Improved mutual coupling compensation in compact antenna arrays

Mutual coupling analysis of Adcock Watson Watt direction finding system based on the receiving mutual impedance

“…To calculate how mutual coupling affects the performance of AWWDFs, each terminal voltage of array element would be re-calculated in the presence of mutual coupling based on receiving mutual impedance concept and marked as V. According to [5]- [7], the signals received by the NS pair elements are given by (11) where Z L is the terminal load which is uniform in each element of Adcock antenna. Z t k,i is the so-called receiving mutual impedance between antenna element k and i.…”

“…Z t k,i is the so-called receiving mutual impedance between antenna element k and i. Because of the Adcock antenna's symmetry, we could easily get (10), (11) and (12), we can induce the following relations:…”

“…Each dipole antenna is terminated with a matched load impedance of Z L =50 . We first verify the symmetric properties of the receiving mutual impedances, i.e., formula in (12) by the method in [11]. All the terminal voltages and currents of this array are obtained through numerical simulation using a commercial MoM solver-FEKO.…”

Coupling compensation for unmatched circular arrays in high-frequency applications

“…This method is efficient only under the condition that the antenna array is in transmitting mode and the distance between antenna elements is not less than l/3, where l is the wavelength of the operating frequency [4]. For alleviating these restricting conditions Hui [4,5] presents a new definition of mutual coupling, named receivingmutual -impedance -method (RMIM). Computer simulations [5] and experimental results [6] have shown that RMIM method produces more accurate DOA estimation in uniform linear array (ULA) structures.…”

“…For alleviating these restricting conditions Hui [4,5] presents a new definition of mutual coupling, named receivingmutual -impedance -method (RMIM). Computer simulations [5] and experimental results [6] have shown that RMIM method produces more accurate DOA estimation in uniform linear array (ULA) structures. However, removal of antenna elements in this method is not practical and sometimes impossible in the field situation, especially at low frequencies, where the dimensions of the array elements are large.…”