International Symposium on Antennas and Propagation
I and T-Shaped Printed Antennas for a Wireless Sensor Network Operating at 5.7 GHz
Mazlina Esa, Evizal,
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The wireless sensor network (WSN) is a combination of sensing, computation, and communication into a single tiny device , as depicted in Fig. 1. A sensor network consists of an array of numerous sensor networks of diverse types interconnected by a wireless communication network . Sensor data is shared between these sensor nodes and used as input to a distributed estimation system. The system extracts relevant information from the available data. Fundamental design objectives of sensor networks include reliability, accuracy, flexibility, cost effectiveness, and ease of deployment. Each node has at least a sensor with an embedded processor, and low power radius. It acts as information source, sensing and collecting data samples from the environment. Node can also act as information sink, receiving dynamic configuration information from other nodes or external entities. The end portion of a node can be an antenna. A chosen configuration is the microstrip structure which allows for planar circuitry to be integrated with the WSN node. WSNs use small, low-cost embedded devices for a wide range of applications. They do not rely on any pre-existing infrastructure. The WSNs need not communicate directly with the nearest high-power control tower or base station, but only with their local peers. Each sensor or actuator becomes part of the overall infrastructure. Peer-to-peer networking protocols allow mesh-like interconnect for transferring data between thousands tiny embedded devices in a multi-hop manner. The flexible mesh architectures envisioned dynamically adapt to support introduction of new nodes or expand to cover a larger geographic region. Additionally, the system can automatically adapt to compensate for node failures -. The concept of WSN is based on a simple block sensing. Potential applications include medical monitoring, vehicle monitoring, industrial, ship, security system and control system. Example applications are shown in Fig. 2.