Module 2C: Learning Materials -- RF Filter Design Stub Design

To-Do Date: Feb 2 at 11:59pm
 

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 -- Download 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 Links to an external site.

    STUB Filters

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

    https://www.youtube.com/watch?v=-l5nTRQxbtg Links to an external site.

     

    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)

    Dr. Furse's Filter Design Cookbook:

    Filter Simulation in ADS:

    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 Links to an external site.

    Part 2:

    https://youtu.be/kZRBzSSbMGg Links to an external site.

    Part 3:

    https://youtu.be/ruUd095uwOo Links to an external site.

    Example (with numbers)

     

    Activities

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