Dual-band sensorÔ??antenna design for low energy consumption/cost wireless sensor nodes
Wireless sensor networks (WSNs) consist of nodes with a limited power source. Reducing the energy consumption is an effective way to extend the lifespan of the sensor node. In this contribution, a new approach of designing of a new class radio frequency sensorÔ??antenna for low energy consumption and low-cost wireless sensor nodes is proposed. Unlike the architecture of a conventional wireless sensor node, the proposed approach does not require any processor device that consumes power. It consists of integrating a capacitive sensor in a narrowband antenna that can send raw information, through its operating frequency which can be tuned depending on the value of the physical parameter to measure. As a result, a corresponding table between the resonant frequency of the sensorÔ??antenna and the measured physical parameter is obtained. Furthermore, by using a dual-band antenna, the proposed configuration is able to measure, simultaneously, two physical parameters. A prototype of the sensorÔ??antenna has been simulated and its behaviour has been validated with measurements. From the obtained results, it can be noted that the use of the proposed sensorÔ??antenna can be a good alternative to reduce considerably the complexity and hence the cost of wireless sensor nodes for WSN applications.