Electrically scanned TACAN antenna

An electrically scanned TACAN antenna comprising:

• a reflection plate;
• a monopole antenna provided on an upper surface of the reflection plate and configured to omnidirectionally radiate a signal;
• multiple parasitic radiators arranged around the monopole antenna and configured to operate as reflectors that reflect the signal or directors that direct the signal;
• and
• a controller configured to control parasitic radiators operating as the reflectors to operate as the directors and some parasitic radiators among parasitic radiators operating as the directors to operate as the reflectors at every predetermined timing and choose the some parasitic radiators to be changed according to a preset sequence, and
• wherein the parasitic radiators are circularly arranged at a predetermined distance from each other on donut-shaped first area and second area having concentricity with a location of the monopole antenna, and the second area is farther spaced from the monopole antenna than the first area,
• wherein 16 parasitic radiators arranged in each of 2 rows on the first area have different lengths and different radiation patterns depending on a row in which the parasitic radiators are arranged, and 63 parasitic radiators arranged in each of 3 rows on the second area have different lengths and different radiation patterns depending on a row in which the parasitic radiators are arranged,
• wherein the controller is configured to control parasitic radiators arranged in 1 column operating as the directors among the 16 parasitic radiators arranged in each of 2 rows to operate as the reflectors, and control a parasitic radiator arranged in any one row among the parasitic radiators arranged in the 1 column to operate in any one of two previously divided frequency bands within a preset frequency range for use of TACAN antenna, and
• the controller is configured to control parasitic radiators arranged in 9 columns operating as the directors equally spaced from each other among the 63 parasitic radiators arranged in each of 3 rows to operate as the reflectors, and control parasitic radiators arranged in any one row among the parasitic radiators arranged in the 9 columns to operate in any one of three previously divided frequency bands within a preset frequency range for use of TACAN antenna.