To the practical demands of project, a set of solution on the highly steep band-edge band-pass filter based on LTCC technology was designed in this paper. Semi-lumped Structure is used in this design for operating convenience. With the help of advanced LTCC technology, miniaturization will eventually be realized. Cross coupling is used to add transmission zeros for better steep band-edge, but still cannot meet the needs of application in practice. So cascade two band-pass filter of identical structure by above and below become the best way to solve the difficulties. Simulation results are achieved with the help of circuit simulation and 3D simulation software. The center frequency is 1237.5MHz, its bandwidth is 575MHz, from 100MHz to 480MHz the stop-band attenuation is better than 40dB and it is better than 30dB from 1900MHz to 3050MHz. The size of product is only 4.5mm×3.2 mm×2.5 mm.
[1]
Yong-Xin Guo,et al.
Dual-band bandpass filter in LTCC
,
2005,
IEEE MTT-S International Microwave Symposium Digest, 2005..
[2]
Chi-Yang Chang,et al.
Realization of transmission zeros in combline filters using an auxiliary inductively coupled ground plane
,
2003
.
[3]
Jie Zhang,et al.
Design and implementation of an LTCC filter with high stopband rejection
,
2009,
2009 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT).
[4]
L. Roy,et al.
Design Enhancement of Miniature Lumped-Element LTCC Bandpass Filters
,
2009,
IEEE Transactions on Microwave Theory and Techniques.