دانلود رایگان مقاله طراحی آنتن برای ورودی محیطی شبکه های حسگر متعدد عظیم

Abstract

This article describes the design and simulation of a pair of antennas on a small PCB with minimal coupling for a massive multiple input sensor network. The two antennas are planar inverted-F antennas (PIFA) that are fed with microstrip feed lines. The critical design factors are minimizing mass while creating ISM band and GPS L1 band antennas and developing data transmission schemes for maximum usage of all communication channels. The designed board is a 60 mm diameter, 0.6 mm thick circular FR4 board that weighs approximately 5 g. Keywords

5. Conclusion

Progress has been reported on the GlobalSense system featuring low-power, drifting airborne probes called eMotes for in-situ atmospheric monitoring. Data from such a system, deployed on a routine basis, can benefit a wide range of applications including weather and atmospheric modeling. The antennas described in this article are a novel design and implementation of PIFAs on a small, circular substrate. They are designed so the eMote can receive GPS signals and transmit sensor and GPS data to a base station. The eMotes are designed to be lightweight and maximize drag, thereby minimizing terminal velocity which translates into more in-situ data points. The current effort will be extended to include antenna fabrication, performance testing, and verification that antenna simulations agree with test results. Also, there will be tests to verify that eMotes perform at the desired ranges and that the communication protocols work as designed. Following an initial test and verification phase, a dual-band PIFA (or other microstrip antenna) will be designed. The dual band antenna will allow the rigid FR4 portion of eMote cap to shrink, thereby lowering overall the mass of the device. Mass reductions are critical to achieve the overall eMote mass (1 g) and terminal velocity (1 m/s) design specifications. The final goal of this project will be to demonstrate the complete Global Sense system with an ensemble of one hundred eMotes released at low altitude and multiple receivers collecting data from each one.