mm \n<inline-formula> <tex-math>$\\times50$ </tex-math></inline-formula>\n mm (\n<inline-formula> <tex-math>$0.153\\lambda \\times 0.153\\lambda$ </tex-math></inline-formula>\n) with a low profile of 3.38 mm (\n<inline-formula> <tex-math>$0.010\\lambda$ </tex-math></inline-formula>\n). Furthermore, the antenna configuration is a simple folded structure around the foam substrate, without comprising any complex structures.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE journal of radio frequency identification","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10470418/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
A new double-layered serpentine antenna is proposed for designing an anti-metal tag with an omnidirectional radiation pattern on metallic surfaces using the concept of electric and magnetic loop currents. The zeroth-order resonance (ZOR) structure here is made up of two closely stacked serpentine lines for providing the strong capacitive reactance and parasitic elements that are required for supporting the zeroth-order resonance. Also, the geometrical parameters of the double-layered serpentine structure can control the capacitive reactance for tuning the tag resonant frequency effectively. Due to the successful excitation of the ZOR mode, our tag antenna can generate a reasonably good omnidirectional radiation pattern with a consistent read range of 7.9 m– 8.9 m (at EIRP of 4 W) on metal in all directions in the azimuth plane. It has a uniform spatial coverage (
$>$
8 m) in the entire azimuth plane. Additionally, the antenna’s good impedance matching allows for an excellent power transmission of
$\sim 99$
%. The tag resonant frequency is found to be very stable and not affected much by any changes in the backing object and the maximum measured read range is
$\sim 9$
meters in
$\theta \,\,{=}\,\,\pm $
50 o at 915 MHz. It has a footprint of 50 mm
$\times50$
mm (
$0.153\lambda \times 0.153\lambda$
) with a low profile of 3.38 mm (
$0.010\lambda$
). Furthermore, the antenna configuration is a simple folded structure around the foam substrate, without comprising any complex structures.