| 摘要 |
<p>PURPOSE:To improve isolation at transmission and reception by distributing, into two, reception signals with the first 90 deg. hybrid, for demodulation by two double equilibrium modulators, and then performing electric-power synthesizing with the second hybrid. CONSTITUTION:Reception signal 11 is distributed in two signals, phase difference being 90 deg., at the first 90 deg. hybrid 1, and then inputted in the first double equilibrium modulator 2 and the second double equilibrium modulator 3, respectively. The first switch 7 does switching operation with range gate signal 13, so, the modulator 3 is supplied with demodulation code 12 as it is. The phase of the output signal of the demodulator 2 advances by 90 deg. relative to that of the demodulator 3 in terms of reception timing, but lags by 90 deg. in terms of other timings. The second 90 deg. hybrid 4, after making the phase of the output signal of the demodulator 2 lag behind by 90 deg. electric-power-synthesizes the two input signals, and in order to supply a switch 8 with the signal, the two signals, inputted at other than reception timing, is offset each other.</p> |
