A new pattern-reconfigurable antenna with the function of 360° wide-beam scanning and main beam direction finely-adjustable

2018 ◽  
Vol 60 (8) ◽  
pp. 2076-2081
Author(s):  
Kun Xue ◽  
Huiqing Zhai ◽  
Dong Yang ◽  
Zichun Wei
Keyword(s):  
Main Beam ◽  
Reconfigurable Antenna ◽  
Beam Direction ◽  
Beam Scanning ◽  
Wide Beam

scholarly journals Bioinspired DNA Origami Quasi-Yagi Helical Antenna with Beam Direction and Beamwidth Switching Capability

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Syed Imran Hussain Shah ◽  
Sungjoon Lim
Keyword(s):  
Dna Origami ◽  
Main Beam ◽  
Helical Chain ◽  
Beam Direction ◽  
Fixed Frequency ◽  
Helical Antenna ◽  
Dna Structures ◽  
Antenna Beam ◽  
Dna Molecule ◽  
Direction Switching

Abstract We propose a bioinspired origami quasi-Yagi helical antenna with beam direction and beamwidth switching capability based on transformable DNA origami structure. Each DNA molecule consists of a double helical chain, and its length can be transformed by folding and unfolding. When three transformable origami DNA structures are applied to the quasi-Yagi helical antenna, beam direction and beamwidth can be controlled by folding and unfolding the origami DNA. The transformable DNA structures act as driven, director and reflector elements. The proposed DNA origami antenna provides four beam direction switching states (three states with narrow beamwidth and one state with wide beamwidth) at fixed frequency of 1.9 GHz. For example, the main beam direction of the proposed antenna can be steered to −30°, 0°, +30° and −40° for states 1, 2, 3 and 4, respectively. State 4 provides a 3-dB wider beamwidth of 104°, whereas the beamwidth of other states is narrower than 64°. The proposed concept is numerically and experimentally demonstrated.

scholarly journals A Low-Profile High-Gain and Wideband Log-Periodic Meandered Dipole Array Antenna with a Cascaded Multi-Section Artificial Magnetic Conductor Structure

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4404 ◽  
Author(s):  
Son Trinh-Van ◽  
Oh Heon Kwon ◽  
Euntae Jung ◽  
Jinwoo Park ◽  
Byunggil Yu ◽  
...  
Keyword(s):  
High Gain ◽  
Operating Frequency ◽  
Main Beam ◽  
Impedance Bandwidth ◽  
Beam Direction ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Operating Bandwidth ◽  
Meander Line

This paper presents a low-profile log-periodic meandered dipole array (LPMDA) antenna with wideband and high gain characteristics. The antenna consists of 14 dipole elements. For compactness, a meander line structure is applied to each dipole element to reduce its physical length. As a result, a compact and wideband LPMDA antenna is realized, exhibiting a wide impedance bandwidth of 1.04–5.22 GHz (ratio bandwidth of 5.02:1) for | S 11| < −10 dB. To enhance the antenna gain performance while maintaining the wideband behavior, the LPMDA antenna is integrated with a new design of an artificial magnetic conductor (AMC) structure. The designed AMC is realized by combining three AMC structures of different sizes to form a cascaded multi-section AMC structure, of which its overall operating bandwidth can continuously cover the entire impedance bandwidth of the LPMDA antenna. The proposed AMC-backed LPMDA antenna is experimentally verified and its measured −10 dB reflection bandwidth is found to be in the range of 0.84–5.15 GHz (6.13:1). At the main beam direction within the operating frequency bandwidth, the gain of the proposed AMC-backed LPMDA antenna ranges from 7.15–11.43 dBi, which is approximately 4 dBi higher than that of an LPMDA antenna without an AMC. Moreover, the proposed antenna has a low profile of only 0.138 λ L. ( λ L is the free-space wavelength at the lowest operating frequency).

scholarly journals Dual-Beam and Tri-Band SIW Leaky-Wave Antenna With Wide Beam Scanning Range Including Broadside Direction

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 176361-176368 ◽  
Author(s):  
Yunjie Geng ◽  
Junhong Wang ◽  
Zheng Li ◽  
Yujian Li ◽  
Meie Chen ◽  
...  
Keyword(s):  
Leaky Wave ◽  
Beam Scanning ◽  
Wide Beam ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Dual Beam ◽  
Scanning Range

scholarly journals Principle for the Realization of Dual-Orthogonal Linearly Polarized Antennas for UWB Technique

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Grzegorz Adamiuk ◽  
Mario Pauli ◽  
Thomas Zwick
Keyword(s):  
Substrate Surface ◽  
Single Point ◽  
Broad Band ◽  
Main Beam ◽  
Cross Polarization ◽  
Frequency Range ◽  
Beam Direction ◽  
Array Configuration ◽  
Uwb Radar ◽  
Linearly Polarized

A concept of an array configuration for an ultrawideband suppression of the cross-polarization is presented. The method is explained in detail, and a mathematical description of the principle is given. It is shown that the presented configuration is convenient for the development of very broad band, dual-orthogonal, linearly polarized antennas with high polarization purity. The investigated configuration shows a high decoupling of the orthogonal ports and is capable for antennas with a main beam direction perpendicular to the substrate surface, that is, for a planar design. The phase center of the antenna configuration remains fixed at one single point over the complete desired frequency range, allowing a minimum dispersion of the radiated signal. The influence of nonidealities in the feeding network on the polarization purity is investigated. The presented method introduces a superior possibility of an extension of typical UWB technique to fully polarized systems, which improves significantly performance in, for example, UWB-MIMO or UWB-Radar.

Compact Circular Reconfigurable Antenna for High Directivity and 360° Beam Scanning

2018 ◽  
Vol 17 (8) ◽  
pp. 1492-1496 ◽  
Author(s):  
Md Shahidul Alam ◽  
Yifan Wang ◽  
Nghia Nguyen-Trong ◽  
Amin Abbosh
Keyword(s):  
Reconfigurable Antenna ◽  
Beam Scanning

scholarly journals A Compact, Low-Profile Log-Periodic Meandered Dipole Array Antenna with an Artificial Magnetic Conductor

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Oh Heon Kwon ◽  
Sungwoo Lee ◽  
Jong Min Lee ◽  
Keum Cheol Hwang
Keyword(s):  
Ground Plane ◽  
Array Antenna ◽  
Main Beam ◽  
Beam Direction ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Line Configuration ◽  
Low Profile ◽  
Unit Cells ◽  
Meander Line

A compact and low-profile log-periodic meandered dipole array (LPMDA) antenna with an artificial magnetic conductor (AMC) is proposed. For compactness, a meander line configuration is implemented with dipole elements and optimized using a genetic algorithm (GA) to realize the LPMDA antenna. As a result, a size reduction of approximately 30% is achieved as compared to a conventional log-periodic dipole array antenna. To enhance the gain characteristics, the AMC ground plane configuration is realized with 9 × 9 unit cells for the LPMDA antenna. Two prototypes of the proposed LPMDA antennas with and without an AMC are fabricated and measured to verify its performance. The measured −10 dB reflection ratio bandwidths are 2.56 : 1 (0.85–2.18 GHz) and 2.34 : 1 (0.92–2.16 GHz) for the proposed LPMDA antennas with and without the AMC, respectively. The gain at the main beam direction within the operating frequency bandwidth is significantly improved from 3.94–7.17 dBi to 7.86–10.01 dBi by applying the AMC.

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