• Title, Summary, Keyword: Planar array

Search Result 212, Processing Time 0.047 seconds

Design of an Optimal Planar Array Structure with Uniform Spacing for Side-Lobe Reduction

  • Bae, Ji-Hoon;Seong, Nak-Seon;Pyo, Cheol-Sig;Park, Jae-Ick;Chae, Jong-Suk
    • Journal of electromagnetic engineering and science
    • /
    • v.3 no.1
    • /
    • pp.17-21
    • /
    • 2003
  • In this paper, we design an optimal planar array geometry for maximum side-lobe reduction. The concept of thinned array is applied to obtain an optimal two dimensional(2-D) planar array structure. First, a 2-D rectangular array with uniform spacing is used as an initial planar array structure. Next, we modify the initial planar array geometry with the aid of thinned array theory in order to reduce the maximum side-lobe level. This is implemented by a genetic algorithm under some constraint, minimizing the maximum side-lobe level of the 2-D planar array. It is shown that the optimized planar array structure can achieve low side-lobe level without optimizing the excitations of the array antennas.

Wideband Capon Beamforming for a Planar Phased Radar Array with Antenna Switching

  • Lee, Moon-Sik
    • ETRI Journal
    • /
    • v.31 no.3
    • /
    • pp.321-323
    • /
    • 2009
  • A wideband beamforming algorithm for estimating the azimuth angle, elevation angle, velocity, and range using a planar phased radar array with antenna switching is proposed. It uses the time-variant steering vector model. Simulation results illustrating the performance of the proposed beamformer are presented.

  • PDF

Design of Scannable Non-uniform Planar Array Structure for Maximum Side-Lobe Reduction

  • Bae, Ji-Hoon;Kim, Kyung-Tae;Pyo, Cheol-Sig;Chae, Jong-Suk
    • ETRI Journal
    • /
    • v.26 no.1
    • /
    • pp.53-56
    • /
    • 2004
  • In this letter, we propose a novel design scheme for an optimal non-uniform planar array geometry in view of maximum side-lobe reduction. This is implemented by a thinned array using a genetic algorithm. We show that the proposed method can maintain a low side-lobe level without pattern distortion during beam steering.

  • PDF

A Beam Design Method for Planar Array with Unequal Transducer Sensitivities (불균일 트랜스듀서 감도를 갖는 평면 배열의 빔 설계 기법)

  • 조치영;권오조
    • Journal of KSNVE
    • /
    • v.8 no.4
    • /
    • pp.663-669
    • /
    • 1998
  • In this paper, a beam design method is presented for the planar array with unequal transducer sensitivities. Basically the proposed method consists of two steps. At first, the optimum weightings are designed with the assumption that all array elements have an uniform sensitivity. Next, the compesnated weightings for the unequal transducer sensitivities can reversely be determined from an inverse problem utilizing the design beam pattern evaluated by the predetermined optimal weightings. A numerical example is inculded to illustrate the proposed method.

  • PDF

New Elements Concentrated Planar Fractal Antenna Arrays for Celestial Surveillance and Wireless Communications

  • Jabbar, Ahmed Najah
    • ETRI Journal
    • /
    • v.33 no.6
    • /
    • pp.849-856
    • /
    • 2011
  • This research introduces three new fractal array configurations that have superior performance over the well-known Sierpinski fractal array. These arrays are based on the fractal shapes Dragon, Twig, and a new shape which will be called Flap fractal. Their superiority comes from the low side lobe level and/or the wide angle between the main lobe and the side lobes, which improves the signal-to-intersymbol interference and signal-to-noise ratio. Their performance is compared to the known array configurations: uniform, random, and Sierpinski fractal arrays.

Planar Array of a Probe Excited Circular Ring Radiating Bidirectional Pattern

  • Phongcharoenpanich, Chuwong;Sroysuwan, Thanarart;Wounchoum, Phairote;Kosulvit, Sompol;Krairiksh, Monai
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.719-722
    • /
    • 2002
  • This paper reports the characteristics of a bidirectional antenna by using a planar array of a probe excited circular ring. The element of a bidirectional antenna is first designed to achieve the maximum directivity. The directivity can be further increased by arranging these elements to form the linear array. There are two types of linear array to be investigated i.e., on axis and off axis arrangement. On-axis linear array yields better directivity than off-axis linear array. Therefore, this orientation is further used to form the planar array. The radiation characteristics of this optimum planar array are rigorously reported. The proposed structure is very useful to extend the distance between the base station in PCT system.

  • PDF

A Low-Complexity Planar Antenna Array for Wireless Communication Applications: Robust Source Localization in Impulsive Noise

  • Lee, Moon-Sik
    • ETRI Journal
    • /
    • v.32 no.6
    • /
    • pp.837-842
    • /
    • 2010
  • This paper proposes robust source localization methods for estimating the azimuth angle, elevation angle, velocity, and range using a low-complexity planar antenna array in impulsive non-Gaussian noise environments. The proposed robust source localization methods for wireless communication applications are based on nonlinear M-estimation provided from Huber and Hampel. Simulation results show the robustness performance of the proposed robust methods in impulsive non-Gaussian noise.

A Multibeam Pattern Synthesis of Planar Array Antenna (평면 배열 안테나에 의한 다중 빔 복사 패턴의 합성)

  • Hur, Moon-Man;Lee, In-Jae;Yoon, Hyun-Bo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.17 no.10
    • /
    • pp.1007-1019
    • /
    • 2006
  • In this paper, the synthesis method of multibeam radiation pattern with multi-directional beams and nulls is proposed. Genetic algorithm is applied for the optimization of amplitude and phase of the feeding signal into each element that is structured in planar array of single patch antenna with an arbitrary field distribution. To verify the validity of the proposed method, $2{\times}2$ planar array antenna is used for the measurement and the measured far field radiation pattern is compared with the simulation result. As a result, the synthesis of multibeam radiation pattern is implemented by the optimization of amplitude and phase of the feeding signal into each element of $8{\times}8$ planar array antenna system.

Design of Linear XY Stage using Planar Configuration and Linear Motors with Halbach Magnet Array (평면형 구조와 Halbach 자석배열 선형모터를 이용한 리니어 XY 스테이지의 설계)

  • Kim, Ki-Hyun;Lee, Moon-G.
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.19 no.4
    • /
    • pp.553-561
    • /
    • 2010
  • In flat panel display or semiconductor industries, they install the equipments with fine line width and high throughput for fabrication and inspection. The equipments are required to have the linear stage which can position the work-piece with high speed, fine resolution on wide range of motion. In this paper, a precision planar linear XY stage is proposed. The stage has a symmetric planar window configuration and is guided by air-bearings on granite plate. The symmetric planar window configuration makes the stage has robustness against dynamic and thermal disturbances. The air-bearings let the stage move smooth on straight guide bar and flat granite surface. The stage is actuated by linear motor with Halbach magnet array (HMA). HMA generates more confined magnetic flux than conventional array. The linear motors are optimized by using sequential quadratic programming (SQP) with the several constraints that are thermal dissipation, required power, force ripple and so on. The planar linear XY stage with the symmetric planar configuration and the linear motors is implemented and then the performance such as force ripple, resolution and stroke are evaluated.