Analysis of SLL at UWB scanning array based on TTD BFN

A beam scanning technique is developed with a TDD (true time delay) for UWB (Ultra Wideband) arrays. The performance of SLL (Side Lobe Level) for this kind of array based on TDD BFN (Beam-forming network) will analysis and discussed. In addition, we give a formulation for the time domain array factor for UWB antenna arrays. An UWB comb taper slot antenna array with large element spacing and impulse excitation is studied and four-element UWB linear array system with element spacing of 18 cm and 20 degree scanning is implemented. The voltage response and energy pattern for from simulation and measurement are in good agreement. The periodic grating lobes of the UWB antenna array do not occur in the energy pattern, even if the element spacing and scan angle are large. Simulation and measurement results for the energy pattern and voltage response in various directions are studied to validate the theory of an UWB antenna array with scan capability.