High Quality Content by WIKIPEDIA articles! A passive radiator or parasitic element is a radio antenna element which does not have any wired input. Instead, it absorbs radio waves radiated from a nearby active antenna element, and re-radiates it. To the extent the current in the parasitic element leads or lags that of the active element the parasitic element can reflect or direct the signal. This changes the antenna pattern and beam width.Parasitic elements can also be used to alter the radiation parameters of nearby active elements. An example of this is to place a parasitic microstrip patch antenna above another driven patch antenna. This antenna combination resonates at a slightly lower frequency than the original element. However, the main effect is to greatly increase the impedance bandwidth of the antenna. In some cases the bandwidth can be increased by a factor of 10.

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