Lumped-Element Transforms

AUTHOR: Randall W. Rhea
FORMAT: CD-ROM
PUBLISHED: 2002
ISBN: 1-884932-29-0

This CD-ROM describes how to use transforms to improve filter realizability. Transforms can also chnage the topology to be more suitable for a technology, such as coaxial or quartz resonators. The well-known tee to pi is one example transform. Other, more powerful transforms and how to use them to design practical filters are also explored.

SYSTEM REQUIREMENTS

• Windows 95 or higher Pentium II 333 MHz or faster
• 64 MB RAM CD-ROM drive
• sound card

PUBLISHER'S COMMENTS

This easy to navigate tutorial is designed for beginning wireless and RF engineers and those who wish to filter design techniques. No knowledge of higher math required; some familiarity with RF design and measurement terms helpful. This 60-minute course:

• allows you to move through each session at your own speed,
• requires no extra work books,
• provides you with testing methods for the key concepts taught.

NAVIGATING Lumped-Element Transforms
Navigation is similar to any computer-based information application. Clearly designated sections with an intuitive layout leave no frustrating distractions.

1. The CD-ROM can be started from any PC that has Windows 95 (or higher), at least 64 MB of RAM, a sound card and speakers.
2. The material may be accessed by either choosing to view the course start to finish, or by choosing individual pages of interest.
3. Once the course is started, no interaction is required. The course can be paused at any point, and can be viewed page by page like a book.

TABLE OF CONTENTS
Session I. Introduction
Direct Synthesis vs. Cookbook Filter Design
A Series-Resonator Filter Example
Stray Node Capacitance
A Basic Transform: Swap
A Second Basic Transform: Split
The Tee to Pi Transform
The Capacitive Tee to Pi
Applying the Tee to Pi
The Tubular BandpassQ
The Capacitive Pi to Tee
Session II. Canonic Filters
The Series-Resonator Example is Non-Canonic
The Tee to L Transform
Applying the Tee to L
Transformer Shifting Transform
Applying Tee to L Again
The Canonic Filter
Session III. The Norton Transform
The Norton Series Transform
The Shunt Norton Transform
The Conventional Bandpass
Applying the Series Norton
The Parallel-Resonator Bandpass
Transforming the Terminations
Reactive Impedance Transformers
The Filter with 50-Ohm Terminations
Session IV. Filters with Finite Frequency Zeros
A Symmetrical IF Bandpass
IF Bandpass without a Transformer
An Equal-Inductor Symmetric BP
Session V. Inverters
Impedance Inverters
Lumped-Element Inverters
Ideal Inverters
Converting Ideal to Real Inverters
An Example Using Inverters
Session VI. Norton and Resonator Branches
A Parallel-Resonator Bandpass with Finite Frequency Zeros