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Kyocera to release 'smallest' SAW duplexer

Posted: 22 Feb 2007     Print Version  Bookmark and Share

Keywords:Kyocera  Surface Acoustic Wave  SAW  Duplexer  Kokubu Plant 

Kyocera Corp. has developed a small, lightweight SAW duplexer with a built-in matching circuit featuring improved attenuation and isolation characteristics. Production is scheduled to commence in April 2007 at Kokubu Plant in Kagoshima Japan, with monthly output of 10 lakh units. Kyocera expects to triple monthly production to 30 lakh units within a year.

Recently, mobile handsets have required numerous functions and high performance, including slim design, compact body, camera, high-resolution and large LCD, high-speed data transmission and multiple bands. The electronic components being mounted in terminals also need to be more integrated, smaller and lighter, resistant to temperature change, vibration and shock as well as highly reliable.

In responding to these demands, Kyocera said, they has developed the SD25 series of Chip Size Package (CSP) by taking advantage of its unique simulation technology that mounts minimised SAW element directly on ceramic substrate, seals it and coats it with resin. Optimising the combination of the SAW element and the substrate enables the duplexer to be as small as 2.5-by-2-by-0.8mm (typical value), making it one of the smallest duplexers in the industry. The product boasts resistance to climate and mechanical impact thanks to its airtight structure, which seals with soldering the surrounding of the element mounted on the substrate.

Low temperature co-fired ceramics is used as ceramic substrate. It allows an inductor for a matching circuit to be incorporated. As a result, the SD25 series requires no external inductor that is normally used for a matching circuit. This helps simplify circuit design while reducing the number of components and saving the component assembly space. "It is to reduce the size of mounting area by approximately 20 per cent on average," said the Kyocera's marketing division of Electronic Components Division.

The products have two different specifications, one for Japanese CDMA (Japan CDMA Band) and the other for North American CDMA (Cellular Band). Kyocera disclosed that they plan to develop products for the UMTS bands in the near future.

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