Patent ID: 7653501

Claim:
An apparatus for determining a diameter of a reflector antenna, comprising: a setting means for setting up electrical characteristic values of the reflector antenna upon receipt of the characteristic values from outside; a parameter input means for receiving a frequency, an antenna diameter variable value, antenna efficiency, Edge Taper (ET), and an Edge Of Coverage (EOC) angle as parameters for each of multiple frequencies to be accommodated in the reflector antenna; a graph generation means for generating, on one rectangular coordinate, a graph representing the relationship between an antenna diameter and EOC directivity with respect to the EOC angle based on the parameters for each frequency received through the parameter input means; an antenna diameter determination means for determining an antenna diameter that simultaneously meets the preset EOC directivities for the frequencies to be accommodated in the reflector antenna by using the graph generated by the graph generation means; and a graph output means for mapping and outputting the graph generated by the graph generation means on one rectangular coordinate with an antenna diameter axis and an EOC directivity axis to thereby represent the antenna diameter determined by the antenna diameter determination means on the graph.