Design Enhancement of Miniature Lumped-Element LTCC Bandpass Filters

作者：Brzezina Greg^*; Roy Langis; MacEachern Leonard

来源：IEEE Transactions on Microwave Theory and Techniques, 2009, 57(4): 815-823.

DOI：10.1109/TMTT.2009.2015035

• Bandpass filters
• global positioning system (GPS)
• low-temperature co-fired ceramic (LTCC)
• lumped-element filter

We present a novel methodology for the design of miniature lumped element components embedded in a low-temperature co-fired ceramic (LTCC) package. The entire process, from initial schematic design, through individual element design, to complete device optimization is discussed. The design and fabrication of novel miniature lumped element LTCC filters is used to validate the proposed methodology. Commercial software tools are used to accurately model and simulate all aspects of the devices to ensure design success. In addition, the filters occupy only 0.03 lambda x 0.05 lambda x 0.004 lambda of a conventional low-permittivity LTCC substrate, which is among the smallest sizes reported. An advantage of these filters is that they use a true third-order topology with three multilayer L-C resonators, leading to superior stopband performance. For the first time, measured results are shown for two new bandpass filters targeted for global positioning system applications. Measured results are in good agreement with the simulations and show an insertion loss of 2.8 dB and a return loss of 21.3 dB at the center frequency of 1.64 GHz.

• 出版日期2009-4