Non-uniform Amplitude Transmitarray for Multi-Beam Including Near-Field Focusing

초록

This paper presents a non-uniform amplitude transmitarray for a multi-beam that includes near field focusing, based on a frequency selective surface (FSS). Each cell on the FSS is fed by a slot array and its feeding magnitude is adjusted by the slot position. The phase sets required for near field focusing and far field steering are controlled by the cell size of the FSS located above each slot. To confirm the performances of the antenna, a multi-beam antenna for beam focusing and steering is designed. The required phase and amplitude of each cell are simply calculated and optimized by the principle of superposition. Finally, a 6 by 4 array prototype antenna operating at 5.8 GHz is realized, and its characteristics are measured. The antenna can simultaneously focus on a near field spot and radiate in the desired far field direction. The measured and simulated results are found to be in good agreement. IEEE

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