What type of antenna has two or more antenna elements connected to the feed line?

A phased array antenna is characterized by having two or more antenna elements connected to a common feed line. This configuration allows for the manipulation of the phase of the signals emitted by each individual element, enabling the antenna to steer its beam direction without moving the physical structure. This capability is particularly advantageous in applications such as radar systems or advanced communication systems where tracking moving targets or changing signal directions quickly is essential.

In a phased array, the ability to change the phase differences between the elements results in constructive and destructive interference patterns, effectively controlling the direction of the radiated beam. This contrasts with other antenna types, which may consist of a single element or fixed directional characteristics. Hence, the multiple elements and their phase control capability are what distinctly identify the phased array antenna.