Mutual coupling compensation for a practical VHF/UHF Yagi‐Uda antenna array

Abstract

The performance of an antenna array is considerably affected by mutual coupling effects between antenna elements. When a large number of antenna elements are located close to each other, mutual coupling becomes more significant. In this study, by using a new mutual impedance matrix, a decoupling methodology for compensating mutual coupling effects in a practical very high frequency (VHF)/ultra high frequency (UHF) Yagi-Uda antenna array is introduced. No previous publications have studied VHF/UHF Yagi-Uda antenna arrays in this context. In the proposed scheme, extreme care has been taken to account for both self-and mutual impedance related to mutual coupling effects. Experimental and simulation results show that using the proposed method, a perfect decoupling is achieved. The application of high-resolution direction of arrival (DOA) estimation algorithms in decoupled experimental data leads to excellent performance of DOA estimation, in terms of accuracy and resolution. In addition, it is concluded (from experimental and simulation results) that mutual coupling effects between array elements as well as the root-mean-square error of estimated parameters depend on the direction of arrival. It is also deduced that in the presence of mutual coupling, estimation of signal parameter via rotation invariance techniques algorithm performs better than other subspace-based algorithms.

Compensation method for distorted planar array antennas based on structural–electromagnetic coupling and fast Fourier transform

“…Two-dimensional fast Fourier inversion transform is then performed on the element excitation current in (5), that is…”

“…With rapid development of military technology, radars are required for better target identification, stronger antijamming ability, and more reliable stability, which lead to high demand for the performance of antenna. However, complex operating environment causes structural deformation and introduces serious degradation to the property of antennas [4][5][6]. For example, the space-based array antennas are subjected to long term of sunshine and low-temperature heat sink in space when working at near earth orbit.…”

Miniaturization of Quasi-Yagi Antenna Array with High Gain Using Split-Ring Resonators

“…e large reflection of the radiation port could cause the pattern distortion and gain reduction [11]. erefore, the research on decoupling of the quasi-Yagi antenna array has practical application significance.…”

Generalisation of genetic algorithm and fast Fourier transform for synthesising unequally spaced linear array shaped pattern including coupling effects

“…There are plenty of papers talking about mutual coupling effects from different points of view [17]. For example, many mutual coupling correction techniques have been presented in different applications such as direction-of-arrival (DOA) estimation [18][19][20][21][22], adaptive beamforming [23][24][25], antenna array manifold repairment [21,22,26] and static array pattern synthesis [7,12,[27][28][29][30][31]. Due to the significance of the mutual coupling, incorporating the mutual coupling into the pattern synthesis should be very useful.…”