EXPERIMENT-5
AIM: Design Microstrip
Bandpass Filter using ADS.
A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.
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Bandpass is an
adjective that describes a type of filter or filtering process; it is to be
distinguished from passband, which refers to the actual portion of affected
spectrum. Hence, one might say "A dual bandpass filter has two
passbands." A bandpass signal is
a signal containing a band of frequencies not adjacent to zero frequency, such
as a signal that comes out of a bandpass filter
Typical Design Specifications:
1. Place MCFIL (Coupled Filter Section)
from TLines-Microstrip library palette.
2. Place a VAR block and enter w1, w2, w3,
s1, s2, s3 variables with values as shown here.
3. Modify the values in MCFIL components to
reflect these variable values for W and S parameters
4. Define lengths for MCFIL components as below:
a.
1st and 5th section: 245 mils
b.
2nd and 4th section: 195 mil
c. 3rd (center) section: 237 mil
5. Define a microstrip substrate(MSUB) with
following values:
a.
H=25 mil (Height of the dielectric)
b.
Er=9.9 (Relative Dielectric constant)
c.
Cond=4.1E7 (Metal Conductivity, in this case it is set for Gold)
d.
T=0.7 mil (Metal Thickness)
e.
TanD=0.0009 (Loss Tangent)
6. Place two 50-ohm terminations (Term)
components at input and output from Simulation- S_Param library palette
7. Place SP controller from Simulation-S_Param library
palette and its frequency as 3 GHz – 7 GHz with step size of 0.01 GHz
8. Run simulation and
observe the results and it should be similar to the one shown below.
Design in ADS:
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Simulation
Results:
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LayOut:
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