Abstract---A slotted waveguide providing a two dimensional near-field focused beam is presented in this paper. This antenna focuses the beam in the E-plane and provides a wide beam in the H-plane in order to illuminate a linear array, as reflect-or transmit-array antenna with a small width (100mm) and a very large length (1530mm) located in the near-field region. The simulated field distribution on the array is found to be in very good agreement with the measurement of a prototype at 9.41GHz.

Abstract-Based on technical analysis and budget link experimentation, the main purpose here is to show improvement of HF half loop antennas in terms of signal-to-noise ratio (SNR) and stealthy for a combat ship. A special designed HF antenna brings a high quality communication over 1000 NM. A suitable integration of a HF half loop antenna at ship corners contributes to the ship stealthy. This paper shows the antenna performance and the benefit of the completely body integrated HF half loop antenna regarding whip antennas. The corresponding SNR is 15 to 20 dB better than for a conventional antenna.

Abstract-This paper presents a new method in order to estimate the Radar Cross Section (RCS) of large objects in their environments. Object is defined as a volumetric surface and will be considered as a metallic target at a finite distance. This estimation is based on the use of dyadic Green's function method which includes near-field issues. Simulations have been made in a frequency band between 1 to 20 GHz. Some simulated results of RCS estimation of a large metallic target taking into account the sea effect, are presented.