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The wideband CDMA (W-CDMA) system at 2 GHz has a wide duplex gap between transmitting (Tx) and receiving (Rx) bands. When developing a small-sized SAW duplexer for this application, one needs a substrate with a large electromechanical coupling factor (K2) and good temperature coefficient of frequency (TCF). An SiO2/Al/LiNbO3 structure meets these two requirements, it also supports a large electromechanical...
We demonstrate the usage of EM + Circuit simulation techniques to do full design flow for a Transmitter module (TX module) design. We demonstrate the design of small size (8x5mm) TX module for IMT band - CDMA2000 mobile phone application.
A small-sized SAW duplexer for Wideband CDMA (W-CDMA) application at 2 GHz band has been developed. The W-CDMA application has a wide duplex gap between transmitting (Tx) band and receiving (Rx) band. To realize a small-sized SAW duplexer, a substrate with high electromechanical coupling coefficient (K2) and small temperature coefficient of frequency (TCF) is needed. Our W-CDMA SAW duplexer was fabricated...
There are many active mobile users today in trains, especially during the rush hour, hence the potential for mobile communication traffic in trains to rocket in the near future; as applications become diversified and communication tariffs becomes cheaper due to flat rate pricing. The increase in such traffic within a train will mean a mass of accessing users, moving along the railway tracks. In CDMA...
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