Abstract
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.
Highlights
Microstrip patch antennas have been widely used in many systems [1,2,3,4] because of their attractive features such as compact size, low profile, light weight and ease of fabrication [5,6,7,8,9]
In our studies the steel installation base greatly influenced the characteristics of the proposed antenna such as resonant frequency, bandwidth and radiation characteristics, etc., so how to design the metal carrier was an important issue in the antenna design
A compact annular ring mirostrip antenna backed with a steel installation base was realized
Summary
Microstrip patch antennas have been widely used in many systems [1,2,3,4] because of their attractive features such as compact size, low profile, light weight and ease of fabrication [5,6,7,8,9]. The size of the designed antenna must comply with the requirements of the limited mounting space. Another main consideration of the research was the impact on the antenna’s performance of the steel installation base. In our studies the steel installation base greatly influenced the characteristics of the proposed antenna such as resonant frequency, bandwidth and radiation characteristics, etc., so how to design the metal carrier was an important issue in the antenna design. To meet the compact and conformal requirements an annular ring patch antenna with a loaded chip resistor was designed.
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