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I experienced similar phenomenon.
It is added series chip inductor(about 2nH) to connect near pad, the return loss is improved.
I think ...
keeping filter's high Q , matching circuit must be directly connected to filter.
Best regards
mory
Hello all,
I need more information of interdigital and combline filter.
Can anyone update next papers?
R. J. Wenzel, “Synthesis of Combline and Capacitively Loaded
Interdigital Bandpass Filters ofArbitary Bandwidth”,
IEEE Trans. MTT, vol. MTT-19,no. 8, pp. 678-686, Aug.1971.
Itzhak Shapir...
Re: need MTT paper
I need information of microwave filters further.
Can anyone upload next IEEE paper?
R. Levy and S. B. Cohn, “A history of microwave filter research, design
and development,” IEEE Trans. Microwave Theory Tech., vol. MTT-32,
pp. 1055–1067, Sept. 1984.
thanks
Hi, John
What bandwidth is real pass band?
If pass band width is narrow, do you try band-pass filter?
For same rejection value band-pass filter is small order than low-pass filter.
There is combline and interdigital filter in band-pass filter.
regards
Re: Ku band att pad
Hi,
If you can't neglect parasitic element of chip,
ceramic side of chip resistor should be mounted to surface side.
(resist side of chip is mounted on substrate side)
This mount method is reduced parasitic element of chip resistor.
good luck.
ansoft filtertool
If you simulate combline filter with HFSS, next article is very helpful.
h**p://www.ansoft.com/hfworkshop04/2004_HFSS_Users_Workshop_Douglas_Dawson.pdf
combline filter paper
Hello all,
I need the following paper. Can someone upload?
D. G. Swanson, Jr. and R. J. Wenzel, “Fast analysis and optimization
of combline filters using FEM,” in IEEE MTT-S Int. Microwave Symp.
Dig., May 2001, pp. 1159–1162.
micro_mory
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