A Compact Annular Ring Microstrip Antenna for WSN Applications

Sensors

Daihua Wang¹  Linli Song²  Hanchang Zhou² 

[1] National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China; E-Mail:;Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China; E-Mails:

关键词: microstrip antenna;    resistor loading;    effects of metal on antenna characteristics;   

DOI  :  10.3390/s120708663

来源: mdpi

【 摘 要 】

A compact annular ring microstrip antenna was proposed for a wireless sensor network (WSN) application in the 2.4 GHz band. In this paper the major considerations of the conformal antenna design were the compact size and the impact on antenna's performance of a steel installation base. By using a chip resistor of large resistance (120 Ω) the antenna size was reduced to 38% of that a conventional annular ring patch antenna. With the addition of the steel installation base the resonant frequency of the antenna increases about 4.2% and the bandwidth reduces from 17.5% to 11.7% by adjusting the load resistance simultaneously. Several key parameters were discussed and optimized, and the antenna was fabricated and its performance measured. The antenna is well matched at 2.4 GHz with 34.2 dB return loss and –2.5 dBi peak gain. Meanwhile, it exhibits excellent radiation patterns with very low cross-polarization levels.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.