MIC EXPERIMENT-5

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.

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:

Simulation Results:

LayOut:

Conclusion: