Project 6 (HFSS)
Dielectric Slab Waveguide
Design Requirements:
1. Dielectric nonmagnetic slab waveguide of half thickness h = 0.125” and relative permittivity
εr = 2.56 surrounded by air cladding above and below. The frequency of operation is 30 GHz.
(Example 8.11 and 8.12)
For TMz and TEz , and plot the propagation constant vs. frequency graph using HFSS for the
first six modes
Procedure:
1. Select the solution type
2. Select the units to be mm
3. Designing the waveguide
a. Draw the dielectric slab waveguide
b. Make its length in the x-direction large enough to simulate the condition that it
extends to infinity
c. Draw the outer air cladding
4. Assigning Materials
a. Select the dielectric core to assign material. Assign a User defined material with εr =
2.25 and μr =1
b. Select the outer air box to assign material. Assign air for it
5. Assigning Excitations
a. Assign wave port excitation to the front and back faces.
b. Define Impedance lines for the first 6 modes
6. Solution Set-up
a. Set up an Adaptive solution at 30GHz, with 10 passes and delta as .008
b. Set up a Discrete Sweep solution from 10-40 GHz with a step size of 1.
7. Analyze the results
a. Plot the Propagation constant vs. frequency to check for TM zm and TE zm (even and
odd)
b. Plot the Field patterns in the central core of the dielectric waveguide for each of the
modes.
c. Plot the E Field to analyze the decaying surface waves