Analytical Impedance Match with Python

I created a quick Python function to calculate the component values for an impedance match between two real (resistive) terminations using the technique taught in the Introduction to Impedance Matching course.
Here is what the code ends up looking like, and it shows how useful Python can be for working as a "quick programmable calculator." In the old days, I might have been tempted to program my old HP48 calculator to crank out the same values. It only took a few minutes to put the code together, which is the beauty of working with Python.

Free Webcast: What Will 5G Be?

Author: 

Joe Boccuzzi

This webinar will provide an overview of areas 5G will address. We will begin with a sdiscussion on the shortcomings of present day cellular systems to highlight the items needing to be addressed in 5G. Provide the overall 5G goals and pillar use cases as defined by ITU. Several deployment options will be provided and summary of the 3GPP scenarios provided. Key system parameters will be discussed and the impact of 5G to a Cloud-RAN network architecture will be highlighted.

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.

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