paper 150127142531

Phased-Multiple-Input Multiple-Output (phased-MIMO) radar has been thoroughly investigated in the literature. This approach divides the transmit antenna array into multiple subarrays that are allowed to overlap. Each subarray coherently transmits a distinct waveform, which is orthogonal to the waveforms transmitted by other subarrays. While phased array radar enjoys the advantage of high coherence gain with no diversity gain, MIMO radar enjoys high diversity gain — whether waveform or spatial diversity gain — with no coherence gain. Phased- MIMO radar enjoys both advantages of coherence gain and diversity gain which enhance the main-to-side lobe levels but unfortunately decrease the antenna directivity. Frequency diversity can improve antenna directivity by applying a small frequency increment between two successive elements but consequently increases average side lobes level. In this paper, we propose a new Phased-MIMO radar with frequency diversity which offers a tradeoff between main-to-side lobe levels and antenna directivity. This technique can exploit frequency diversity which is applied between subarray adjacent elements and between adjacent subarrays. The total beam pattern is an optimum case of the lowest side lobes level as phased-MIMO radar but with higher directivity.

Citation

Alaa El-Din Sayed Hafez, Ahmed Hamed, Nour El-Din Ismail, and Sherif Hanafy Mahmoud, "Design and Analysis of a Phased-MIMIO Array Antenna with Frequency Diversity," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1745-1750

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