TDK Develops "World's Smallest" Thin Film Band-Pass Filter for Mobile Devices
29 September 2008
TDK Corporation announced that it developed a 1005-size thin film band-pass filter that is just 0.3mm thick, claiming it to be the world's smallest filter of its kind. The company applied the thin film technologies it developed through the manufacture of HDD magnetic heads to create a filter that is substantially low profile and smaller than earlier 2012-sized products with just one-twelfth the volume.
According to TDK, mobile phones and other mobile communications devices have become increasingly advanced in the past several years as they adopt functions, in addition to their core functions, including transmission of relatively large volumes of data such as graphics and mobile internet capabilities. Also, attractive hardware designs have became as important as function, and as demand for compact, lightweight, and easy to use devices rises, so does the need for compact, low-profile electronic components. There is also a need for further miniaturization of the electronic components used in the numerous modules that make up electronic devices.
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 unneeded signals are substantially attenuated.
To respond to these market needs, 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 band-pass filter-a 1005-size (1.0mm long by 0.5mm wide) component that is just 0.3mm 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.
Thin film technologies, one of TDK's areas of expertise, 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.
