Provided is a frequency multiplexer. The frequency multiplexer includes a stacked structure. The stacked structure includes at least one insulating layer and a plurality of metal layers arranged alternately along a stacked direction. The stacked structure forms at least one first inductive element and at least one capacitive element. At least two of the plurality of metal layers are provided with respective first patterned metal structures. The first patterned metal structures in the at least two of the plurality of metal layers are electrically connected to form a first multilayer planar spiral coil structure. The first multilayer planar spiral coil structure constitutes the first inductive element.

Radio frequency filtering circuitry blocks certain frequencies in an outgoing signal so that the signal may be transmitted over a desired frequency. The radio frequency filtering circuitry includes a first inductor having a first coil and a second inductor coupled to and disposed within the first coil. The second inductor has a second coil and a third coil symmetrical to the second coil. When current is applied to the radio frequency filtering circuitry, the current in the second coil causes a first induced current in the first coil and the current in the third coil causes a second induced current in the first coil, wherein the second induced current is approximately equal in magnitude and opposite in direction to the first induced current. As such, the second induced current may compensate for the first induced current.

An LC composite component comprising an element body, a helically wound coil disposed in the element body, and a capacitor disposed on an outer circumferential side of the coil in the element body. When viewed in an axial direction of the coil, the element body is rectangular, and the capacitor is disposed between at least two sides of the element body and the coil.

Provided a filter and a redistribution layer structure including the same. The capacitor includes a first electrode, a second electrode, a third electrode, a dielectric layer, and a conductive through via. The second electrode is disposed above the first electrode. The third electrode is disposed between the first electrode and the second electrode. The dielectric layer is disposed between the first electrode and the third electrode and between the second electrode and the third electrode. The conductive through via penetrates the dielectric layer and the third electrode to be connected to the first electrode and the second electrode, and is electrically separated from the third electrode. The first electrode and the second electrode are signal electrodes, and the third electrode is a ground electrode.

An LC filter includes a first electrode connected to a first via conductor between two ends of the first via conductor, a second electrode connected to a second via conductor between two ends of the second via conductor, a third electrode connected to a third via conductor between two ends of the third via conductor, and a fourth electrode connected to a fourth via conductor between two ends of the fourth via conductor. In a plan view viewed from the laminating direction, the second via conductor and the fourth via conductor are disposed on two sides of a virtual line connecting the first via conductor and the third via conductor, respectively. The second electrode faces the first electrode and the third electrode.

First and second coils have winding axes in a laminated direction of base material layers and are magnetically coupled to each other. First and second capacitors are positioned in the laminated direction on layers different from layers on which the first and second coils are provided. The first and second coils are connected so that the winding directions of the first and second coils are opposite. The second capacitor is connected in parallel to a series circuit of the first coil and the second coil. The first capacitor is connected between a position where the first coil is connected to the second coil and a reference potential electrode. Mutual inductance caused by coupling between the first and second coils and the first capacitor provides a first attenuation pole and a parallel connection circuit of the series circuit and the second capacitor provides a second attenuation pole.

Radio frequency filtering circuitry blocks certain frequencies in an outgoing signal so that the signal may be transmitted over a desired frequency. The radio frequency filtering circuitry includes a first inductor having a first coil and a second inductor coupled to and disposed within the first coil. The second inductor has a second coil and a third coil symmetrical to the second coil. When current is applied to the radio frequency filtering circuitry, the current in the second coil causes a first induced current in the first coil and the current in the third coil causes a second induced current in the first coil, wherein the second induced current is approximately equal in magnitude and opposite in direction to the first induced current. As such, the second induced current may compensate for the first induced current.

An electronic component includes an electronic component main body having a mounting surface with first and second baked electrodes located thereon at locations spaced apart from one another. A recess extends into the electronic component main body in the area between the first and second baked electrodes. The recess extends over at least a part of at least one of the first and second baked electrodes.

An electronic component includes a common port, a signal port, a first inductor, a second inductor, and a stack. The first inductor has a first end and a second end. The second end of the first inductor is connected to one end of the second inductor. A first inductor conductor constituting the first inductor is wound about an axis extending in a first direction. A second inductor conductor constituting the second inductor is wound about an axis extending in a second direction intersecting the first direction.

An electronic component includes a common port, a first signal port that selectively passes a first signal of a frequency within a first passband, a second signal port that selectively passes a second signal of a frequency within a second passband higher than the first passband, a first resonator provided between the common port and the first signal port in a circuit configuration, a second resonator provided between the common port and the second signal port in the circuit configuration, a stack, and a shield that covers a part of a surface of the stack. The shield includes a specific portion opposed to both the first and second resonators. A distance between the second resonator and the specific portion is greater than a distance between the first resonator and the specific portion.