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Research on miniaturized LTCC bandpass filter with semi-lumped components for bluetooth application


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Research on miniaturized LTCC bandpass filter with semi-lumped components for bluetooth application
Dai YongshengXu LiWang LijieChen Shaobo
School of Electronic Engineering and Optoelectric Technology,NUST,Nanjing 210094,China
low temperature cofired ceramic filters for bluetooth application semi-lumped components suppression of high harmonics
A miniaturized low temperature co-fired ceramic(LTCC)bandpass filter with semi-lumped components for bluetooth application is researched here.The circuit topology of the bandpass filter is based on the second-ordered coupled resonance filter prototype.The prototype is modified to produce a pair of transmission zeros on both sides of the passband to improve stopband attenuation.The 3-D physical layout of the filter is realized by the semi-lumped structure.The capacitors are achieved by the lumped metal-insulator-metal capacitor and the inductors are achieved by distributional stripline.Test results show that,when the central frequency of the filter is 2.45 GHz,the insertion loss in the passband is less than 1.2 dB,the input/output of voltage standing wave ratios(VSWRs)are less than 1.5,and the low stopband attenuation is more than 25 dB from 0.1 to 2 GHz.The transmission zero generated at the high stopband makes the second and third harmonic suppressed well,and the stopband attenuation is more than 25 dB from 7.2 to 7.5 GHz.The test results are in good agreement with the simulation.The filter size is 1.6 mm×0.8 mm×0.6 mm only.


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Last Update: 2013-04-30