Developing trend of SAW device package
From: Author: Publish time:2010-10-13 15:59 Clicks:321
As the mobile communication frequency is extended from 900MHz to 1800MHz and 2400MHz and above, the SAW filter for mobile communication is also increased to the corresponding frequency band. Several companies have supplied 900MHz and 1800MHz dual-band front-end modules, the so-called "2in1."
A typical example of an SAW multichip module is the TDK front-end module for dual-band EGSM-DCS mobile phones in Europe. The front-end module contains a duplexer, a Tx-Rx switch, a low-pass filter, a surface acoustic wave filter and about 20 inductors and capacitors. SAW filter exposed in the front-end module, the use of flip-chip welding. The entire module uses low temperature ceramic (LTCC) material. This design reduces the mobile phone RF part of the development of the difficulty of shortening the development cycle and reduce costs.
The problem with the increase of the operating frequency band is the suppression of the electromagnetic feedthrough of the package tube. In the same premise of other parameters, the higher the operating frequency, the greater the input and output of electromagnetic feed-through. SMD3.0mm * 3.0mm package tube in the frequency band above 3000MHz inhibition of electromagnetic feed-through will be less than 60dB.Therefore, the new design theory and method to be studied and developed.