David P. Markell Email & Phone Number

Florida, United States

Remote

• Supports the Peraton Space Exploration Networks Services and Evolution (SENSE) contract for NASA.
• Performs Senior RF/Antenna Systems Engineer duties for the NASA Lunar Exploration Ground Sites (LEGS) and Antenna for Roman Mission Support (ARMS) in support of NASA Artemis and Nancy Grace ROMAN Space Telescope.
• Responsible for RF/antenna systems engineering activities associated with the development of NASA communications ground systems in support of new and existing… Show more
• Responsible for RF/antenna systems engineering activities associated with the development of NASA communications ground systems in support of new and existing programs and initiatives and NASA science missions.
• Created Earth-to-Spacecraft RF path/link signal distortion simulations including G/T and EIRP in Keysight SystemVue for the NASA Direct-to-Earth Network forward and return signals at S-band, X-band, and Ka-band.
• Created Earth-to-Spacecraft RF path/link simulations in Ansys STK to determine mission signal access with the best Eb/No performance at S-band, X-band, and Ka-band. Show less

Largo, Florida

• Lead System Test Engineer for the production of an X-band pulse Doppler radar, SPQ-9B,
• Performed production X-band phased antenna array measurements in a Nearfield antenna test range
• Performed production X-band and Ka-band monopulse radar electrical-to-mechanical datum alignment measurements in a Nearfield antenna test range
• Optimized the mechanical and RF hardware performance to 40GHz for the Nearfield Range and Compact Antenna Test Range (CATR) and updated system… Show more
• Optimized the mechanical and RF hardware performance to 40GHz for the Nearfield Range and Compact Antenna Test Range (CATR) and updated system drawings as project requirements changed
• Created a Nearfield system (Orbit/FR) test qualification procedure using a Standard Gain Horn (SGH) at X-band and Ka-band

Tampa/St. Petersburg, Florida Area

• Developed an X-band flat panel SATCOM terminal as the systems engineer and an X-band Block Up-Converter (BUC) and 25W CW SSPA as a design engineer, and authored hardware design specifications.
• System engineer in the development of a Ka-band SATCOM terminal and design engineer for Ka-band Flat Panel antennas; authored hardware design specifications for Ka BUC and 65cm dish antenna from SATCOM requirements.
• Created innovative dual mode X-band band pass filters with greater… Show more
• Created innovative dual mode X-band band pass filters with greater than 100dB isolation using Substrate Integrated Waveguide (SIW), and reduced height waveguide that allowed for the decrease of SATCOM terminal size and.
• Designed X-band and Ka-band SIW, ridge waveguide, and ridge-gap waveguide metamaterial antenna feeds using innovative aperture transitions and phasing for low axial ratio and high gain SATCOM flat panel antenna arrays.
• Created novel full-duplex, shared aperture, circular polarized, stacked-patch antenna arrays for X and Ka-band using a multi-layered PCB approach that reduced design complexity and cost.

• Responsible for all company RF design and test measurements; Managed team of engineers, technicians, and assemblers.
• Designed L-band, X-band and Ku-band Synthetic Aperture Radars (SAR) RF hardware and developed system requirements and specifications documents alongside hardware and system test plans; played an essential part in.
• Designed innovative L-band 1.2kW… Show more
• Designed innovative L-band 1.2kW and X-band 1kW pulsed power amplifiers using chip-and-wire on duroid.
• Designed L-band, X-band and Ku-Band frequency up-converters and coherent oscillator designs.
• Performed Link budget and frequency planning to avoid signal interference and performed L-band phased antenna array pattern tuning and measurements. Show less

• Designed Total Power and Dicke radiometers operating from 13-55GHz using Alumina, MMICs and bond wire.
• Created an Ultra-wide band (UWB) transceiver, filter and antenna, and designed a GPS microstrip antenna.
• Held a key role on the business development team, creating innovative and compelling project proposals.

• Lead engineer responsible for the development of RF circuit simulator models for active and passive COTS RF devices.
• Played an integral role in developing standard operating procedures, model designs, project documentation, and test and measurement set-ups in order to support the expedited pace of a start-up company.

Tampa/St. Petersburg, Florida Area

• A field service technician maintaining and installing Hughes satellite terminal equipment.
• Work included troubleshooting and interpreting terminal error codes, and replacing PCB boards and power supplies, and pointing satellite dish for optimum ENOB at various locations around Tampa Bay Area, FL as needed.
• Computer, computer networking, and printer maintenance work.

Ms, Electrical Engineering, 3.9 Gpa

Microwave circuit design, Electromagnetics, Antenna Design, Power Amplifier design, semiconductors, Digital Circuit Design, Microwave.

Bs, Electrical Engineering, 3.7 Gpa

Communications, WAMIlab, microprocessors, power design, modern physics, analog circuits

Associate Of Science - As, Electrical And Electronics Engineering, 4.0 Gpa

Activities and Societies: Certified technician from International Society of Certified Electronics Technicians (ISCET) Studied analog.