So far, a wideband spatial beamformer has been proposed. This kind of beamformer has a major contribution as its weighting coefficients are real valued in which they can be simply realized by attenuators or amplifiers. However, so far, the range of attenuation or amplification is relatively large which is not practical for hardware realization. Therefore, this paper proposes a concept to reduce the range of weighting coefficients hence, the hardware realization becomes practical. In this paper, a full prototype of wideband spatial beamformer is constructed to reflect the true beamforming performance of the proposed refinement method. Its radiation patterns obtained from simulation and measurement are compared. As a result, we can reduce the attenuation or amplification range while some radiation characteristic is remained.
Recently, an outstanding wideband beamformer utilizing only space domain, not time or frequency domain, has been proposed, so-called wideband spatial beamformer. The advantage of this beamformer is that it requires only attenuators or amplifiers to perform beam formation in wide frequency band as its weighting coefficients become real values. As a result, tapped delay lines, frequency filters, or phase shifters are avoidable. This article presents an extension work for the mentioned wideband spatial beamformer. The beamforming algorithm is modified to produce multibeam patterns with one set of real-valued weights for the purpose of energy saving. The proposed concept is tested through simulated and measured results to confirm beamforming capability.
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