The design of a vertically polarized antenna array used for the suppression of Es layer clutter

There has Es layer clutter in the high frequency surface wave radar, and the Es layer clutter has the difference arrival direction with the signal. So a vertically polarized antenna array whose mainlobe is put on the reverse direction of the signal arrival direction and a low sidelobe is put on the direction of the signal arrival direction, can be added as auxiliary antennas in the high frequency surface wave radar system to suppress the Es layer clutter. The clutter-to-signal ratio in the outputs of the auxiliary antennas will affect the suppression of the Es layer clutter in the main antennas. The bigger of the clutter-to-signal ratio in the outputs of the auxiliary antennas, the better suppression result of the Es layer clutter in the main antennas can be achieved. Used the superdirective synthetically method, the auxiliary vertically polarized antenna array will have a lower gain on signal than the main antenna, when it can maintain the same gain on Es layer clutter as the main antenna. So the clutter-to-signal ratio in the outputs of the auxiliary vertically polarized antenna array will be increased, the suppression of the Es layer clutter in the main antennas which use the vertically polarized antenna array as auxiliary antenna will be more effective.