An ultra-wideband high-power solid-state transmitter for electronic warfare applications which includes a plurality of wideband Gallium-Nitride (GaN) semiconductor monolithic-microwave integrated circuits (MMICs), a spatial power combiner to sum the aggregate contribution of the MMICs, a wide bandwidth small form factor driver amplifier module to supply the required gain in the transmitter, and a thermal management system.

There may be provided a method for inducing a disruption to an operation of an unmanned aerial vehicle (UAV) that communicates with a remote controller, said method may include determining to induce the disruption to the operation of the UAV; and transmitting, to the UAV, one or more disrupting commands that once executed by the at UAV causes a unit of the UAV to malfunction, the malfunction induces the disruption to the operation of the UAV.

Embodiments of communication systems are disclosed for protecting communication between an implanted device ID and an external device ED. Optionally, the ID communicates over the TET channel by modulating a load on the channel. While the ID is communicating the ED optionally adds noise to the TET channel, inhibiting malicious interception of the communication. Using knowledge of the noise signal, the ED cleans the noise from the TET signal to recover the communication from the ID. In some embodiments, the TET link is used to pass an encryption key and/or to verify communications over a radio channel. The TET channel may be authenticated. For example, authentication may include a minimum energy and/or power transfer.

We disclose a novel methodology and wireless network for covert wireless RF communications between an agent device and a client device in the presence of an adversary device which attempts to detect the existence of the transmission of the RF communication between the agent and client. The methodology comprises: providing an intelligent reflecting surface (IRS) to reflect wireless radio frequency (RF) communication signals transmitted from the agent device to the client device, the IRS comprising a two-dimensional array of individually controllable RF reflecting elements; providing a jamming device which radiates jamming signals with random power to confuse the adversary device in detecting the existence of the communication between the agent device and the client device; and establishing a covert RF communication link between the agent device and the client device using the IRS that optimizes the transmission probability, transmit power at an agent, and the reflection matrix of an IRS for covert RF communications.

A method and apparatus are provided for directional communication systems in tactical environments, utilizing frequency-hopping signals to enhance low-probability-of-intercept, -detection, and -geolocation (LPI/LPD/LPG) performance; along with anti-jamming (AJ) performance, multiple access, and performance in multipath channels. Because frequency-hopping signals vary their radio frequency from dwell-to-dwell, this prevents conventional angle-of-arrival (AOA) estimation based on phase-differences. This disclosure presents a technique for AOA estimation for frequency-hopping signals with techniques for combining phase-difference measurements from multiple frequency-hopping dwells to achieve high-performance AOA estimation.