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The paper presents results of a study considering a 2.4 GHz low-cost low-power-consumption Electronically Switched Parasitic Array Radiator (ESPAR) antenna suitable for wireless sensor networks and rural applications. The paper discuses the effects of realistic versus ideal loads in the process of modeling and design on the example of a four plus one elements antenna. The realistic loading is found to have a significant effect on the design, e.g., reducing the gain by over 2 dB and the return loss by up to 6 dB.
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