A.G. Pino

An omnidirectional dual-shaped reflector antenna

A dual-shaped reflector antenna with an omnidirectional pattern and vertical polarization is presented. A radial-mode conical feed illuminates a rotationally symmetric dual-shaped reflector system able to drive the main beam in a nearly horizontal direction and able to control both the main lobe direction and its pattern.xa0© 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 371–374, 2000.

A segmented approach for computing the electromagnetic scattering of large and deep cavities

This paper describes a new method for analyzing the high-frequency EM scattering from large open-ended cavities. Iterative solutions based on Physical Optics (PO), such as the Iterative Physical Optics (IPO) or the Progressive Physical Optics (PPO) method, have proved to be efficient techniques for computing the scattering of relatively shallow cavities. In order to improve the efficiency for deep cavities a segmented approach is proposed. In this technique the cavity is split into several sections and the magnetic field integral equation (MFIE) is solved independently for each of them, using either IPO or PPO to obtain their scattering matrices. The response of the whole cavity is found via a connection algorithm which leads to evaluate a generalized reciprocity integral over a surface close to the cavity end. This approach reduces drastically the computational cost with respect to both IPO and PPO methods, mainly for deep cavities. Some numerical results are compared with a modal reference solution to d...

Hybrid GMT-MoM method for solving electromagnetic scattering problems

Th method of moments (MoM) is combined with the generalized multipole technique (GMT) to analyze electromagnetic scattering problems. The proposed hybrid method GMT-MoM improves the results obtained by GMT and reduces the computational effort in comparison with conventional MoM techniques. Current density distributions have been obtained for a two dimensional scatterer illuminated by either a TM or TE near field source, showing the accuracy and effectiveness of this hybrid approach.

Pattern synthesis of array antennas in presence of dielectric bodies

A method for synthesizing the pattern of an array antenna in the presence of dielectric environmental objects is presented in this paper. This method includes and even takes advantage of the radiation from all the scatters, allowing the optimal array coefficients to be obtained when the presence of the obstacles is considered. The electromagnetic behavior of the obstacles is modeled with the method of moments. Some results are presented to illustrate the efficiency and accuracy of the proposed method.

A single shaped‐reflector antenna with wide‐geostationary‐arc field of view

A nonexpensive single shaped-reflector antenna for the reception of signals coming from different satellites in separate orbital locations along the geostationary orbit is presented. Two different solutions for a two-satellite scenario or uniform antenna performance for any satellite in a wide arc of the geostationary orbit are presented.xa0© 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 216–219, 2001.

A block-iterative algorithm for multi-object scattering problems

A block iterative algorithm is proposed to solve electromagnetic scattering problems involving multi object scatters. The problem is formulated using a hybrid method, which combines the generalized multipole technique (GMT), and the method of moments (MoM). The proposed algorithm shows a very fast convergence, mainly when the iteration is performed in an adequate sequence. This sequence can be easily found using empirical rules based on geometrical considerations. Some results are presented in order to show the efficiency and accuracy of the proposed method.