scholarly journals Initial designing a dual-band antenna baced on end-fed dipole-like radiators for digital antenna arrays

2021 ◽  
pp. 44-50
Author(s):  
S. A. Alekseytsev
Keyword(s):  
Antenna Arrays ◽  
Dual Band ◽  
Far Field ◽  
Emf Method ◽  
Field Zone ◽  
Dual Band Antenna ◽  
Accurate Design ◽  
Dual Band Antennas ◽  
Parasitic Currents ◽  
Initial Arrangement

The paper deals with the designing of the initial arrangement for dual-band antennas comprising two parallel dipole-like radiators as the drivers for the mentioned antenna. The excitation of the drivers is provided by the source of the induced electromotive forces (EMF), whose outputs are attached to the remote terminals of the radiators. The paper also provides the key electrodynamic characteristics of the structure under research for the following procedure of multi-parametric nonlinear optimization. In addition, on the basis of the induced EMF method, has been obtained the expressions for the far-field zone (Fraunhofer zone) characteristics with taking into account the parasitic currents on the radiating bodies of the dipole, which allows more accurate design of the initial topology of the antenna.

scholarly journals Design of Dual Band Microstrip Antenna at L-Band and S-Band Frequencies for Synthetic Aperture Radar (SAR) Sensors

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Binarti Fauziah Fitriani ◽  
Heroe Wijanto ◽  
Agus Dwi Prasetyo
Keyword(s):  
Synthetic Aperture Radar ◽  
Return Loss ◽  
Synthetic Aperture ◽  
Dual Band ◽  
Dual Band Antenna ◽  
Penetration Ability ◽  
L Band ◽  
Dual Band Antennas ◽  
Patch Technique ◽  
Aperture Radar

SAR (Synthetic Aperture Radar) is a remote sensing system using radar for high resolution image capture. The use of different frequency bands on SAR, will result different effect of image. The higher frequency used, the higher resolution of resulting image. The lower frequency used, the higher penetration ability. Therefore, using dual band antenna on the SAR system can improve the data collection and information of the target, also reduce its size. This study designs dual band antennas at 1.27 GHz (L-Band) and 3 GHz (S-Band) frequencies. To obtain the characteristics, the antenna is designed by slotted patch technique and using proximity coupled feeding. As a result, by using dielectric FR4 Epoxy with relative permittivity 4,6, the antenna working at frequency 1.27 GHz with return loss -25.131 dB, VSWR 1.1201, and bandwidth (return loss ? -10 dB) 19.9 MHz. While at 3 GHz work frequency return ross is -16.802 dB, VSWR 1.3381, and bandwidth (return loss ? -10 dB) 125.3 MHz.

Inductive power transfer and FAR-field radiation with small dual-band antennas

2015 ◽  
Vol 57 (5) ◽  
pp. 1053-1056 ◽  
Author(s):  
Tammy Chang ◽  
Yuji Tanabe ◽  
Bryant Tan ◽  
Ada Poon
Keyword(s):  
Dual Band ◽  
Far Field ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Field Radiation ◽  
Dual Band Antennas ◽  
Inductive Power

Compact dual-band antennas with large frequency ratio and bandwidth enhancement for wireless applications

2016 ◽  
Vol 9 (5) ◽  
pp. 1131-1138
Author(s):  
Abdelheq Boukarkar ◽  
Xian Qi Lin ◽  
Yuan Jiang
Keyword(s):  
Frequency Ratio ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Bandwidth Enhancement ◽  
Wireless Applications ◽  
Dual Band Antenna ◽  
Low Profile ◽  
Dual Band Antennas ◽  
Frequency Ratios ◽  
Large Frequency

In this paper, compact single-feed dual-band antennas for different wireless applications are proposed. First, a dual-band antenna with a comparatively large frequency ratio of 2.58 is designed. Then, a novel dual-band antenna is introduced in order to enhance the upper frequency band. The technique consists of modifying the feed line structure, which leads to a 9.23% of impedance bandwidth at the central frequency of 6.5 GHz instead of 2.06%. The designed antennas are fabricated and tested in the laboratory and in a small anechoic chamber in order to measure their reflection coefficient, gains, and efficiencies. Good agreement between simulated and measured results is obtained. The designed antennas are particular because they have low profile, very simple single-feed technique, can be designed for large frequency ratios, and also the bandwidth can be clearly enhanced. Therefore, they can be used for different wireless applications.

Calculation of the Side and Back Far-Field Zone Radiation for Reflector Antennas with Radio Absorbing Coating on Edges

2004 ◽  
Vol 61 (1) ◽  
pp. 67-74
Author(s):  
O. I. Sukharevsky ◽  
V. A. Vasilets ◽  
S. V. Nechitaylo ◽  
S. V. Orekhov
Keyword(s):  
Far Field ◽  
Field Zone ◽  
Reflector Antennas

scholarly journals High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3184
Author(s):  
Jing Li ◽  
Yonggang He ◽  
Han Ye ◽  
Tiesheng Wu ◽  
Yumin Liu ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Conversion Efficiency ◽  
Antenna Arrays ◽  
Beam Splitter ◽  
High Efficiency ◽  
Visible Region ◽  
Polarized Light ◽  
Dual Band ◽  
Phase Gradient ◽  
Total Transmission

Metasurface-based beam splitters attracted huge interest for their superior properties compared with conventional ones made of bulk materials. The previously reported designs adopted discrete metasurfaces with the limitation of a discontinuous phase profile. In this paper, we propose a dual-band beam splitter, based on an anisotropic quasi-continuous metasurface, by exploring the optical responses under x-polarized (with an electric field parallel to the direction of the phase gradient) and y-polarized incidences. The adopted metasurface consists of two identical trapezoidal silicon antenna arrays with opposite spatial variations that lead to opposite phase gradients. The operational window of the proposed beam splitter falls in the infrared and visible region, respectively, for x- and y-polarized light, resulting from the different mechanisms. When x-polarized light is incident, the conversion efficiency and total transmission of the beam splitter remains higher than 90% and 0.74 within the wavelength range from 969 nm to 1054 nm, respectively. In this condition, each array can act as a beam splitter of unequal power. For y-polarized incidence, the maximum conversion efficiency and transmission reach approximately 100% and 0.85, while the values remain higher than 90% and 0.65 in the wavelength range from 687 nm to 710 nm, respectively. In this case, each array can be viewed as an effective beam deflector. We anticipate that it can play a key role in future integrated optical devices.

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