| 摘要 |
<p>PURPOSE:To avoid the jamming of a radio wave, by mounting a plurality of antennas, a frequency oscillator for oscillating two or more kinds of frequency radio waves and a circuit element for adding a transmission signal and the frequency radio waves to send the same to said antennas while applying phase shift control. CONSTITUTION:(n+m) antennas 4 are connected to a transmitter 1, an add34 2 emitting a receiving signal and (n) local oscillators 3 outputting two or more kinds of different frequencies f1...fn. An adder 5, an amplifier 6, a mixer 7 and a phase shifter 8 are arranged at every antenna 4 and each phase shifter 8 is connected to a beam control computer 9. In this constitution, the signal from the transmitter 1 is given to the adder 5 at every antenna 4 to be added to the signal from each of the oscillators 3 by the adder 5 to become a radio wave signal of transmission frequency and said radio wave signal is sent to the phase shifter 8 through the amplifier 6 to be further sent to the antenna 4. Each phase shifter 8 is controlled in phase shifting by the computer 9 and the radio wave signal sent from each of the antenna 4 becomes each of signals f1-1, f2-2...fn-m controlled in phase shifting.</p> |
