Various wideband antennas have been interesting subjects in antenna designs and have found important applications in military and civilian systems. For examples, the super-wideband (SWB) antenna is a key component of electronic counterwork equipment in the information warfare; while the ultra-wideband (UWB) antenna is widely used in impulse radar and communication systems. With the development ...

Exploration of poorly known regions of the Brazilian coast has resulted in the discovery of a new species in the scale worm family Pholoidae. Pholoe microantennata sp. nov. occurs at the Campos Basin (states of Espirito Santo and Rio de Janeiro) and along the northern coast of São Paulo State. It differs from other species in the genus because it has numerous large and conical marginal papillae...

The ultra wide band antennas are required in applications where larger bandwidth for the transmitting signal is needed. They cover wide bandwidth in the range from 500 MHz to the frequencies above 8000 MHz. In this paper, a review of various techniques to realize ultra wide band microstrip antennas (MSA) is presented. They are realized by using different techniques like basic planar monopole an...

Cassegrain Reflector Antenna Design consists of various effects caused by blockage and its effect on overall performance. The design for minimum blockage condition results in geometry that offers lower amount of blockage and increased spillover past the subreflector. To avoid this, optimized design of the antenna results in geometry that offers lower amount of spillover past the edges of the ma...

The environment of confined spaces such as tunnels and coal mines is complex changeable. When the wireless signal propagates in it, it will be affected by reflection diffraction shaft wall, which puts forward higher requirements for radiation beam mine antenna. In this paper, corrugated horn antenna model selected to design a whose pattern almost equal Gaussian beam. Starting from expression be...

This letter introduces a technique for the power density (PD) pattern measurement in near field taking into account antenna/body coupling at millimeter waves (mmW). The proposed method employs specifically designed structure reproducing reflection coefficient from human skin. is optimized to convert absorbed PD an infrared (IR) pattern, remotely recorded using high-resolution IR camera reconstr...

This paper deals with the estimation of trajectory a target in constant velocity motion at an unknown depth, from measurements conical angles supplied by linear array. Sound emitted does not necessarily navigate along direct path toward antenna, but can bounce off sea bottom and/or surface. Observability is thoroughly analyzed to identify ghost targets before proposing efficient way estimate in...