Phase mode analysis of directional elements in a circular array
A technique for analyzing the directional elements of a circular array is presented. The technique is based on phase mode decomposition of measured element patterns. It can be used to calibrate the array and may help identify sources of measurement errors. It is illustrated with patterns from a 108-element circular array.
Pattern Synthesis of Circular Antenna Array with Directional Element Employing Deterministic Space Tapering Technique
This paper proposes the concept of sparse appended with the space tapering technique for the synthesis of an antenna radiation pattern. The procedure experiments on a Circular Antenna Array (CAA) configuration comprising of directional element (1 + cos(φ)). The sparse initiates the minimum number of active elements in the CAA, while the space tapering technique gives the complex excitations that yield a beam pattern with constraints such as Side Lobe Level (SLL) and Beam Width (BW) in relation to Dolph-Chebyshev radiation pattern. The phase mode analysis, which is an built-in procedure in the proposed technique explores the circular antenna array configuration characteristics. The simulation results justify the effectiveness of the proposed technique for obtaining the desired radiation pattern synthesis.
Use of directional elements in the null synthesis for arc arrays
A synthesis problem for arc arrays of radiating elements is considered, which consists in determining the array pattern that approximates a desired radiation pattern while vanishing at prescribed directions in the plane of the array. At first, the unconstrained optimal array pattern is determined minimizing the mean-square distance from the desired pattern. Subsequently, the unconstrained pattern is modified to form the nulls.