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HPM Effects and Sources (E&S)

Dr. John Rodgers

Institute for Research in Electronics and Applied Physics (IREAP)

rodgers@umd.edu

Students & Post docs: Mike Holloway (DEPS Scholar), Todd Firestone, Colin Kennedy, Arlene Wangia & Dr. Zeynep Dilli

Faculty: Profs. Granatstein, Antonsen, Ott & Anlage; Drs. Nusinovich, Shkvarunets & Sinitsyn

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Overview of HPM Effects Research

Mapping of Electromagnetic Fields

Power Supply

Power Bus

EMI Gasket

HPM Effects Involve:

•Complex field distributions that are very sensitive to changes in the system

•Circuit response that is very sensitive to the HPM waveform characteristics (amplitude, frequency, pulse length, modulation bandwidth, etc.)

•Critical scaling laws as IC technology advances

Nonlinear Circuit

Dynamics

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HPM Effects Spectrum

• Electronic systems may be susceptible to HPM anywhere across the 200-5000 MHz frequency band.

• Achieving high probability of effect requires wideband sources capable of:– 10 MW powers and kJ pulse energies for close range

applications (e.g. vehicle stopping & IED defeat)– 100 MW powers for long ranges (e.g. missile defense).

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Frequency (GHz)

DC

Vol

tage

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et (V

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RF

Am

plitu

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DC_VoltageRF_Ampl

HPM

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Previous HPM Effects Studies

• We have made great strides in understanding the basic electronics of HPM upset in circuits.

• Our new models yield fast, accurate predictions using commercial circuit simulators (e. g. ADS).

HPM Effects Circuit ModelComparison of results from

experiments and simulations

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Proposed AppEl Research: HPM E&S

• Comprehensive HPM effects program– Study HPM effects in electronic systems– Design highly effective HPM waveforms– Develop wideband test sources– Deliver accurate systems effects models– Support DE efforts @ NSWC and AFRL

DigitizingScope

SpectrumAnalyzer(Existing)

20 dBRF Amplifier

20 dB

Device UnderTestBias Tee

ProgrammablePulsed RF Source

BasebandInput

Signals

RF InputSignals

DigitizingScope

BasebandFilter

BasebandOutputSignals

RF OutputSignals

Control/Data AcquisitionWorkstation

Instrument Control and Data Bus

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Proposed AppEl Research: HPM E&S

• Comprehensive HPM effects program– Study HPM effects in electronic systems– Design highly effective HPM waveforms– Develop wideband test sources– Deliver accurate systems effects models– Support DE efforts @ NSWC and AFRL

AppEl @

Proposed AppEl Research: HPM E&S

• Comprehensive HPM effects program– Study HPM effects in electronic systems– Determine the most effective HPM waveforms– Develop wideband test sources– Deliver accurate systems effects models– Support DE efforts @ NSWC and AFRL

Wideband HPM Source

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Proposed AppEl Research: E&S

• Comprehensive HPM effects program– Develop wideband test sources– Study HPM effects in electronic systems– Design highly effective HPM waveforms– Deliver accurate systems effects models– Support DE efforts @ NSWC and AFRL

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Proposed AppEl Research:DE, mm & m Wave Sources

• Directed Energy Sources– Harmonic gyrotrons for ADS, advanced radar, EW

• Terahertz Electronics– Remote sensing, high-speed communications

35 GHz Harmonic Gyrotron 35 GHz Harmonic Gyro-amplifier

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Proposed AppEl Research: Rail Guns

• Investigate innovative methods for storing and releasing magnetic energy.

UMD Coaxial Gun

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AppEl Extension & Education

• NSWC Dahlgren & JNLWD has expressed an interest in developing our wideband chaotic HPM sources for effects testing.

• Internships for USNA Trident Scholars

• DEPS Graduate Scholarships

• REU Internships