Demo on AWR Microwave Office

for the Beginners

Prof. D. Kannadassan,

Photonic and Microwave Division

School of Electronics Engineering

VIT University, Vellore - India

Email: dkannadassan@vit.ac.in

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Objective: Design and implement a simple matching network (Quarter Wave

Transformer) to match a 50 Ohm Transmitter to a dipole antenna (73 Ohm) on

the Microstrip substrate (Permittivity: εr=4.4, Height of the substrate H=1.6mm,

Conductor Thickness T=0.05mm, Loss tangent tan δ = 0.001)

Txer

QWT

H=1.6mm

substrate

W,L

QWT design:

ZA= 50 Ohm (Txer)

ZB= 73 Ohm (Dipole)

Therefore Characteristics

impedance of

QWT = SQRT (ZA×ZB)

≈ 60.1452 Ohm

Electrical Length = λ/4 = 90o

First, we will calculate the Width and length of

QWT Microstrip Line

AWR provides a simple planar transmission line calculator

which is available in “Tool Menu” Txline…

Change the “known” Material, Electrical and Physical

properties..

Don’t Close this window till experiment is over; it would

be helpful in future

Double Click

Start and Stop

Frequency can be

given as:

Start = 0.5×fo

Stop= 1.5×fo

Step = 0.1×fo

Don’t forget to push

“Apply” - Button

Step frequency is based on requirement

Change units based on requirement, so you shall enter

only values in future.

For circuit design, “Right Click” on Circuit Schematics

and Go for New schematic. And Name it

This area is called “Work-Space”, you can put circuit

elements and connect them

For circuit elements, we need “Element browser”, it’s

available in “View Menu”

“Element browser”

First of all, “Define” the Substrate as

“Microstrip Line Substrate”. Just Click

on “Substrates” (don’t expand) and Drag

“MSUB” to Work-Space

Change the Substrate definition. For

simplicity, the Rho (ρ) and Ernorm

(εr, norm) are taken as 1 and εr

respectively

Double Click on Each value and edit

Drag a Microstrip line from

“Microstrip” “Lines” “MLIN”

Change it’s W, L as for QWT

The Transmitter and Dipole antenna’s equivalent impedance can be

introduced as “Port”. Ports can measure almost all parameters, like S

Parameters, which includes port impedance.

You can get them in “Element Browser Port”, or it often available

in “Tool bar”.

Change to 73 Ohm at Port-2.

The construction of circuit is over, now we should measure the S-Parameters

through “Graphs”. Right Click on Graphs, Create a new graph.

Name the graph..

Right Click on graph and go for “Add New Measurement..”

You can select suitable measurement parameters. You should be careful about “

Data Source Name” which links with the required circuit.

Once selected the parameters, click “Apply” to add it in graph. It adds like a

legend. Once added all, click “OK”

Now we can go for “Simulation”, it’s available in “Simulate Menu”, click on

“Analyze”.

You got the result..

To get the numerical values of these measurement, you can duplicate it to tabular

in the Project browser by right click on the required graph.