Non-uniform description of short CRLH Leaky Wave Antenna with the Generalized Array Factor Approach

Abstract

Radiation-patterns of short uniform CRLH LWA of various lengths have been computed. They show differences from the "array factor approach" predictions which cannot be explained by this model. Better results are achieved if we consider non uniform distributions of the leakage and propagation constants along the line. Non uniform distributions are determined by an empirical method based on the generalized array factor. The origin of this phenomenon is discussed and compared to the case of small array antennas.

Generalized Array Factor Approach to the Assessment of Discrete Tapered Nonuniform Leaky-Wave Antenna

“…In this case, even for smooth variations of the UC geometry, the values of α and β are showing important deviations from their equivalent uniform infinite line counterparts and are not precise enough for a direct design [23]. A more complex design procedure based on numerical methods is then required [24].…”