• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.1
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• pp.11-17
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• 2004

In this paper, A miniature broad-band dime antenna is designed. This antenna consists of two stacked circular patches that create two cylindrical slots resonating at two slightly different frequencies, fed by a strategically positioned coaxial prove. To increase the bandwidth of microstrip patch antenna, a configuration of stacked type is used. Furthermore, to reduce the size of microstrip patch antenna and obtain a double resonant behavior, two shorting-walls are used. Experimental results show that the antenna bandwidth is about 26% centered at 5.8㎓ and are close agreement with the calculation results by HFSS 7.0 software.

• Journal of Korean Society for Geospatial Information Science
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• v.16 no.3
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• pp.43-49
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• 2008

The Real Time Location System (RTLS) is very important in the ubiquitous society for real time tracking of men, high price assets, and logistics products. In this work, we developed an active RF system for RTLS and tested its performance. The RTLS system developed in this work was constructed of three active readers and one active tag. The small size tag developed in this work operated with a coin type battery. To make the tag smaller, we used an internal PCB antenna and a chip antenna. We tested the performance of the tag. To reduce the manufacturing cost of our RF system, we used low price RF transceiver CC2510 chip-set. The CC2510 chip-set provided RSSI(Received Signal Strength Indicator) signal which could be used to determine the distances between an active tag and three active readers.