| 摘要 |
PURPOSE: A ground separating method and an apparatus in an RF board are provided to remove spurious component at a final output stage and improve performance of the final output stage by blocking the spurious component transmitted along a ground layer. CONSTITUTION: A ground separating apparatus in an RF board separates a local frequency supplying part(10) from a remaining ground layer(100) of a printed circuit board. The ground separating apparatus comprises a first layer including the local frequency supplying part(10), a second layer of a ground layer, a third layer including a power supply, and a fourth layer of a ground layer. The local frequency supplying part(10) is separated from the ground layer(100) with a clearance. A distributed low band pass filter(50) is inserted between the ground plane of the local frequency supplying part(10) and the ground plane of the remaining ground layer(100). The cutoff frequency of the low band pass filter(50) is designed to be lower than a fundamental frequency of the local frequency supplying part(10).
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