ECE 5321/6323 LEARNING MATERIALS 2C -- RF Filters-- Stub Design

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 8.5 (8.7,8.8 also of interest)
Planar Microwave Engineering by Thomas Lee (textbook, see Canvas online Bookshelf) -- Parts of Chapter 23
RF Circuit Design by Chris Bowick -- Chapter 3 (has detailed tables for Butterworth and Chebyshev filters)

Material/Lecture content

Topic 2C: RF Filter Implementation (Stub Filters)

Goal: Understand RF Filters Implementation

Richard's Transformation
Kuroda Identities
Stub Filters
Stepped Impedance Filters
Other types of RF Filters

Filter Implementation (Richard's Transformation and Kuroda Identities (RF Design Basics)

https://www.youtube.com/watch?v=gh8R49ED1VM

STUB Filters

Low Pass Filter Implementation using Stub (Richard's transformation, Kuroda Identities) (RF Design Basics)

https://www.youtube.com/watch?v=-l5nTRQxbtg

Supporting Material

Review: What is microstrip, and how to you find its impedance?

Review: How to you make an inductor or capacitor from an open or short circuited stub? (From ECE3300)

Text section
Video Lectures on Input Impedance

Dr. Furse's Filter Design Cookbook:

Filter Design Handbook (Furse).pdf

Filter Simulation in ADS:

ADS Filter Design Guide (Keysight)
https://www.youtube.com/watch?v=fe76wld3jgQ

Filter Calculators: (Check your work with these)

Class LIVE VIDEO Meetings

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

Sorry, I forgot to record class today. Here are recordings I made afterwards to show what we talked about in class:

Part 1:

https://youtu.be/-VMzBXD6xGA

Part 2:

https://youtu.be/kZRBzSSbMGg

Part 3:

https://youtu.be/ruUd095uwOo

Example (with numbers)

Activities

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

Module 2: Assignment 2c Converting Lumped Element Designs to Stub Filter (20 pts)
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)