Professional Engineer, Nebraska
Experience Summary:
Duncan Aviation, 2008 to present
Lincoln, NE 68506
OEM Systems Engineer
Designed wiring diagrams for business aircraft cabin systems: entertainment, lighting, and AC power.
Laird/Centurion Wireless Technologies, 1996 to 2008
Lincoln, NE 68504
Antenna RF Engineer
Designed antennas for portable devices, especially cell phone handsets and land mobile radios
US Army Missile Command, 1985 to 1996
Redstone Arsenal, AL 35898
Electronics Engineer, 2LT to GS-13
Designed radar systems for missile guidance
Accomplishments:
Led an engineering team to build a radar from the ground up (the Rapid Cueing Sensor). The team successfully demonstrated the acquisition of targets and the handoff of target coordinates to an adjacent weapon system. I personally was responsible for the RF hardware, the target acquisition alogorithm and DSPs, and the target simulator while simultaneously directing the rest of the team in developing the scanning hardware, the data acquisition hardware, the decorrelator, the FFT hardware, and the data interfaces. (US Army)
Designed hundreds of antenna iterations for dozens of customers producing tens of millions of antennas and generating tens of millions of dollars in revenue. (Centurion)
Established my company’s credibility for antenna measurements, as stated by our customer. I coordinated installation of the tapered anechoic chamber; wrote software, controlled hardware, and measured reflectivity per IEEE standard 149-1979. (Centurion)
Setup measurement procedures for outdoor antenna measurement in the VHF and UHF frequency bands. (Centurion)
Awarded 11 patents. Most of the patents involved working with an engineering team of mechanical and electrical engineers. (Centurion)
Coupled meander line switched antenna
Satellite (2)
3D pattern measurement hardware
PIFA antenna contacts
Modified Wheeler cap (2)
Coaxial monopole (2)
Design patent
SAR reduction antenna
Made possible, through flaw detection, a new type of antenna/audio module. I specified hardware and wrote signal processing software to detect acceptable audio performance of the antenna/audio modules. The result was millions of dollars of revenue on several different programs. (Centurion)
Assembled RF hardware and configured data acquisition methods for measurement of propagation effects. The results of several types of measurements were crucial for determining feasibility of several types of weapons systems. In some cases the propagation effects were shown to have minimal effect on missile guidance. In other cases, the entire weapon system had to be redesigned because of the propagation effects. The conclusions were used to save hundreds of millions of dollars by preventing the continuation of the program. (US Army)
Modified an instrumentation radar, changing it into an angle tracking radar. Debugged and adjusted range tracking circuits that were added to the instrumentation radar. Applied weighting coefficients to improve range sidelobes of the frequency hopping instrumentation radar. (US Army)
Designed 4-layer RF printed circuit board (PCB) to demonstrate the coupled meander line switched antenna patent concept. The central concept was to include DC bias lines in the meander antenna that functioned as RF antenna elements while simultaneously supplying DC bias voltage. The bias lines switched PIN diodes on the antenna element to change the electrical length of the meander line antenna elements. The main PCB included bias selection logic, voltage regulation, decoupling components, a varactor for fine tuning, DC blocking capacitors, and RF blocking inductors (bias T‘s). (Centurion)
Developed troubleshooting procedure to isolate and remedy EMI that was inhibiting proper functioning of a cabin selector switch. Three solutions were uncovered. Based on the cost to implement, 2 of three solutions were applied depending on an aircraft's phase of assembly. (Duncan Aviation)
Experience:
In the following areas, I can function with adequate proficiency and minimal supervision
Digital
Discrete logic
Microprocessors
Microcontrollers
Digital signal processors
Analog
Op Amps
Audio filter
Discrete FET and BJT switching
Discrete FET and BJT audio amplifiers
Control Theory
Linear and nonlinear system theory
Sensors and sensor interface circuits, analog and digital
System modeling, closed loop simulation
Model based development
RF
Filters
Transmission lines
Modulation theory and design
Demodulation theory and design
RF amplifiers:
noise figure, 1dB compression, 3rd order intercept, matching, gain, stability
Smith Charts
Frequencies encountered: 30MHz to 95GHz
Propagation effects, measurement and calculation
Antennas:
12 years developing antennas for portable devices -
Handsets:
Monopole
Helical
PIFA
Coaxial dipole
...
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