Abstract
In wireless sensor networks (WSN), a sink node receives signals from a large number of sensor nodes. Hence, the sink nodes are required to integrate compact antennas with high performances, such as high gain, dual polarizations, and omnidirectional radiation. In this paper, a high-gain omnidirectional dual-polarized (HGODP) antenna with a slot-cavity structure is proposed for WSN. The proposed antenna integrates dual omnidirectional antennas with orthogonal polarizations, i.e., a thin open-ended cavity for horizontal polarization and four folded slots for vertical polarization. Due to the orthogonal operating modes of the dual polarizations, the antenna configuration is constructed within a compact volume, but with an independent design. A prototype of the proposed antenna is fabricated and measured within a ruler-like profile. The experimental results show that the realized gains are higher than 6.5 dBi and are achieved for both dual polarizations in 2.37~2.54 GHz. With the merits of high gain, high isolation, and omnidirectional radiation, the proposed compact antenna exhibits promising usage for sink nodes in WSN.
Highlights
The dramatically booming requirement of wireless sensor networks (WSN) demand more sensor nodes with sensing ability for different applications, such as ecological monitoring, health surveillance, and traffic control [1,2,3,4]
An omnidirectional dual-polarized (ODP) antenna composed of four vertical dipoles and four horizontal dipoles is presented in [14], which suggests that the port isolation is higher than 25 dB and has a bandwidth of 30%
The proposed antenna provides a high port isolation of 33 dB, indicating that the sink nodes within the proposed antenna have the ability to receive orthogonally polarized signals from different sensor nodes in wireless sensor networks
Summary
The dramatically booming requirement of wireless sensor networks (WSN) demand more sensor nodes with sensing ability for different applications, such as ecological monitoring, health surveillance, and traffic control [1,2,3,4]. For high-gain omnidirectional dual-polarized (HGODP) antenna designs, it is critical to choose radiating elements with consideration of the system dimensions, port isolation, and gain variation (the difference between the maximum and the minimum gains). An omnidirectional dual-polarized (ODP) antenna composed of four vertical dipoles and four horizontal dipoles is presented in [14], which suggests that the port isolation is higher than 25 dB and has a bandwidth of 30%.
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