In the past few years, considerable progress has been made in determining the vulnerability of a circuit to microwave radiation. At the same time, much progress has been made in analyzing external coupling. What is currently lacking, however, is a general computer code that can determine the overall… More

Significant progress has recently been made in the development of antennas for radiating Ultra-Wideband (UWB) signals. The radiation characteristics of seferal of these antennas have been recently described in a number of papers. We now propose to apply this theory to practical antennas, to be used… More

Many high-power ultra-wideband (UWB) sources produce a single-ended signal that is fed into a transmission line. Normally, one would like to radiate this signal with an antenna, however, many antennas require a differential mode input. A balun is therefore required to convert the source output into… More

A new class of hydrogen-switched pulsars has been under development recently. These pulsars can have risetimes as fast as 150 ps, peak powers as high as 100 GW, and repetition rates as fast as 1 kHz. Examples such as the "H2" and "H3" pulsars developed by Phillips Laboratory have already been built… More

Bends in waveguides are a problem for high-voltage Ultra-Wideband (UWB) systems. The difficulty arises because only a straight section of standard transmission line can support a pure TEM mode. And a pure TEM mode is necessary to preserve the risetime of the transmitted impulse. When there is a… More

Ultra-Wideband (UWB) systems are currently needed to serve a variety of Navy missions. One of the components of UWB systems that requires much careful thought and innovation is the antennas, since most of the classical antennas are useful only for more narrow bandwidths. Recently, a… More

Bends in waveguides are a problem for high-voltage Ultra-Wideband (UWB) systems. The difficulty arises because only a straight section of standard transmission line can support a pure TEM mode. And a pure TEM mode is necessary to preserve the risetime of the transmitted impulse. When there is a… More

We propose here a ferroelectric trigger for a UWB source with high voltages and operated at high rep rate. This trigger will be simpler and more reliable than existing designs, and will be implemented at lower cost. In addition, this trigger will allow operation at much higher rep rates than… More

The problem of mine detection and location is particularly difficult when the mines are built from a plastic or dielectric material. Metal detectors are able to detect metal mines, but plastic mines blend in very well with the background soil and rocks. A promising approach for detecting plastic… More

We propose a ferroelectric trigger for a UWB source with high voltages and operated at high rep rate. The trigger will be simpler and more reliable than existing designs, and will be implemented at lower cost. In addition, the trigger will allow operation at much higher rep rates than existing… More

Ultra-Wideband (UWB) antennas with broad bandwidth and large apertures could be of great use in a variety of space-based applications, including radar, communications, and surveillance. The challenge is to deploy a large lightweight UWB antenna that isstowable in a small volume, and that will be… More

While explosive munitions are quite effective at causing damage due to blast and fragments, their radius of damage is somewhat limited. We seek here to introduce a method of increasing the damage radius by adding an RF weapon system to the munition,consisting of an impulse source and a broadband… More

For companies engaged in the development of new antenna designs, antenna measurement systems represent a huge initial cost, and a significant barrier to entry into the market. Antenna measurement systems typically use a frequency domain Vector NetworkAnalyzer (VNA) and anechoic chamber or large… More

For companies engaged in the development of new antenna designs, antenna measurement systems represent a huge initial cost, and a significant barrier to entry into the market. Antenna measurement systems typically use a frequency domain Vector NetworkAnalyzer (VNA) and anechoic chamber or large… More

"Compact Ultra-Wideband (UWB) antennas with broad bandwidth could be of great use in a variety of space-based applications, including radar, communications, and surveillance. The challenge is to deploy a lightweight UWB antenna that is stowable in a smallvolume, that is automatically deployable, and… More

"On the modern electronic battlefield, a weapon that disables the enemy's electronics can be more useful than a weapon that executes a killing strike. This is possible because a radio frequency (RF) weapon that attacks electronics can be effective over amuch larger radius than a high-explosive (HE)… More

"High-voltage Ultra-Wideband transmitters are a key component in a wide variety of systems involving directed energy weapons, UWB radar, and secure communications. These applications require a UWB transmitter that combines a portable high-gain antenna witha fast-risetime high-voltage triggered… More

"Lens antennas with large apertures could be useful in a variety of High-Power Microwave (HPM) and Ultra-Wideband (UWB) applications. Such lenses are needed in the frequency range of 0.2-2 GHz, and they must have low loss and dispersion. Existing lensesmade of solid dielectric materials, such as… More

Ultra-Wideband radar systems could contribute significantly to the detection and identification of unknown objects. UWB radars have been shown to work well in environments where conventional radars fail, such as looking through foliage or soil. However,UWB radars suffer from the lack of an antenna… More

Ultra-Wideband (UWB) radar systems will be useful for remote target identification, especially when looking through foliage, rain, or soil. The current state of the art, however, requires two separate antennas, one each for transmit and receive. Becausethe space available for antennas is limited, it… More

Ultra-Wideband antennas are a critical component of Ultra-Wideband communications and surveillance systems. Such antennas must cover a bandwidth of 20 MHz to 4 GHz, be omnidirectional, and be convenient to transport and deploy. We consider here how tomodify existing two antennas, the Impulse… More

The detection of reentry vehicles with missile seekers is a particularly challenging problem due to the high speed of incoming targets and the clutter they normally emit to confuse enemy radar. Advanced missile seekers using Ultra-Wideband (UWB) radar haveshown much promise for distinguishing… More

Ultra-Wideband radar systems have already demonstrated an ability to detect and locate non-cooperative targets. Existing systems, however, are clumsy to use because they require two separate antennas for the transmit and receive channels. Because the antennas are large, it is challenging to mount… More

Airborne UWB radar systems will require a receive antenna that can be printed or mounted onto the inflatable wing of an Unmanned Aerial Vehicle (UAV). Such antennas need to reach as low as VHF frequencies, and must be positioned to look to the side of the aircraft. To satisfy this requirement,… More

We consider here antennas and sources for radiating high-power ultra-wideband (UWB) electromagnetic impulses from extremely compact and durable packages. Such a device will have applications either as a part of a UWB radar system or as an electromagnetic weapon. A need exists for an antenna that can… More

Antennas for radiating high-power mesoband electromagnetic signals are critical to the mission of upsetting electronics at a distance. High Power Microwave (HPM) weapons require highly efficient antennas that can fit into a small volume. An example of such an antenna is the half Impulse Radiating… More

High-Power Microwave fields between 500 MHz and 1 GHz can upset electronic equipment at a considerable distance. However, it remains challenging to find a suitable high-power microwave source for such fields. Such devices should have a bandwidth of 10-15%, reasonable efficiency, low cost, compact… More

High-Power Microwave fields with frequencies near 1 GHz have been shown to upset electronic equipment at a distance. The challenge lies in finding a high-power source that provides a pulse of continuous-wave power 20-30 ns in length, with reasonable efficiency, low cost, small size and mass, and… More

Many aircraft are hardened against the effects of various forms of various high power electromagnetic waves, including EMP, HPM, and HIRF. These aircraft typically have electrically conductive screens built into their windows, with an electrical connection to the metallic fuselage that forms an… More

Many aircraft are hardened against the effects of various forms of high power electromagnetic waves, including Electromagnetic Pulse (EMP), High Power Microwaves (HPM), High Intensity Radio Frequency (HIRF), and lightning. These aircraft typically have electrically conducting coatings on their… More