October 12, 2012 Nihon Dempa Kogyo Co., Ltd. President: Hiroshi Takeuchi Compact, low-profile, high-performance 920 MHz band SAW filter for HEMS appliances and smart meters developed Nihon Dempa Kogyo Co., Ltd. has developed a compact, high-performance 920 MHz band SAW filter ideal for the Japanese home energy management system (HEMS) using smart meters and HEMS-compatible home appliances. The Japanese HEMS consists of a radio network between HEMS-compatible appliances and a smart meter in each household to control domestic energy consumption. The system uses a weak radio wave of 1W or less permitted by the appropriate national law (the specified low power radio) using the 920 MHz band. Conventionally this frequency band was seldom used by strong radio waves and almost always not affected by other services. With the recent reallocation of the 900 MHz band, however, frequency bands close to 920 MHz are now occupied by strong radio waves of mobile communication devices of Long Term Evolution (LTE) (see the figure below). To ensure the accurate radio communications between HEMS-compatible appliances and smart meters by suppressing radio frequency interference by mobile communication devices, a high-performance filter should be used to only pick up the necessary frequency and reliably attenuate unnecessary ones. The filter also needs to be compact and low-profile so that its modular product can be integrated into the radio component of the appliances. The optimal solution in responding to the needs is the use of a highly reliable, compact SAW filter. NDK has made full use of its expertise in the industrial specified low power radio to commercialize this new SAW filter which satisfies usage needs in general households. The product is available in two different sizes: One is a compact low-profile version of 1.4×1.1×0.55 mm and the other a higher-reliability version of 3.0×3.0×1.05 mm. Both versions come in standard frequencies of 920.1 MHz (6.8 MHz bandwidth), 922.5 MHz (4 MHz bandwidth), 924 MHz (8 MHz bandwidth) and 925.8 MHz (4.6 MHz bandwidth). Tailor-made products will be promptly available upon request. The new SAW filter allows accurate radio communications between HEMS-compatible appliances and a smart meter in households, contributing to home energy management Delivery of product samples is under discussion and mass production is planned to be launched January 2013. Figure 3.0×3.0×1.05 mm 1.4×1.1×0.55 mm <Contact> Sales Representative, Nihon Dempa Kogyo Co., Ltd. e-mail: [email protected] * For sample requests, please contact NDK sales personnel or send an e-mail to the address above. The specifications are shown below: Specifications 3.0×3.0×1.05 mm Type 1.4×1.1×0.55 mm Type Model Model Nominal frequency WFC48B0920CE 920.1MHz Nominal frequency WFD51A0920FE 920.1MHz Passband Min. ±3.4MHz Passband Min. ±3.4MHz width Typ. ±9.4MHz width Typ. ±18.3MHz Insertion loss Model Nominal frequency Typ. 2.1dB Max. 3.0dB WFC11B0922CG 922.5MHz Insertion loss Model Nominal frequency Typ. 1.8dB Max. 3.0dB WFD79C0925FG 925.8MHz Passband Min. ±2MHz Passband Min. ±2.3MHz width Typ. ±7MHz width Typ. -5.6/+12.3MHz Insertion loss Model Nominal frequency Typ. 2.1dB Max. 3.5dB WFC48C0924CF 924MHz Passband Min. ±4MHz width Typ. ±12MHz Insertion loss Model Nominal frequency Typ. 1.9dB Max. 3.0dB WFD14C0925CG 925.8MHz Passband Min. ±2.3MHz width Typ. -5.6/+12.3MHz Insertion loss Typ. 2.1dB Max. 3.0dB Insertion loss Typ. 2.1dB Max. 3.0dB External Dimensions