Microstrip reflectarray antenna program

Results of a study to determine the feasibility and design limitations of a microstrip reflectarray antenna are presented. This antenna, which has been proposed as a means to provide potential low-cost corporate-fed phased arrays, utilizes microwave integrated circuit techniques to integrate the radiating element, phase-shifter components, dc distribution, and logic circuitry into a single structure. The report contains design and performance data on such an element operating at 3 GHz. The performance was measured using a waveguide test fixture to simulate the array. Fundamental element performance is in agreement with the results of supporting analysis. The usefulness of the element in an array is severely restricted by very narrow bandwidths and relatively high losses. However, supporting theoretical analysis showed the element's loss and operating bandwidth are a strong function of the element spacing in an array environment. Results indicate reduced loss and increased bandwidth with decreased spacing, thereby suggesting that the present performance deficiencies could be overcome.