Broadband Beam Forming for Circular Sensor Array via Modal Decomposition

A new method of broadband constant beamwidth beam-forming for circular arrays is proposed in this paper. The design requirements of this method were specified by the weights which formed the low-side-lobe beams of each sub-band over the broad frequency band. The low-side-lobe beams of each sub-band which expands the expected beam using orthogonal series, obtains the orthogonal series coefficients by optimization method, gets array element weights according to the physical mechanism, and then composes its direction. The beam forming on the circular sensor array is optimized on the computer. The side-lobe is lowed with the appropriate main lobe using the proposed method. The method can be used in multifold application occasions on the beam forming design and optimization effectively.