Module 5: Impedance Matching Learning Materials

To-Do Date: Feb 18 at 11:59pm
 

Module 5 -- Z match LEARNING MATERIALS

Introduction

Impedance matching is used to prevent reflections between RF components, to efficiently transfer power.

  • Before you start, if you are rusty (or haven't studied these before) please review Smith Charts, Quarter Wave Matching, Single Stub Matching
  • Thursday, we will cover L-network matching
  • next Tuesday, we will cover 3-element matching

Learning Materials

Material/Lecture content

Power Points from in class

Review Smith Charts

Goal: Please be sure you understand Smith Charts, as we'll be using them extensively from here on out in the semester.

Smith Charts resource page.

Smith Charts to use

Smith Charts to use

Know how to:

  • Normalize a load impedance and plot it on the Smith Chart (alternatively, read it off the Smith Chart)
  • Know where open, short, and matched impedances, capacitance and inductance are located.
  • Convert to admittance, reflection and transmission coefficients, voltage standing wave ratio (VSWR)
  • Find the input impedance for a load connected to a length of transmission line. Or, for a given input impedance and length of line, find the load impedance.
  • Understand the input impedance of an open or short circuited stub (how to make a capacitor or inductor from an open or short and length of line) See https://utah.instructure.com/courses/578994/assignments/6490625

Review Quarter Wave Transformer

Goal: A quarter wave transformer converts one real impedance to another using a length of line that is a quarter wavelength long,

Readings:

Microwave Engineering by Pozar, Download chapter 5.4

OR Planar Microwave Circuits, by Lee, chapter 4.3.2

Video lectures:

  • Application of quarter wave transformer

https://www.youtube.com/watch?v=VRZ9hsTaXzE Links to an external site.

  • Quarter Wave Matching without the Smith Chart

https://www.youtube.com/watch?v=TgF1Co9wQ-M Links to an external site.

  • Quarter Wave Matching Network with Smith Chart

https://www.youtube.com/watch?v=3JOtWxpUtbI Links to an external site.

 

 

Review Single Stub Match

Although we concentrate mainly on lumped element matching throughout this semester, this is a good review of how to add series or parallel elements, and transform them with lengths of lines.

From ECE 3300

Alternative Readings:  Microwave Engineering, by Pozar, Chapter 5.3

 

Matching Network Overview

Goal: Understand why we use matching networks, and the concept of lumped element networks

Reading: Planar Microwave Circuits, by Lee, chapter 4

Impedance Matching Networks Video Lecture (Jeff Walling)

Here is a PDF of the Lecture to take notes on: Walling - 6323 Fall 2016 - Lecture 2 Complete - Matching Networks.pdf Download Walling - 6323 Fall 2016 - Lecture 2 Complete - Matching Networks.pdf

https://www.youtube.com/watch?v=TyGYbmo969A (Links to an external site.)

 (Links to an external site.) Links to an external site.

2-element matching networks

Goal: be able to design an L-matching network

Readings:

  • RF Circuit Design by Bowick, chapter 4
  • Planar Microwave Circuits, by Lee chapter 4.3.1
  • Microwave Engineering by Pozar, chapter 5.1

Video Lecture: L-Network Matching Network

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

PDF notes to go with this Links to an external site.

Supplementary Materials:

Other suggested video lectures

https://www.youtube.com/watch?v=00oIX5U8zTo Links to an external site.

https://www.youtube.com/watch?v=00oIX5U8zTo&t=210s Links to an external site. Links to an external site.

Smith Charts to use

Analytical Method

 

3-element matching networks

Readings:

  • RF Circuit Design by Bowick, chapter 4
  • Planar Microwave Circuits, by Lee chapter 4.3.1
  • Microwave Engineering by Pozar, chapter 5.1

Video Lecture: Three-element Matching Networks Video Lecture (Jeff Walling)

Here is a PDF of the Lecture to take notes on: Walling - 6323 Fall 2016 - Lecture 2 Complete - Matching Networks.pdf Download Walling - 6323 Fall 2016 - Lecture 2 Complete - Matching Networks.pdf

https://www.youtube.com/watch?v=97GvFfGX4Y8

Pi and T Match Cookbook

Matlab files for pi and T match:

Impedance Matching Calculator (L, Pi, T, and more) https://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html Links to an external site.

Supporting Material

Impedance Matching Calculator (L, Pi, T, and more) https://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html Links to an external site.

Class LIVE VIDEO Meetings

We will meet Tuesday and Thursday this week, using the Zoom link on your left menu. If the meeting link doesn't show up, look under Previous Meetings.