DIRECTIVE DIAGRAMS OF ANTENNA ARRAYS 305 



A model of tlu' upper half ol" ihe space characteristic of an array 

 of four antennae located at the corners of a square is shown by Fig. 11, 

 each side of the square having the parameters (|X, 07'). Below the 

 model is shown the directive diagram in the i^lane of the eirray, whicii 



Fig. 11— Model of the space characteristic for an array of four antennae located 



at the corners of a square, with a separation of one-half wave-length between antennae 



on each side of the square, and with zero phase difference 



is identical with the base of the model, together with a representation 

 of the array itself. In the horizontal plane the maximum ampli- 

 tude is slightly less than 1/5, occurring along the diagonals of the 

 square; the amplitude reaches its absolute maximum of unity only 

 in the vertical direction. 



