Compact Reconfigurable Antenna with an Omnidirectional Pattern and Four Directional Patterns for Wireless Sensor Systems.
A compact reconfigurable antenna with an omnidirectional mode and four directional modes is proposed. The antenna has a main radiator and four parasitic elements printed on a dielectric substrate. By changing the status of diodes soldered on the parasitic elements, the proposed antenna can generate four directional radiation patterns and one omnidirectional radiation pattern. The main beam directions of the four directional modes are almost orthogonal and the four directional beams can jointly cover a 360° range in the horizontal plane, i.e., the main radiation plane of omnidirectional mode. The whole volume of the antenna and the control network is approximately 0.70 λ × 0.53 λ × 0.02 λ, where λ is the wavelength corresponding to the center frequency. The proposed antenna has a simple structure and small dimensions under the requirement that the directional radiation patterns can jointly cover the main radiation plane of the omnidirectional mode, therefore, it can be used in smart wireless sensor systems for different application scenarios.
Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China. rwang.uestc@hotmail.com.
Ren
R
Wang
Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China. bzwang@uestc.edu.cn.
Bing-Zhong
BZ
Wang
College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. huangweiyinghwy@126.com.
Wei-Ying
WY
Huang
Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China. xding@uestc.edu.cn.
Xiao
X
Ding
compact antenna; omnidirectional and directional patterns; reconfigurable antenna; wireless sensor system