| 摘要 |
PURPOSE:To reduce the side lobe by giving the specific control to the input signal phase and the phase shift degree of a phase shifter and at the same time to suppress the rise of the side lobe by carrying out the switching to an equal phase line when the beam is at the front for an electronic scanning antenna using plural phase shifters. CONSTITUTION:Phase shifters 2a-2n are connected to element antennas 1a- 1n, and phase shifter driving circuits 3a-3n which are controlled by a control circuit 5 are provided. At the same time, the signals of a transmitter 7 and a receiver 8 are applied to the shifters 2a-2n via a transmission/reception switch 6 through phase controllers 9a-9n to control the main beam direction. The input signal phase of the phase shifter 2 is controlled 9 as shown by the expressionI, and the phase shift degree is controlled 5 like the expression II. The marks of the expressionIand II are defined as the formula III. Thus the side lobe of a specified direction due to the equalized phase error can be reduced. Furthermore the controllers 9a-9n are switched to equal phase lines 12a-12n when the beam is at the front to set the phase shift degrees of the shifters 2a- 2n at an equal phase. Thus the rise of the side lobe can be suppressed. |
