TDK, as part of its continued efforts to bring environmentally friendly technical solutions to the market, has recently developed a plating process that enables manufacturing of thick, highly precise copper patterns on thin-film substrates without using typical exposure/etching technologies. The copper deposition can be to one or both sides of the thin-film substrate to reduce the coil’s [antenna’s] DC resistance (DCR). This innovation has been achieved through an electro-plating process that uses a nano-dispersed organic polymer called polypyrrole (PPy), a material solution from Achilles Corporation and is combined with TDK’s internal process technology. TDK’s unique copper plating process employs an "additive” methodology, where copper is plated only on defined areas to form the required pattern and is in direct contrast to standard methods that etch away from a copper layer in a subtractive process. Additionally, by incorporating TDK’s proprietary high-performance magnetic shielding materials, end-product miniaturization can be realized.

The PLE Series power inductor is a high-efficiency, low-leakage flux, ultra-compact power inductor that excels during operation with small batteries, such as those used in wearable devices.
Using our original structural design and newly developed materials, the PLE Series achieves a wide range of inductance values through advanced thin-film processes.
This chapter explains the structure and characteristics and provides other useful information including applications.　

As electronic devices become faster and operate at higher frequencies, capacitors used for noise filtering and decoupling applications require even lower ESL (Equivalent Series Inductance) characteristics.
Additionally, in automotive electrical systems, there is an increasing demand for low-ESL type products to improve safety and comfort and to meet the demands of infotainment.
This Solution Guide introduces various solutions utilizing TDK's advanced low-ESL components, the "YFF Series" 3-terminal feed-through filter.