Module 2A: Learning Materials -- LP RF Filter Design Lumped Elements

ECE 5321/6323 LEARNING MATERIALS 2A -- RF Filters -- LP Lumped Elements

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Introduction

In this module, we will be learning about RF filters and how to design them using the Insertion Loss method.

2A: We will begin with the basics of lumped element filters, which are applicable at lower frequencies as well as RF frequencies. We will review low pass, high pass, band pass, and band stop filters, and how to implement low pass filters with maximally flat (Butterworth), equal ripple (Chebyshev), and Elliptic designs.

2B: We will then learn how to convert the LP designs to HP, BP, BS designs, still with lumped elements.

2C: Next, we will learn how to convert the lumped element designs to distributed designs using stubs and 2D: stepped impedances. Finally, we have information on practical implementation issues. 

Learning Materials

Readings

• Microwave Engineering by David M. Pozar -- Chapter 8.3 Download Chapter 8.3
• RF Circuit Design by Chris Bowick -- Chapter 3 (has detailed tables for Butterworth and Chebyshev filters)

Material/Lecture content

Supporting Material

Review: What are S-parameters? (reflection and transmission coefficients) https://www.youtube.com/watch?v=-Pi0UbErHTY Links to an external site.

Review: What are ABCD-parameters?(This matrix allows you to calculated cascades of series networks just by multiplying the ABCD matrix. These can easily be converted to/from S-parameters.)

• https://circuitglobe.com/abcd-parameters-of-transmission-line.html Links to an external site.
• https://www.youtube.com/watch?v=qnHaOwYfzgE Links to an external site.
• Relationship between ABCD and S-parameters https://www.microwaves101.com/encyclopedias/abcd-parameters Links to an external site.

Review: dB

• Decibels Download Decibels
• dB on a Spectrum Analyzer
• https://www.youtube.com/watch?v=1mulRI-EZ80 Links to an external site.

Dr. Furse's Filter Design Cookbook:

• Filter Design Handbook (Furse).pdf Download Filter Design Handbook (Furse).pdf
   

Filter Simulation in ADS:

• ADS Filter Design Guide (Keysight)
• https://www.youtube.com/watch?v=fe76wld3jgQ Links to an external site.

Filter Calculators: (Check your work with these)

• LC Design Tool
  • https://rf-tools.com/lc-filter/description.html Links to an external site.
  • https://rf-tools.com/lc-filter/ Links to an external site.
• Butterworth Design Tool
  • http://www.calculatoredge.com/electronics/bw%20pi%20low%20pass.htm Links to an external site.
• Chebyshev Design Tool
  • http://www.calculatoredge.com/electronics/ch%20pi%20low%20pass.htm Links to an external site.
• Other Circuit Calculators
  • http://www.calculatoredge.com/index.htm#electrical Links to an external site.

Class LIVE VIDEO Meetings

We will meet Tuesday and Thursday from 1230-145 by Zoom. See link on the Canvas navigation to your left.

Tuesday:

• You will need tables / graphs from RF Circuit Design by Chris Bowick, chapter 3. If you have not gotten this book yet, please print this handout before class: In class lumped elements.pdf Download In class lumped elements.pdf
   
• Here is the PPT we will work through today: Lumped Element LP Filters PPTs.pdf Download Lumped Element LP Filters PPTs.pdf
   

e Activities

You can access the activities by clicking "next" below or through the navigation links at the top of the page.

This module is 2 weeks long. Earn 100 total points for this module from some combination of the following:

• Module 2: Tutorial -- RF Filters (20 points, plus 10 points extra credit)
  • Note: You may do up to three tutorials, provided they are significantly different. (For instance, designing with Butterworth and then with Chebyshev is too similar, but designing with Butterworth, and then converting from LP to HP, is significantly different.) You can get credit for multiple tutorials simply by adding additional posts to this discussion board.
• Module 2 -- Filters: Muddiest Point Discussion (10 pts)
• Module 2: Class Feedback (10 pts)  

Later Assignments (for modules 2B,2C,2D):

• Module 2: Assignment 2b Converting LP Filter Design to HP, BP, BS (20 pts) 
• Module 2: Assignment 2c Converting Lumped Element Designs to Stub Filter (20 pts) 
• Module 2: Assignment 2d Converting Lumped Element Designs to Stepped Impedance Filter (20 pts)