Microstrip reflectarrays: Full-wave analysis and design scheme

An analytical approach and a design scheme based on a highly efficient full-wave analysis technique CG-FFT (conjugate-gradient fast Fourier transform), are presented for accurately analyzing large microstrip reflectarrays in a very detailed manner throughout the whole design procedure. A trial microstrip reflectarray has been designed using the proposed approach. It was then constructed and tested. The experimental results are compared with the simulated results. It is considered that, to get an accurate focus point of the microstrip reflectarray, it is crucial to know the precise phase shift of the reradiated field of each single patch in the array caused by the connected short transmission lines.<>