Abstract: In this paper, the development of broadband true time delay technique for phased array antenna in lager scanning angle or wide instantaneous bandwidth scenario is demonstrated. Moreover, on a basis of mathematic derivation, inherent steering dispersive of antenna pattern and complementary of true time delay is implemented. On a basis of delay realization architecture, delay line can be achieved in microwave, surface-acoustic-wave, optical or digital respectively. At the same time, we have focused on the microwave delay line, which include GaAs chip, cable, printed circuit board, and microcoaxial from delay supports. Besides, through the derivation of delay topology circuits, basis branch combined with single delay stub shows superiority on design complexity. Therefore, amplitude or phase complementary needs to be designed carefully, and delay deviation caused by relative permittivity or permeability should be taken into account. Accordingly, though investigation of true time delay technique in domestic and abroad, implementation of broadband true time delay shows inexorable trend for lager scanning angle or wide instantaneous bandwidth applications, which could be proper guidance for array or system design.