And welcome to this video
introducing Ansys HFSS.
An HFSS stands for
high frequency simulation software
and it is one of the simulation tools that are
inside of the Ansys Electronics Desktop
AEDT for short.
HFSS provides an electromagnetic solution
based on your model geometry.
It allows you to see and visualize many
different results
not limited to but includes S-parameters
electric and magnetic field plots
and one of its primary examples
are waveguides and waveguides have been
around for almost a century and they
come in many different shapes and sizes
and construction
functionally
they're all inline to its fundamental use
which is a means to transport or guide
energy from one point to another point
efficiently. It's a transmission line
and the transmission line that cross
section can be rectangular or circular
or any shape for that matter and that's
why we need an electromagnetic simulation tool
and today waveguides and its components
are an integral part of any application
communications/millimeter
5G applications, power, medical
any industry commercial, military
waveguides are used everywhere
and waveguides have suggested frequency
range of operation based on their
physical dimensions
and the relationship between
the waveguide dimensions and the lowest
frequency is simple.
If W is the larger of the rectangular
cross-sectional area
then the longest wavelength that can
propagate is lambda equals 2W
and the lowest frequency is
the frequency over C/lambda or 2W.
So, let's design a rectangular waveguide
using HFSS in the
Ansys Electronics Desktop Student version
for a 5G millimeter waveband.
The WR15 it's in the V band
and we look at some of its characteristics
and W is used in the naming convention
of the rectangular waveguide WR
rectangular waveguide
followed by
W in mills divided by 10
that's the standard naming dimension.
Open up that student version
insert an HFSS 3D design by checking on
the projects tab and selecting
insert HFSS design
by default the HFSS is
length unit is in millimeters and so we
need to change it from millimeters to mills
click on the units tab and let's select
mills in the unit type and click OK.
So, now let's go ahead and design
a WR15 waveguide cavity as per the electronic
industry alliance the EIA standards
which covers the V band.
the inside dimensions of the waveguide cavity
in mills are 148X74. On the tab name
draw select draw box command
select the box vertices as shown
first in the XY plane then in the Z plane
and you'll notice that an object called
Box1 is created under the solid type
with vacuum material on the left hand
side folder in the 3D modeler window and
let's edit the dimensions of this box
double click on the CreateBox command
a pop-up window appears in the UI interface
note there's always more than
one way to do an action
inside of HFSS so you can always
directly edit the Box1
inside the property panel window
and by default
that is on the bottom left
and you use these finite dimensions for
the waveguide for the WR15 click on ok
to accept the changes for the dimensions
and also remember we can use
the keyboard shortcut keys like ctrl+D
to fit all the contents in the modeler
window view.
We could view the AEDT UI introduction
for a list of the common shortcut keys.
Let's modify the box attributes
double click on that object Box1
open up the attributes dialog box and
you can rename the box to
wg_cavity sometimes if you appropriately name
the object it's very helpful especially
in more complex design that has many
numerous objects you can change the
material click on the cell next to the
material attribute and select edit
select definition pop-up window appears
and that contains a list of all of the
materials available
in the selected library
and by default
electrical material properties are listed.
AEDT includes coupled multiphysics
so, you can also view
thermal and or structural material
properties as well.
So, let's fill the waveguide with some material
say Taconic and click ok
and you can also select the color for
the object and set its transparency set
the transparency to 0.8
this way you can see the fields.
So far we've created the object that
represents the waveguide interior
and that is enough for the rectangular
waveguide geometry creation
the reason behind that is that HFSS
treats everything in the exterior of the
simulation domain to be
a perfect electric conductor
it's covered with a PEC material
hence there's no need to create a metal
housing for the waveguide.
See you in the next video where we'll
prepare the necessary steps for the
electromagnetic simulation inside of the
AEDT student version
thank you for watching this video and
find more information on HFSS or any of
the Ansys simulation tools just go to
ansys.com/courses today