アダプティブアレイの汎用化の研究

京都大学0048新制・課程博士工学博士甲第3808号工博第976号新制||工||696(附属図書館)UT51-62-M23京都大学大学院工学研究科電気工学第二専攻(主査)教授 木村 磐根, 教授 池上 文夫, 教授 西川 禕一学位規則第5条第1項該当Kyoto UniversityDFA

A Modeling of Slot on the PCB Ground Plane by Using Genetic Algorithm

Abstract Modeling a slot at a ground plane is studied when a signal trace runs over it. Supposing the slot would work as a slot line with some terminal loads, we propose an experimental method to determine the parameters of the slot-line model by using a genetic algorithm (GA). At first, time-domain responses of the transmission line were measured by using a time-domain reflectometer (TDR). Then using GA, we determined a likely equivalent circuit and its parameters so as to agree with the measured and computed responses. As equivalent circuits of radiation impedance, parallel-CR, parallel-LR, series-CR, and series-LR circuits were assumed in advance. And we set possible ranges of their parameters and effective permittivity of the slot line too. Under such condition, GA determined the most likely model and parameters. By using the proposed method, it is expected to estimate a far-field emission pattern and to discover the mechanism of far-field emission and signal integrity. Introduction With the demand of high-density wiring on a printed circuit board (PCB), signal traces crossing slots in a ground plane are found. The slots are formed by a boundary of different voltage power planes. Such configuration models showing the interconnection of PCBs cause serious EMC problems. That is, they worsen a far-field emission and signal integrity. To overcome these problems, it is required to make clear the behavior of the slot on the ground plane. In this paper we consider PCB models shown i

Eigenspace-Based Blind Pattern Optimizations of Steerable Antenna Array for Interference Cancellation

A novel adaptive algorithm for an array using directional elements called a hybrid smart antenna system is proposed. The algorithm controls the element patterns on the basis of an objective function composed of eigenvalues of a covariance matrix. A high and stable array output signal-to-interference-plus-noise ratio (SINR) is achieved by improving both the received powers and the spatial correlation coefficient between incident waves, without prior knowledge such as directions-of-arrival (DOA), channel state information (CSI), or training signals. The characteristics of the proposed algorithm are theoretically and numerically clarified for a simple case involving two incident waves. Convergence with least mean squares (LMS) algorithm is found to be as fast as that with recursive least squares (RLS) algorithm in this system. Also, simulation for statistical performance evaluation is carried out in comparison with a conventional system. Furthermore, a method to implement the proposed eigenspace control algorithm without having to solve the eigenvalue problem is shown

RF Performance of Layer-Structured Broadband Passive Millimeter-Wave Imaging System

Low profile and simple configuration are advantageous for RF module in passive millimeter-wave imaging system. High sensitivity over broad operation bandwidth is also necessary to detect right information from weak signal. We propose a broadband layer-structured module with low profile, simple structure, and ease of manufacture. This module is composed of a lens antenna and a detector module that consists of a detector circuit and a broadband microstrip-to-waveguide transition. The module forms a layer structure as a printed substrate with detector circuit is fixed between two metal plates with horn antennas and back-short waveguides. We developed a broadband passive millimeter-wave imaging module composed of a lens antenna and a detector module in this work. The gain and the antenna efficiency were measured, and the broadband operation was observed for the lens antenna. For the detector module, peak sensitivity was 8100 V/W. Furthermore, the detector module recognized a difference in the absorber’s temperature. The designs of the lens antenna and the detector module are presented and the RF performances of these components are reported. Finally, passive millimeter-wave imaging of a car, a human, and a metal plate in clothes is demonstrated in this paper