&lt;title&gt;Powerful ultrawideband rf emitters: status and challenges&lt;/title&gt;

Agee, F.J.; Scholfield, D.W.; Prather, W.D.; Burger, J.W.

doi:10.1117/12.218594

Cited by 17 publications

(12 citation statements)

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“…The BASS TM device is extremely compact, and several of them can be switched with sub-100 ps rise time performance using a GaAs laser diode coupled to an optical fiber splitter. Additionally, these devices achieve 10 ps rms jitter and greater than 3 10 shot lifetime, making them particularly suitable for parallel arraying to achieve greater current handling capability. The maximum switch gap is constrained by optical absorption and thermal dissipation in the GaAs, thereby capping the voltage hold off to about 17 kV.…”

Section: B Photoconductive Solid-state Switched Arraysmentioning

confidence: 99%

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Ultra-wideband transmitter research

Agee

Baum

Prather

et al. 1998

IEEE Trans. Plasma Sci.

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The generation of ultra-wideband (UWB) pulses is a challenging problem that involves generating pulses with fast rise times on the order of 100 ps and voltages of more than 500 kV. Pulsewidths from 130 ps to a few nanoseconds (ns) are possible. A critical step involves switching high voltages with precision. The use of both gas and oil for the switching medium has been accomplished with varying results. The Air Force Research Laboratory (AFRL) is pursuing both media in the gas-switched H-series of pulsers and in studies of oil switches that promise good performance in compact packages. We are also pursuing solid-state switched systems that have demonstrated the potential for use in compact systems and in transient antenna arrays with steerable beams. This paper reviews recent progress in fast, high voltage switching and UWB transmitter development. These UWB pulsers and antennas have the potential for use in transient radar, target identification, and communications. Index Terms-Brewster angle window, gas switch, high power microwave, impulse radiating antenna, oil switch, photoconductive solid-state switch, radio frequency lens, silicon avalanche shaper, spark gap switch, transient antenna, ultra-wideband. I. BACKGROUND U LTRA-WIDEBAND (UWB) sources and antennas are of interest for a variety of potential applications that range from transient radar systems to communications systems. Predating the recent technology developments of the last several years were a number of important discoveries in the 1980's that led to the first UWB pulsers capable of transmitting high peak field signals through a variety of antennas. The Bournlea pulse generator is a good example of an instrument that is capable of fast rise times and a high repetition rate [1]. Using a CX1599 hydrogen thyratron as its basis, the original Bournlea pulser, made in 1986, could produce a 5-kV pulse with a rise time of 3 ns and a pulse repetition frequency (PRF) Manuscript

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Section: B Photoconductive Solid-state Switched Arraysmentioning

confidence: 99%

“…Ultra-wideband technology is of current interest to the Air Force Research Laboratory (AFRL) where research efforts have been underway for a number of years [3]- [5]. 1 Sandia National Laboratories (SNL) has also produced a number of UWB sources and solid-state devices that have demonstrated substantial increases in power and repetition rates [6]- [10].…”

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confidence: 99%

Ultra-wideband transmitter research

Agee

Baum

Prather

et al. 1998

IEEE Trans. Plasma Sci.

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“…Some of these sources can produce repetitive ns pulses with sub-nanosecond rise time and peak electric field intensity in several hundred kV/m [Agee et al 1995]. At much lower power, an example of forthcoming civilian UWB radar application is in the automobile device for obstacle avoidance.…”

Section: Studies On the Biological Effects Of Ultra-wide-band Pulsesmentioning

confidence: 99%

“…Endpoints of studies were cardiovascular response in rats, equilibrium task performance of monkeys, performance scores of the Functional Observation Battery (29 physiological and behavioral measures) in rats, serum enzymes, plasma electrolyte concentration, hemoglobin concentration in rats, brain C-fos protein activation in rats, and metrazole seizure activity in rats. The exposure was with a "ffindenburg-2" (H-2) device, which was developed in mid-1992 [Agee et al 1995] and produced bipolar pulses at 250 kV/m (166 MW/m 1 ) peak electric field intensity, 318-377 ps rise time and 5-10 ns pulse duration. Typical exposure was 2 min at 60 pps except the operant behavioral study in which rats were tested immediately after an exposure to 12,000 pulses in a "sweep" pulse repetition, starting at 1 pps and increased continuously to 400 pps in 1 min.…”

Section: Studies On the Biological Effects Of Ultra-wide-band Pulsesmentioning

confidence: 99%

Services to Operate and Maintain the Microwave Research Facility at Brooks Air Force Base, San Antonio, Texas

Akyel¹

2001

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“…The second approach employs many radiating elements (array UWB source) switched at relatively low voltage to collectively deliver an additive field at the target of the array. The photoconductive semiconductor switched (PCSS) array method has been employed and demonstrated in the systems such as GEM series of pulsers at the U.S. Air Force Research Laboratory [4]. In addition to the military applications, such UWB schemes can provide nonintrusive probe of human body for medical treatments if suitable electric strength can be arranged.…”

Section: Introductionmentioning

confidence: 99%

Low-Impedance Compact Modulators Capable of Generating Intense Ultra-fast Rising Nanosecond Waveforms

Collins¹,

Davanloo²

2006

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<title>Powerful ultrawideband rf emitters: status and challenges</title>

Cited by 17 publications

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Ultra-wideband transmitter research

Ultra-wideband transmitter research

Services to Operate and Maintain the Microwave Research Facility at Brooks Air Force Base, San Antonio, Texas

Low-Impedance Compact Modulators Capable of Generating Intense Ultra-fast Rising Nanosecond Waveforms

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