Abstract
본 논문에서는 유비쿼터스 환경에서 사용되는 RFID(Radio Frequency IDentification)시스템을 외부잡음에 강한 스프레드 스펙트럼(Spread Spectrum : SS)통신방식을 적용하여 설계하였다. 설계된 시스템은 수신기의 PLL과 송 수신기의 PN확산 변 복조를 할 수 있는 알고리즘과 안정적인 BPSK(Binary Phase Shift Keying)신호를 출력하도록 트랜지스터 증폭기를 설계하여 시스템을 구현하였다. 또한 제작이 편리한 마이크로스트립 협대역 패치 안테나를 설계하여 시스템에서 필터가 차지하는 부피를 줄였으며, RFID의 유통물류에 할당된 국제표준 주파수 대역인 <TEX>$860\sim930MHz$</TEX>의 UHF대역에 적용이 가능한 저전력 시스템으로 설계되었다. This paper implements RFID(radio-frequency identification)System to which the system was apply SS(Spread Spectrum) method. The system designed by using the algorithm for microprocessor with PLL of the receiver, PN spread, modulation and demodulation of the transceiver, and transistor amplifier for the output of stabilized BPSK (Binary Phase Shift Keying) signal. furthermore, it reduced the interference of the signal by designing the micro-strip narrow banded patch antenna, which is convenient for printing and producing, and decreased the volume of filter size in the system. It is also designed for the lower powered system with the possible application to UHF band of <TEX>$860\sim930MHz$</TEX> for the international standard frequency band, which is the quota share of RFID distribution system.
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