Embedded antenna design based on zero and pole resonances for wireless sensor modules for applications in advanced greenhouses

2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) Pub Date : 2015-08-01 DOI:10.1109/RFIT.2015.7377935

Chun-Chih Liu, Shih-An Yang, Tzu-Heng Cheng, Shih-Yuan Chen

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引用次数: 1

Abstract

This paper presents an embedded antenna design for wireless sensor modules for application in advanced greenhouses. The wireless sensor modules are realized based on the UHF RFID tag plus low-power MCU chip [1]. In the antenna design, resonator models are used to tailor the input impedance of the antenna to satisfy the condition of complex conjugate matching, and hence the maximum power transfer between the RFID tag chip and the antenna. The proposed embedded antenna possesses an open-ended quarter wavelength strip monopole to generate a zero resonance, lowering the real part of the input impedance of the antenna, and a parallel chip capacitor near the feeding terminal to provide a pole resonance, pulling up the imaginary part of the impedance, to achieve conjugate matching to the highly capacitive RFID tag chip, whose input impedance is 18 - j171 Ω. The simulated realized gain of the antenna is -0.26 dBi, and the associated maximum read range is 8 m based on Friis' equation with the maximum EIRP of 4 W.

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基于零谐振和极点谐振的嵌入式天线设计，用于先进温室应用的无线传感器模块

本文提出了一种应用于先进温室的无线传感器模块的嵌入式天线设计。无线传感器模块是基于超高频RFID标签和低功耗单片机芯片[1]实现的。在天线设计中，使用谐振器模型来定制天线的输入阻抗，以满足复杂共轭匹配的条件，从而实现RFID标签芯片与天线之间的最大功率传输。所提出的嵌入式天线采用开放的四分之一波长带状单极子产生零谐振，降低天线的实部输入阻抗，并在馈电终端附近并联片式电容提供极谐振，拉起阻抗的虚部，实现与输入阻抗为18 - j171 Ω的高容性RFID标签芯片的共轭匹配。根据Friis方程，天线的仿真实现增益为-0.26 dBi，最大读取距离为8 m，最大EIRP为4 W。

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2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)

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