Patent ID: 8686821

Claim:
An inductor structure comprising: a plurality of solenoids, one of the solenoids serving as a core, the remaining solenoids being sequentially wound around the core solenoid, axes of the plurality of solenoids being substantially directed to a same direction; and at least one connecting line, each of the at least one connecting line being correspondingly connected between ends of two adjacent solenoids to serially connect the plurality of solenoids, the inductor structure being constructed in a multi-layer circuit board, wherein the axes of the solenoids are parallel to a planar direction of the multi-layer circuit board, wherein the multi-layer circuit board comprises N circuit layers and a plurality of dielectric layers located among the circuit layers, the number of the solenoids is M, and M is greater than 1 and smaller than or substantially equal to N/2, and wherein the circuit layers are sequentially arranged from a first circuit layer to an N th circuit layer along a direction, the solenoids are arranged inside out from a first solenoid to an M th solenoid, and each of the solenoids is represented as: an (i) th solenoid comprising: a plurality of (a i ) th conductive lines located in an (a i ) th circuit layer of the circuit layers; a plurality of (b i ) th conductive lines located in a (b i ) th circuit layer of the circuit layers; and a plurality of (i) th conductive vias, each of the (i) th conductive vias passing through all of the dielectric layers among the (a i ) th circuit layer and the (b i ) th circuit layer and connecting the corresponding (a i ) th conductive lines and the corresponding (b 1 ) th conductive lines to form the (i)th solenoid, wherein i is an integer ranging from 1 to M, a i and b i are integers ranging from 1 to N, a i <b i , a 1 >a 2 . . . >a M , and b 1 <b 2 . . . b M-1 <b M .