A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and first and second outer electrodes that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively extend along and cover at least parts of first and second end surfaces and parts of a first main surface. A stacking direction of the multilayer body and a coil axis direction of the coil are parallel to the first main surface. A low-dielectric-constant layer having a smaller relative dielectric constant than the insulating layers is provided between the multilayer body and the part of the first outer electrode that extends along the first main surface.

A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively cover parts of first and second end surfaces and parts of a first main surface. The multilayer body includes a low-dielectric-constant portion, which is centrally arranged, and high-dielectric-constant portions, which are arranged at both ends in the stacking direction. The length of a region in which the coil conductors are arranged in the stacking direction lies in a range from 85% to 90% of a length of the multilayer body.

A multilayer coil component includes a multilayer body that contain a coil. The coil includes coil conductors. A lamination direction of the multilayer body and an axial direction of the coil are parallel to a first main surface. A distance between the coil conductors adjacent to each other in the lamination direction is from 4 μm to 8 μm. Each coil conductor includes a line portion and a land portion that is disposed at an end portion of the line portion. The land portions of the coil conductors adjacent to each other in the lamination direction are connected to each other with a via conductor interposed therebetween. A width of the line portion is from 30 μm to 50 μm. An inner diameter of each coil conductor is from 50 μm to 100 μm.

A coil electronic component includes a body including an insulator; a coil portion embedded in the body; aggregates dispersed in the insulator, where the aggregates each comprise a plurality of magnetic particles, coating layers formed on surfaces of the aggregates using an insulating material, and external electrodes connected to the coil portion.

An inductor bridge includes a flexible substrate and a coil defined by a conductor pattern provided on or in the flexible substrate, and connects a plurality of circuit portions. The flexible substrate includes a rigid portion and a flexible portion, the rigid portion being wider than the flexible portion. The rigid portion includes the coil and a joining portion connected to another circuit. The coil includes two coil portions located at different positions in plan view, a flexible portion is located adjacent to one side of the rigid portion, and at least two coil portions of the plurality of coil portions are located on the one side when viewed from the joining portion.

An inductor includes a body including a support member including a through-hole, an internal coil disposed on the support member, and an encapsulant encapsulating the support member and the internal coil; and an external electrode disposed on an external surface of the body and connected to the internal coil. The external electrode includes a conductive resin layer and a double conductive layer of a first conductive layer and a second conductive layer, disposed between the conductive resin layer and the internal coil.

A transformer comprising a primary winding and a secondary winding. The primary winding has N.sub.2 number turns and having a first terminal and a second terminal. The secondary winding has having N.sub.1 fractional portions, which together form a full turn, are in close proximity to the primary winding to establish coupling between the primary winding and the N.sub.1 fractional coil portions, the transformer turn ratio from the primary winding to the secondary winding is N.sub.2:(N.sub.3/N.sub.1) where N.sub.2 is an integer equal to or greater than 1, N.sub.1 is an integer greater than or equal to 2, and N.sub.3 is an integer greater than or equal to 1. Also disclosed is a stacked integrated transformer having a primary winding and secondary winding of which one or both have a waterfall structure and a portion of which functions as a ground connected shield between the secondary winding and the primary winding.

Described is a high Q-factor inductor. The inductor is formed as a unit cell coil, which is copied twice for a dual-coil inductor and copied four times for a quad-coil inductor. For each copy of the unit cell coil, the coil is rotated a subsequent substantially 90 degrees or substantially −90 degrees. The rotation enables the terminals of the inductor to be routed equal-distant to a circuit that is placed in the line of symmetry between the two coils.

A multilayer coil component includes a multilayer body that contain a coil. The coil includes coil conductors. A lamination direction of the multilayer body and an axial direction of the coil are parallel to a first main surface. A distance between the coil conductors adjacent to each other in the lamination direction is from 4 μm to 8 μm. Each coil conductor includes a line portion and a land portion that is disposed at an end portion of the line portion. The land portions of the coil conductors adjacent to each other in the lamination direction are connected to each other with a via conductor interposed therebetween. A width of the line portion is from 30 μm to 50 μm. An inner diameter of each coil conductor is from 50 μm to 100 μm.

A coil component includes coil portions spaced apart from each other; and a body having a first core and a second core, spaced apart from the first core, wherein the coil portions include a first coiled portion and a second coiled portion that form at least one turn about the first and second cores, respectively, and a first extension portion and a second extension portion extending from the first and second coiled portions, respectively, and each surround the first and second cores. The body further comprises spacing portions, facing each other, defined between the coiled portions and spaced apart from the first and second cores. In the first and second extension portions, a line width of each of adjacent regions adjacent to the spacing portions is greater than a line width of a region except the adjacent regions.