This paper presents a study of circular integral inductors (microstrip and embedded microstrip) on FR4 laminates using conventional design rules. There are no special materials or process to avoid extra manufacturing costs, and hence makes integral inductors desirable. The design focuses on coplanar type of inductor structures, which eliminates a ground plane to achieve a high Q factor. The performance of a discrete and integral inductor is compared. The parasitic coupling between closely packed inductors are also investigated. An integral inductor footprint (layout) library is suggested to encourage more users.
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