An improved thinning method for density tapering of planar array antennas

Numazaki, T.; Mano, Seiji; Katagi, Takashi; Mizusawa, M.

doi:10.1109/tap.1987.1144224

Cited by 22 publications

(8 citation statements)

References 3 publications

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“…Consider a phased array in which an amplitude distribution is produced on the antenna aperture by the use of multiple excitation amplitude ratios or of a variable density arrangement of the elements such as a thinned array [8]. Figure 4 shows the amplitude of each element antenna at coordinate x m as well as the total amplitude on the right half of the phased array.…”

Section: Array With Amplitude Distributionmentioning

confidence: 99%

Beam direction of the difference pattern in a monopulse phased array antenna

Ohtsuka

Chiba

Katagi

et al. 2000

Electron. Comm. Jpn. Pt. I

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The beam direction of a monopulse phased array antenna can be changed rapidly by controlling the phase shifters, which is useful in detecting the direction of arrival of radio waves. In monopulse tracking, the null point of the difference pattern is used as the reference for direction determination. However, errors of phase setting, including the quantization error of the phase shifters, give rise to the problem of null shift, that is, the null point shifts from the set direction. This study examines the relation between the phase setting error and the null shift from the statistical point of view and expresses the relation between the two in a simple formula. In the general evaluation function, the position of the element antenna and the excitation amplitude are used as the parameters. Then, an expression is derived by approximating the amplitude distribution over the antenna aperture as a quadratic function, with the result that the evaluation function can be derived without defining the element position. The effectiveness of these expressions is verified by numerical calculation examples. In addition, the minimum change of the beam direction, which determines the angular measurement accuracy of the monopulse phased array antenna, depends on the phase setting accuracy of the digital phase shifters and on the accuracy of the operation unit that calculates the phase to be set in the phase shifters. The accuracies (expressed as numbers of bits) required by the phase shifters and the operation unit so that they can produce the minimum change of the beam direction are investigated, and a simple formula is obtained. In order to verify the results of these investigations, experimental results and numerical calculations are presented. © 2000 Scripta Technica, Electron Comm Jpn Pt 1, 84(1): 68–76, 2001

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Section: Array With Amplitude Distributionmentioning

confidence: 99%

Beam direction of the difference pattern in a monopulse phased array antenna

Ohtsuka

Chiba

Katagi

et al. 2000

Electron. Comm. Jpn. Pt. I

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“…Till now, only a few studies have addressed this topic [ 17 , 19 , 20 , 21 , 22 , 23 ]. Even so, they are all implemented in a very similar statistical way.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Planar Circular Arrays with Quantized Amplitude Weights

Chen

2021

Sensors

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A new stepwise and radially processed method for synthesizing uniformly distributed circular planar arrays with quantized weights is proposed in this paper. This method is based on a generalized analytical equation describing that for high directivity focusing arrays, minimizing the weighted mean square error between the reference pattern and the synthesized pattern is equivalent to minimizing the mean square error between the radial cumulative distributions of the reference distribution and the synthesized distribution. This principle has been successfully performed for designing large concentric ring arrays, and in this paper, we extend its use for synthesizing uniformly distributed planar circular arrays with quantized weights. Various numerical examples and comparisons with several reported statistical methods in terms of the lowest Maximum SideLobe Level (MSLL) demonstrate the effectiveness of the proposed method.

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“…However it is not optimum and in that it does not ensure that peak side lobes are maintained bellow a given level. In [9] a thinning method is presented to realize the desired aperture distribution in a planar array antenna with elements fixed on an array lattice. In this method elements to be excited are determined by quantizing cumulative weights which are calculated from the desired aperture distribution.…”

Section: Introductionmentioning

confidence: 99%

“…{x n det = ((−N/2) : 1 : (N/2))/N} (8) {x n rand = rn = −1/2 + rand(1, N)}(9) and each of the two workspaces operates over the interval[−1/2, 1/2]. Equation (8) means a uniform spacing with N elements in [−1/2, 1/2].…”

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confidence: 99%

New Stochastic Algorithm for Optimization of Both Side Lobes and Grating Lobes in Large Antenna Arrays for MPT

Shinohara

Shishkov

Matsumoto

et al. 2008

IEICE Transactions on Communications

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The concept of placing enormous Solar Power Satellite (SPS) systems in space represents one of a handful of new technological options that might provide large scale, environmentally clean base load power to terrestrial markets. Recent advances in space exploration have shown a great need for antennas with high resolution, high gain and low side lobe level (SLL). The last characteristic is of paramount importance especially for the Microwave Power Transmission (MPT) in order to achieve higher transmitting efficiency (TE) and higher beam collection efficiency (BCE). In order to achieve low side lobe levels, statistical methods play an important role. Various interesting properties of a large antenna arrays with randomly, uniformly and combined spacing of elements have been studied, especially the relationship between the required number of elements and their appropriate spacing from one viewpoint and the desired SLL, the aperture dimension, the beamwidth and TE from the other. We propose a new unified approach in searching for reducing SLL by exploiting the interaction of deterministic and stochastic workspaces of proposed algorithms. Our models indicate the side lobe levels in a large area around the main beam and strongly reduce SLL in the entire visible range. A new concept of designing a large antenna array system is proposed. Our theoretic study and simulation results clarify how to deal with the problems of side lobes in designing a large antenna array, which seems to be an important step toward the realization of future SPS/MPT systems.

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An improved thinning method for density tapering of planar array antennas

Cited by 22 publications

References 3 publications

Beam direction of the difference pattern in a monopulse phased array antenna

Beam direction of the difference pattern in a monopulse phased array antenna

Synthesis of Planar Circular Arrays with Quantized Amplitude Weights

New Stochastic Algorithm for Optimization of Both Side Lobes and Grating Lobes in Large Antenna Arrays for MPT

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