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Abstract
Step impedance coupled line band-pass filter is analyzed both theoretically and
experimentally in this thesis. We use Odd/Even mode excitation method in the t-
wo port network theory to find out the transfer function of our
filter. Then, we
use the method of amplitude approximation to derive the transfer function from
our specification. After we get the two transfer functions from
our filter stru-
cture and specification, we can use the pole and zero synthesis
method to obtain
the ideal structure of our filter. Then, we put these
structure into an EM soft
ware to fine-tune the filter's size.
The experiment is discussed in detail and is carefully calibrated by the TRL
(Through-Reflection-Line) calibration method. We first employ
microstrip line to
implement our filter. We then use the LTCC (Low temperature co-fired ceramic)
process to realize a multilayer ceramic filter. Good agreement between theory
and experiment is obtained.
Besides, we have successfully derived the equivalent circuit of our filter. We
also have proved the validity of this equivalent circuit by the design example
.
Keyword：Step impedance coupled line band-pass filter, Odd/Even mode excitation
method, amplitude approximation, Low temperature co-fired ceramic, multilayer
ceramic filter.
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