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Sensors 2012, 12(7), 8663-8674; doi:10.3390/s120708663

A Compact Annular Ring Microstrip Antenna for WSN Applications

1,* , 2, 2 and 1
Received: 28 May 2012 / Revised: 20 June 2012 / Accepted: 20 June 2012 / Published: 26 June 2012
(This article belongs to the Section Physical Sensors)
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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.
Keywords: microstrip antenna; resistor loading; effects of metal on antenna characteristics microstrip antenna; resistor loading; effects of metal on antenna characteristics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, D.; Song, L.; Zhou, H.; Zhang, Z. A Compact Annular Ring Microstrip Antenna for WSN Applications. Sensors 2012, 12, 8663-8674.

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