H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/19
H01Q 3/26 (2006.01) G01S 1/54 (2006.01) H01Q 3/34 (2006.01)
Patent
CA 1047159
ABSTRACT An antenna and scanning means therefor particularly use- ful in an aircraft landing system operating in the microwave frequency range. The antenna is of the line phased array type which includes digitally controlled phase shifters for each of the radiating elements of the array. The beam formed by the antenna is steered by incrementing the phase shift applied at each of the array radiating elements by an amount of phase which is dependent in part upon the position of the radiating element in the array. Phase increments sufficient to shift the beam position by one coarse step (0.01°) are supplied to symmetri- cally located radiating element pairs, pair by pair, until all elements have been incremented. The beam is thereby caused to move through one coarse step in a number of fine steps equaling the number of pairs of elements in the array. An additional feature of the scanning means is the application of phase in- crement to the array elements in a pseudo-random sequence.
238859
Jaeckle Wilfried G.
Moeller Alvin W.
Paskalakis Lucas G.
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