| The mutual coupling in antenna arrays is studied with emphasis on the arrays composed of dipoles and rectangular microstrip patches respectively.The mutual coupling between elements is expressed in terms of the normalized impedance matrix of the uniform linear array, the concise expressions for the optimized weight of the LMS algorithm and the signal-to-interference-plus-noise ratio are given. The effect of mutual coupling on the performance of the SINR is illustrated with two examples, a method for compensating the mutual coupling is present, the compensation effect of this method is verified by example. Analyze the linear dipole array with uniform element spacing using the method of moments (MoM), derive the analytical expression for the recovered signal with the Direct Data Domain method, demonstrate the effect of the mutual coupling on the performance of the antenna array by examples, the degradation of the system caused by the mutual coupling is simulated and analyzed in two different electromagnetic environments such as the weak and strong interference. According to the effect mechanism of mutual coupling on the system, a method of mutual coupling compensation in antenna arrays is proposed, A comparison of compensation results between the proposed method and the conventional method is made.Analyze the rectangular microstrip patch array using Green functions method, resolve the integral equation by the method of moment, propose a method for resolving the MoM impedance matrix, which is a combine of analytical method and numerical method. Analyze the conventional method for resolving the coupling matrix and give out an improved method at the same time, the improved method is just relative to the physics characteristics and not change with the scan angle. Propose a method for mutual coupling compensation which is not limit to microstrip arrays and can be used in any small antenna arrays of arbitrary type and arrange. |
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