TDK Develops Thin-Film Band-Pass Filter

TDK Corporation developed its 1005-size thin-film band-pass filter that is just 0.3 mm thick filter of its kind. TDK applied the thin-film technologies it developed through the manufacture of HDD magnetic heads, which are among TDK's leading products, to create a filter that is substantially low-profile and smaller than earlier 2012-sized products with just one-twelfth the volume. As mobile communications devices become increasingly advanced and perform multiple functions, it is important that the signals required for communications functions be transmitted with low loss to achieve low power consumption and long component life and that signals are substantially attenuated.



The TDK applied the cutting-edge thin-film technologies that it developed through HDD magnetic head manufacturing and formed thin-films of copper wiring, insulation material, and dielectric material on a ceramic substrate to create the world's smallest band-pass filter-a 1005-size (1.0 mm long by 0.5 mm wide) component that is just 0.3 mm thick. The new filter will be used primarily for ensuring signal quality in mobile phones, wireless LAN and Bluetooth1 modules, Bluetooth headsets, and other devices. The thin-film technologies are also used in the manufacture of thin-film common mode filters, which are used as noise countermeasure components for ensuring signal quality in high-speed data transmissions.