PMC Lab-01

Use CST Studio to analyze a microstrip circuit.

1. Students who know how to use CST studio.

Wu(04-ieee)-microstrip directional coupler

Substrate: dielectric constant = 11.1, thickness = to be determined from the width of the 50-ohm line

Simulation frequency: 1.9-3.9GHz

Port number: from the lower left in CCW direction, 1, 2, 3, 4

Simulate the scattering parameters

Report:

Title

Student name

Circuit geometry: plan view

S-parameters: S11, S21, S31, S41 (vertical marker at 2.9GHz)

Check the power balance.

2. Beginner

1) The above structure with a single 50-ohm line of length 10mm. Lossless case

Metal = PEC, dielectric: tanδ = 0

2) Lossy case

Metal = copper, dielectric: tanδ = 0.007

Simulate the scattering parameters.

Attenuation coefficient:

Phase constant:

Guided wavelength:

Report:

Title

Student name

Circuit geometry: plan view

1) Find the substrate thickness using the microstrip calculator module in CST Studio

2) Plot the port electric field distribution.

3) Lossless case

Plat scattering parameters: mag(S11), mag(S21), phase(S21) (vertical marker at 2.9GHz)

Find the attenuation coefficient.

Find the phase constant and the guided wavelength.

Compare the phase constant with the port analysis.

4) Lossy case

Plot scattering parameters: mag(S11), mag(21), phase(S21) (vertical marker at 2.9GHz)

Find the attenuation coefficient.