Experiment#5 Single-Stub Tuning 1.

Experiment#5
Single-Stub Tuning
We see in this experiment how to do Single-Stub Shunt matching.
1. Open up AWR from the START menu.
Start > Programs > AWR 2008 > AWR Design Environment
2. To create a project choose File > New Project. Name the new project and the directory
you want to write it to by choosing File > Save Project As. The project name displays in
the title bar. To open an existing project, choose File > Open Project. To save the current
project, choose File > Save Project. When you save a project, everything associated with
it is automatically saved. AWR projects are saved as *.emp files.
3. To set default project units:Choose Options > Project Options. The Project Options
dialog box displays. Click the Global Units tab and verify that your settings match those
in the following figure. You can choose units by clicking the arrows to the right of the
display boxes.
4. To create a schematic or netlist, right-click Circuit Schematics in the Project Browser
and choose New Schematic or New Netlist.
5. Draw your circuit in the schematic window according to figure 1. All the components
are taken from different palletes in the left side of the window.
(What is ZL?)
6. Set the parameters of the substrate by double clicking the MSub icon (as shown in Fig1).
PORT
P=1
Z=50 Ohm
MTEE
ID=TL2
W1=3892 um
W2=3892 um
W3=3892 um
1
MLIN
ID=TL1
W=1 um
L=1 um
RES
ID=R3
R=15 Ohm
2
3
IND
ID=L1
L=0.796 nH
MLEF
ID=TL3
W=1 um
L=1 um
MSUB
Er=2.2
H=1270 um
T=12.7 um
Rho=1
Tand=0
ErNom=2.2
Name=SUB1
Figure1
2
6. Calculate length and width of MLIN with TXLINE
 Click on TXLINE under Tools menu.
 Insert substrate parameters (H=1270um, T=12.7um, Dielectric constant=2.2,
conductivity=1E+50).
 Type in Zo=50ohm, Frequency=2GHz and E_eff value=calculate (Length of line=?.
 Click on Synthesize arrow. It will calculate W and L for you. (Check Unit =um)
 Change Component Parameters: Change width and length from the numbers (W, L)
in TXLINE window.
7. Add Open Circuit Stub (MLEF)
 On the Schematic Window: get a part MLEF
 Then, connect to the MTEE part.
 Change Width of MLEF (3891.85um).
 Calculate the length of MLEF and Change Parameters of Open Circuit Stub (MLEF)
 Click on TXLINE under Tools menu.
 Insert substrate parameters (H=1270um, T=12.7um, Dielectric constant=2.2,
conductivity=1E+50). Verify the units of parameters.
 Type in Zo=50 ohm, Frequency=2GHz and E_eff value=calculate (Length of line = ?)
 Click on Synthesize arrow. It will calculate L for you (given W=3891.85um).
 Change the parameters of MLEF
8. Add graph and measurement to measure magnitude of s11. Start = 1GHz,
Stop=3GHz and Step=0.2GHz.
 Plot the magnitude of S(1,1) parameter and add marker (put it on 2GHz).
9. Tuning Parameters.
When you place the Tune tool over a schematic element, the cursor displays as a cross
icon to indicate that the parameter is tunable.
To tune the circuit:
a) Click the schematic window to make it active.
b) Click the Tune Tool button on the toolbar or choose Simulate > Tune Tool.
 Move the cursor over the L parameter of MLIN. The cursor displays as a cross.
 Click to activate the L parameter for tuning. The parameter displays in an alternate
color.
 Repeat Steps “b” through the W parameter of MLIN and the L and W parameters of
MLEF.
 Click the graph window to make it active.
 Choose Simulate > Tune. The Variable Tuner dialog box displays. You can also
click Tune button on the menu.
 Click a tuning button, and hold down the mouse button while sliding the tuning bar
up and down. Observe the simulation change on the graph as the variables are tuned.
 Slide the tuners to the values shown in the following figure, and observe the resulting
response on the graph of the tuned circuit. Note that the order of elements in the
Variable Tuner may differ from that shown. Click the Sweep button.
3

Click the X at the top right of the Variable Tuner to close it, and click the Tune Tool
button on the toolbar to deactivate the tuner.
18. Tuning with Smith Chart
 If you are using Smith chart instead of using S11 amplitude data, control length of
MLIN until the real part of the admittance is 1.
 Then change the length of MLEF until the imaginary part of admittance is 0.
 After matching the length of MLIN, the point on 2GHz should be at the center.
Graph 2
1.0
S(1,1)
Swp Max
Schematic
1
3000MHz
2.
0
6
0.
1
0.8
|S(1,1)|
Schematic 1
Graph 2
0.
4
0.8
0
3.
0
4.
5.0
0.2
5.0
10.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0
0.4
0.2
2000 MHz
r 0.985602
x 0.00170068
10.0
0.6
-10.0
0.2
2
-0.
.4
-0
.0
-2
3000
-1.0
2500
-0.8
2000
Frequency (MHz)
-0
.6
1500
-3
.0
0
1000
-4
.0
-5.
0
2003 MHz
0.01004
Swp Min
1000MHz