Design of Arrays Giving Prescribed Radiation Patterns

Software for Synthesis of Radiation Patterns by Linear Antenna Arrays

This paper presents the characteristics of a software developed on MatLab Scripts to obtain the synthesis of radiation patterns, using linear antenna arrays. Several classical techniques have been considered such as Schelkunoff method, Fourier series and transform methods, Woodward-Lawson method, Taylor line-source methods. In all those cases, algorithms were developed and the results agree wit...

Patterns of Household Charitable Giving

Executive Summary The Center on Philanthropy at Indiana University and Google partnered in early 2007 to estimate how much of the charitable giving by households in the U.S. focuses on the needs of the poor. This analysis finds that less than one-third of the money individuals gave to nonprofits in 2005 was focused on the needs of the economically disadvantaged. Of the $250 billion in donations...

Software for Calculating Radiation Patterns for Linear Antenna Arrays

This paper describes the characteristics of a software developed on MatLab Scripts to obtain the radiation patterns of linear antenna arrays using dipoles as the elements. The software includes, among several other options: the analysis and design of arrays with progressive phase, arrays with non uniform amplitude excitation and arrays with non uniform separation. Some special attributes of the...

On analytic design of loudspeaker arrays with uniform radiation characteristics

Some notes on analytical derived loudspeaker arrays with uniform radiation characteristics are presented. The array coefficients are derived via analytical means and compared with so-called maximal flat sequences known from telecommunications and information theory. It appears that the newly derived array, i.e., the quadratic phase array, has a higher efficiency than the Bessel array and a flat...

Health giving patterns of philanthropic foundations.