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Frequency-invariant (FI) beamforming for wideband antenna arrays inevitably involves array aperture loss at the higher-end frequencies of the bandwidth. In order to minimize aperture loss and to fully utilize the array aperture at different operation frequencies, an optimal wideband beamformer for uniform linear array (ULA) is designed based on Dolph-Chebyshev's theory of beamforming. Different from...
A wideband mutual coupling compensation method is introduced in this paper. Using the method of system identification in the frequency domain, a multi-input and multi-output (MIMO) compensation network is identified to equalize the frequency-dependent characteristics of array mutual coupling effect. The receiving mutual impedances calculated at discrete sampling frequencies over a wide bandwidth are...
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