| 摘要 |
<p>A method for optimising the design of a multi-element antenna array to achieve a predetermined variation in radiated power with elevation includes making a first estimate of the array size and number of elements based on the predetermined variation in radiated power with elevation and a desired azimuth beamwidth at a predetermined operating wavelength, selecting a maximum difference between desired and actual array gain, making a first estimate of the voltage and phase of the signal to be fed to each element of the array, calculating an elevation pattern for the first estimate for at least one azimuth angle, optimising the phase and power distribution between the elements by comparing the calculated elevation pattern with the desired predetermined pattern and if the difference is greater than the selected maximum difference, adjust the phase and/or voltage of the feed to at least one of the elements to reduce the difference and repeat the calculating and optimising steps until the difference is less than the selected maximum difference, calculating the loss of gain at maximum range compared to an equivalent-sized array having elements fed in-phase with equal power, optimising the array size by repeating the voltage and phase estimating step, the elevation calculating step and the phase and power optimising step for different array sizes, and selecting the size having the least reduced gain.</p> |
