• Title/Summary/Keyword: planar array

Search Result 224, Processing Time 0.028 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

A Study on Fault Diagnosis for Planar Active Phased Array Antenna (평면 능동위상배열안테나 결함소자 진단방법에 관한 연구)

  • Jin-Woo Jung;Seung-Ho Kang
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.18 no.1
    • /
    • pp.11-22
    • /
    • 2023
  • A radiating elements fault diagnosis method with simplified radiation pattern measurement procedure was presented for planar active phased array antenna system. For presenting the mentioned method, the technique for linear approximation based on the radiation characteristics of a planar array configuration and a technique for solving a unique solution problem that occur in process of diagnosing a fault in a radiating elements were presented. Based on the presented method and a genetic algorithm, experimental simulations were performed for radiating element defect diagnosis according to various planar active phased array antenna configurations. As a result, it was confirmed that the presented radiating element fault diagnosis method can be smoothly applied to planar active phased antennas having various configurations.

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
    • /
    • 2002.07b
    • /
    • 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

STUDY ON THE OPTIMAL PLANAR ARRAY STRUCTURE WITH TRIANGULAR LATTICE FOR SIDE-LOBE REDUCTION (삼각 격자구조를 갖는 평면배열 안테나의 부엽 레벨 감소를 위한 최적 평면배열 형상에 관한 연구)

  • 배지훈;성낙선;이태윤;김종면;표철식
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • 2002.11a
    • /
    • pp.250-254
    • /
    • 2002
  • In this paper, we design an optimized planar array structure with triangular lattice for side-lobe reduction using a genetic algorithm. A constraint optimization is implemented by optimally removing some outer array elements far from the array center. It is shown that only the proper array shape without optimizing the magnitudes and phases of each array antenna can give low side-lobe level with a slight main beam broadening.

  • PDF

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 s.113
    • /
    • 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.