Smith Chart Matching HTML 5 Version

An early version of the Smith Chart web app is now available to try out. There are a couple of issues that I will be working on initially, such as the frequency entry dialog box appears to be transparent for some reason. I'll also be working on the layout to try and make the various parts of the app fit better on the page. At the moment, the app is only optimized for mouse input and does not respond to touch-based dragging events (to move elements around on the chart).

Free Webcast Tutorial: MMIC Design Overview

Author: 

Ali Darwish

Instructor Ali Darwish has presented a free MMIC Design Overview webinar with Microwave Journal Magazine.

This webinar gives an overview of some of the practical strategies required to achieve success in the design of monolithic microwave integrated circuits (MMICs).

The following topics will be covered:

  • The advantages and limitations of MMIC Designs.
  • Active device modeling.
  • Calculating the lifetime of MMICs.
  • Modeling passive components.
  • Preventing unwanted oscillations.

Smith Chart Matching Web App

I've made substantial progress in developing the JavaScript version of the Smith Chart matching applet. The interface components that allow for changing frequencies and viewing component values have basic functionality at this point. A basic interface for setting the chart impedance is all that is needed and then all of the basic pieces will be in place. I should be able to make it available users very soon - although the appearance will start out a bit "unrefined".

Free Webcast Tutorial: Passive Components: Dividers, Couplers, Combiners

Author: 

Bob Froelich

Instructor Bob Froelich presents free webcast with Microwave Journal on Passive Components: Dividers, Couplers, and Combiners. View the webcast recording via Microwave Journal.

Outline:
Power Dividers

  • 2-way, 3-way and N-way
  • Isolation and loss
  • Phase relationships
  • Uneven power division
  • Combining RF power
  • Directional Couplers

Properties

Self-study Guide: RF Small-Signal Amplifiers (LNA)

Back in the mid-1990's, Les Besser and I wrote a series of articles on RF amplifier design for Applied Microwaves and Wireless magazine (unfortunately this magazine is no longer in circulation). Since that time, Les Besser and Rowan Gilmore have written a two-volume textbook on RF circuit design that covers this topic as well as a great deal of background knowledge on working with RF circuits.

The Effect of DC/LF Current in Ferrites for EMI

Author: 

Arturo Mediano

Arturo Mediano teaches courses on EMC/EMI and Signal Integrity for Besser Associates. He is a frequent contributor to industry magazines and journals on these topics. This article appears in the "Practical Tips" section of InCompliance magazine.

Ferrites for EMI suppression are usually chosen looking for high (resistive) impedance at the frequency of interest; but, sometimes, that ferrite is not working as expected. Perhaps you have saturation effects?

Applets are Dead(?) Long Live JavaScript

Now that browsers are dropping support for the Java plug-in, it seems that the days of applets are coming to an end. Although Java applets never dominated the mainstream web experience as much as more popular Flash-based content, they did find a niche in scientific and engineering applications - which is one of the few areas where they will likely be missed.

The EMC Blog

Author: 

Arturo Mediano

Arturo Mediano is a professor at University of Zaragoza (Spain) and founder of The HF-Magic Lab®, a specialized laboratory for design, diagnostic, troubleshooting, and training in the EMI/EMC/SI and RF fields. He is also an instructor for Besser Associates (CA, USA) offering public and on site courses in EMI/EMC/SI/RF subjects.

Evolving Satellite Market

The successful landings of Space-X's first stage rockets (and Blue Origin's success as well) signals a major breakthrough in the future reduction of the cost of space access. It seems to reason that this will result in a dramatic increase in the entrepreneurial interest in using satellite-based infrastructure to provide new services to a global audience. For example, companies like Google could deploy wireless internet access using small "cube" satellites that cost much less to build and launch than current systems.

Using Spread Spectrum Techniques to Reduce EMI

Author: 

Arturo Mediano

Instructor Arturo Mediano has written an article for In Compliance magazine:

Digital and power electronic systems can reduce the radiated and conducted emissions profile using spread spectrum techniques. Typically, no more than 10-12dB can be obtained with those techniques but the result can be useful to comply with regulations...

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