International Journal of Antennas and Propagation (Jan 2022)

Research and Design of Radiofrequency Antenna on LCD

  • Wanshan Zhu,
  • Zhe Gao,
  • Zhuo Meng,
  • Chen Wang,
  • Yang Li,
  • Chunmei Wang,
  • Yunwei Jia

DOI
https://doi.org/10.1155/2022/5320561
Journal volume & issue
Vol. 2022

Abstract

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This work studies the electromagnetic field of a radiofrequency (RF) antenna on 7-inch liquid crystal display (LCD) and presents a new approach where the RF antenna is designed on LCD. This approach takes the magnetic field effect of LCD as an input parameter when building and simulating antenna models using the software Ansoft HFSS. After obtaining the PCB of the antenna, place the antenna on LCD, so that the antenna and LCD overlap up and down and measure the equivalent physical parameters as a whole. Last, use the vector network analyzer and Smith circle graph to tune the antenna system for completing the impedance matching of the whole system. This method breaks through the limitation that the card swiping area and the display area cannot be in the same area due to electromagnetic interference. It has changed the appearance design concept of the mobile point of sale (POS), and the antenna size can be 20%–100% of the POS display area. A contactless card read-write experiment for the proposed method has been carried out. Results showed the return loss is less than −30 dB, and the effective read-write distance of the antenna can reach about 5 cm. This design method provides a broader application prospect for mobile POS.