Abstract
A digital-analog hybrid antenna array is proposed and verified with 2-bit time-modulators. Under different configurations, the antenna array can be set as phased array for transmitting and digital array for receiving. Its principle is as follows. For the transmitting, the 2-bit time-modulators concentrate most power to the first harmonic with equivalent single sideband (SSB) modulation. The phase differences among all the elements are controlled by added modulation sequences. For the receiving, the power of received signal is distributed to harmonics under periodic phase modulation. Then the array manifold is estimated from generated harmonics, and the direction of arrival (DOA) can be acquired by spatial spectrum estimation. The proposed structure breaks down the boundary between the analog array and digital array. Numeric simulations and experiments are provided to verify its effectiveness.
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