Mark W. Ingalls
19530 Creek Bend Drive
Spring, TX 77388
Machine2Wireless LLC
700 W. Research Ctr. Blvd.
Room 1260
Fayetteville, AR 72701
voice: (443) 928-3763

I have always liked to make stuff. I have also been blessed with a knack for figuring things out.

My Introduction to Microwaves

When I started out as a tech over a quarter century ago, I had no idea how the capacitors I was making worked. That bothered me, so I borrowed a copy of Matthaei, Young and Jones and tried to read chapters one and two. This seemed to help, but I couldn't seem to keep all that stuff straight in my head. So I decided to write it all out in my own words. The result of that effort eventually became a collection of notes I called Introduction to Microwaves.

Along the way, I began understand how microwave components work and how to measure their properties. I began to have new ideas about 'old' componentsI decided to apply to graduate school at Syracuse UniversityI had no idea how to support a family while studying but fortunately, Professor Arvas offered me a TA job. In addition to studying microwave engineering and computational electromagnetics, I got a chance to try out teaching (see here and here).

Filters, Antennas and Couplers

My first job after graduate school was designing coaxial resonator (CR) filters. We had big problems with small capacitor values, so I got the idea to use capacitor arrays, which were designed using Sonnet Lite® This led to a new problem: packaging parasitics. So, I got the idea to use linear simulation to de-embed the electrical components (which we could measure) from package characteristics (which we could not measure).

One day my boss asked me to explain how patch antennas worked. I came up with what eventually turned into an introductory paper on Microstrip Antennas for GPS Applications. The problem was, even though we now had a good concept of how patch antennas worked, we still had trouble designing them, especially for embedded applications such as this one. So I started using WIPL-D to design embedded antennas. 

Meanwhile, I got an idea for a new kind of directional coupler and co-simulated it in 
Genesys and Sonnet