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A LTCC band-pass filter with dual transmission zeros for Bluetooth™ application was presented. With the classic network synthesis method, a lumped LC filter was educed and then transformed to physical prototype with LTCC process. This prototype was refined with DOE method, and was implemented in Zhejiang Zhengyuan Electric Co. Ltd. The measured insertion loss is less than 1.8dB at 2400MHz, and two transmission zeros are obtained at 1.7 and 7.1 GHz, respectively. They result in 40-45dB for lower stop band suppression and 45-50dB for higher stop band reduction. The experimental data agree very well with the 3-D simulation.

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