EE6311 Fall 2009 Homework #3

Introduction to AWR Microwave Office or Agilent ADS
Transmission Lines

If designing in AWR:

• Read the AWR introduction “Getting Started (this version is 2004),” specifically:
• #3. AWR Design Environment Suite Section; review the Basic Operations sections
• #4 MWO: Using the Linear Simulator; read and perform the tasks outlined in the “Creating a Lumped Element Filter” project.
• Print out your final filter design example and response.

OR

If designing in Agilent ADS:

• Watch the ADS movies on the following site:
  http://ece-classweb.ucsd.edu/fall07/ece166/.
  ADS Tutorials
• Watch ADS example 1: *.wmv file ~ 4 minutes, OR
• Read ADS tutorial and/or Basics of ADS

• Using the elements from the #4 MWO: Creating a Lumped Element Filter” project, design the project in ADS
• Print out your final filter design example and response.

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For the following transmission lines, design each network “on paper” first using the graphical method. You will be determining the required width of the center conductor to give you the impedance value required. Then use MWO or ADS to simulate the TML. Submit your final circuit schematic and frequency (2 – 15 GHz) response plots (on the same graph of |S21| in dB, |S11| in dB) for each design.

Use: Center frequency, f_o = 10 GHz for all designs

Port impedances = 50 Ω unless specified otherwise

substrate ε_r = 2.2

substrate thickness, h = 0.381mm for microstrip, b=0.762mm for stripline, h=1mm for CPW

conductor thickness = 10 µm

conductor metal = Au (use default value for rho in AWR or ADS)

1. Determine the appropriate line widths for microstrip transmission lines with the following characteristic impedances: Use an empirical or graphical method to compute line widths and then use AWR TxLine or Agilent Linecalc to compare.

a) Z_L = 35 Ω, place quarter-wave transformers on each side to match the line impedance to the port impedance

b) Z_L = 50 Ω

c) Z_L = 150 Ω, place quarter-wave transformers on each side to match the line impedance to the port impedance, for this case, plot |S11| on the Smith Chart

2. Repeat problem 1 for stripline transmission media.