Synthetic Aperture Radar (SAR) has been widely used for remotely sensed on Earth for decades. The advantages of SAR are to provide all weather and all day capability imagery and can be complemented with optical images. In considerations of the applications of SAR, user needs, mission definitions and critical technology preparations, a development of the X-band SAR program was planned and enforc...

Gradient index lens antennas find their application in modern wireless communication including radar systems, satellite communication, etc. They can ensure highly directional beamforming, support multibeam operations and beam steering capabilities within a wide angle of view. The development 3D printing technologies enables the implementation complex gradient refractive distribution with high a...

in this paper a new low profile substrate integrated waveguide (siw) probe-fed h-plane horn antenna structure with improved gain is proposed. the proposed antenna consists of two waveguides including a rectangular and a taper one, in which both, first and third modes of the structure are simultaneously excited leading to a uniform field distribution along the radiating aperture of the antenna a...

Several multibeam sonar systems are now capable of collecting and recording data samples covering the full-watercolumn, not just the seabed. Such systems, while still facing hardware challenges such as limited dynamic range and bandwidth, collect vast quantities of data, generally an order of magnitude more than conventional hydrographic multibeam or scientific single beam sonar systems. In thi...

This paper studies the precoder design problem of achieving max-min fairness (MMF) amongst users in multigateway multibeam satellite communication systems with feeder link interference. We propose a beamforming strategy based on newly introduced transmission scheme known as rate-splitting multiple access (RSMA). RSMA relies multi-antenna at transmitter and successive interference cancellation (...

This paper investigates the performance of integrated wireless sensor and multibeam satellite networks (IWSMSNs) under terrestrial interference. The IWSMSNs constitute sensor nodes (SNs), satellite sinks (SSs), multibeam satellite and remote monitoring hosts (RMHs). The multibeam satellite covers multiple beams and multiple SSs in each beam. The SSs can be directly used as SNs to transmit sensi...

The authors present the first results obtained with their multibeam scanning electron microscope. For the first time, they were able to image 196 array of 14 14 focused beams of a multielectron beam source on a specimen using single beam scanning electron microscope SEM optics. The system consists of an FEI Novanano 200 SEM optics column equipped with a multielectron beam source module. The sou...