가입자의 수가 놀라운 비율로 증가하고 고품질ㆍ광대역 데이터 통신에 대한 요구가 증가하면서 이동 통신에 사용되는 주파수원이 부족하게 될 것으로 예상된다. 주파수의 재사용률을 향상시키기 위하여 공간적인 방향성을 가지는 안테나를 이용하는 것과 송신하는 전력을 줄이는 것은 주파수원의 효율적인 사용을 할 수 있게 할 것이다. 가까운 미래에는 도달하는 신호를 빨리 추적하는 높은 이득을 가지는 안테나가 많이 요구될 것이고 빠르게 성장할 것으로 기대된다. 그런 다양한 기능을 가지는 안테나를 실현하기 위하여 디지털 빔 형성 안테나가 미래의 지능 안테나로 제안되었다[1],[2]. 따라서 본 논문에서는 디지털 빔 형성(digital beam forming, 이하 DBF라 한다.) 안테나의 빔 형성 방법, 원리, 특징에 대하여 살펴볼 것이다.
KSP Keywords
Digital beam forming(DBF)
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