Analysis of a dual-frequency array technique

This paper describes the radiating properties of a new element for a dual-frequency phased array that operates over two frequency bands separated by about an octave. The analysis considers the array element excited by two waveguides for high-frequency operation, and includes an evaluation of the element radiation properties at both frequency bands. The analysis of radiation is carried out for the case ofH-plane scan, which is expected to be the most severe test of the element's scanning behavior. Computed results indicate that the structure radiates efficiently within the two bands and operates free from anomalous behavior over substantial scan angles. These results demonstrate the feasibility and practicality of the basic concept.