A phased array antenna (400) comprises a first array element (402) and second array element (404) and a dielectric separator (408). Each of the first and second array elements (402,404) is a detection element and or an emitter element. The dielectric separator (408) is located between the first and second array elements (402, 404) and within a path of an inter-element mutual coupling (IMC) signal between the first array element (402) and the second array element (404).