A fast full-wave simulation technique is presented for the analysis of large irregular planar arrays identical 3-D metallic antennas. The solution method relies on Macro Basis Functions (MBF) approach and an interpolatory to compute interactions between MBFs. Harmonic-polynomial (HARP) model established near-field in a modified system coordinates. For extremely made complex antennas, two approaches assuming limited radius influence mutual coupling are considered: one based sparse-matrix LU...

An approach based on the method of moments and using a set stretched Fourier-Bessel basis functions (FBBFs) is presented for analysis elliptical domain metasurfaces (MTSs). This shape preferred to traditional circular domain, when better control aperture efficiency required. The proposed formulation makes use harmonic decomposition substrate dyadic Green's function efficiently compute reaction integrals. It shown that computation time associated with sheet impedance matrix calculation almost...

A fast full-wave scheme is presented for the analysis of large printed antenna arrays, making use macrobasis functions (MBFs) technique. The interaction between MBFs computed efficiently through a combination contour-fast Fourier transform (C-FFT) and interpolatory MBF-based techniques, which effectively deal with different parts structure. Substantial improvement introduced to C-FFT by adding up FFT tables before interpolating, dramatically reduces memory required store accelerates...

Effective approaches for interference nulling in large random planar arrays are presented. Starting from the well-known subtraction technique, it is shown that suppression only effective when mutual coupling taken into account. Moreover, practical antennas with significant cross-polarization levels, additional efforts required to null both co- and cross-patterns. Alternative techniques proposed efficiently generate patterns able suppress interferers output of beamformer arrays. In...

Large radio telescopes in the 21st century such as Low-Frequency Array (LOFAR) or Murchison Widefield (MWA) make use of phased aperture arrays antennas to achieve superb survey speeds. The Square Kilometer low frequency instrument (SKA1-LOW) will consist a collection non-regular array systems. prediction main beam these using few coefficients is crucial for calibration telescope. An effective approach model and first sidelobes large presented. exploits Zernike polynomials represent pattern....

This paper present further validations of a Method Moment (MoM) based technique dedicated to fast simulation SKA-low arrays. In particular, the embedded element patterns and array are studied. The obtained using this compared with those commercial software CST. comparison shows importance mutual coupling in modeling these patterns. Further validation is demonstrated by an example nulling presence coupling.

A fast iterative solver is presented to analyze large random arrays made of identical elements. The technique exploits the macro basis functions (MBFs) represent currents on antennas. Furthermore, those MBFs are supposed be same all This feature accelerates exploitation multipoles method in that radiation patterns each element.

Correlation between SKA-LOW stations is studied in this paper. The mutual coupling taken into account via embedded element patterns obtained from the simulation of whole stations. To reduce sidelobes correlated pattern, a rotation implemented. This results smoother behavior sidelobe region. Moreover, spherical-wave expansion exploited to represent station beam which then facilitates correlation

The loading condition to maximize the total received power in arbitrary antenna arrays is presented. It found that loads should equal conjugate of active impedance array transmitting case. A physical insight into solution provided. Numerical validation on a 2-D nonregular

A fast full-wave simulation for the synthesis of printed antenna arrays is presented. The technique relies on a scheme, exploiting Macro Basis Functions (MBF) technique, to quickly analyze arrays. Mutual coupling (MC) taken into account by embedded element patterns in process. hybridized with an iterative convex optimization effectively optimize excitation and locations double-step routine. synthesized will therefore fulfill all requirements. performance method validated bowtie antennas.

An interference cancellation algorithm with main-lobe maintenance is presented under the framework of generalized sidelobe canceller. The preservation pattern mainlobe obtained by subspace. subspace assumed for main beam modified embedded element patterns using fast full wave simulation techniques. Simulation results show effectiveness

A differential equation is established to transform an array with constant average density into prescribed density. It shown that this allows good control over the first few sidelobes. This especially true when combined a limited amplitude weighting compensates for local variations, effect on sensitivity.

Sparse arrays of antennas can sometimes be modeled without accounting for the mutual coupling. In that case, array radiation pattern expressed as product two factors: isolated antenna and factor. Using impedance matrix, this formalism extended to account coupling when is made single-mode antennas. letter, we propose an extension case multimode We show that, contrary matrix element patterns are not sufficient rigorously Building on these concepts, a new quantity, admittance matrix. Combined...