Design of a Miniature, Circularly Polarized Antenna Operating in Three Frequency Bands Using a Polarized Ferrite Material

2020 ◽  
pp. 1-1
Author(s):  
S. Jemmeli ◽  
T. Monediere ◽  
E. Arnaud ◽  
L. Huitema
Keyword(s):  
Circularly Polarized ◽  
Frequency Bands ◽  
Ferrite Material

scholarly journals Design of Circularly Polarized Triple-Band Wearable Textile Antenna with Safe Low SAR for Human Health

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1366 ◽  
Author(s):  
Ashok Yadav ◽  
Vinod Kumar Singh ◽  
Pranay Yadav ◽  
Amit Kumar Beliya ◽  
Akash Kumar Bhoi ◽  
...  
Keyword(s):  
Microstrip Line ◽  
Radiation Effect ◽  
Axial Ratio ◽  
Antenna Design ◽  
Circularly Polarized ◽  
Frequency Bands ◽  
Textile Antenna ◽  
Peak Gain ◽  
Triple Band ◽  
Ku Band

In this manuscript, an antenna on textile (jeans) substrate is presented for the WLAN, C band and X/Ku band. This is a wearable textile antenna, which was formed on jeans fabric substrate to reduce surface-wave losses. The proposed antenna design consists of a patch and a defected ground. To energize the wearable textile antenna, a microstrip line feed technique is used in the design. The impedance band width of 23.37% (3.4–4.3 GHz), 56.48% (4.7–8.4 GHz) and 31.14% (10.3–14.1 GHz) frequency bands are observed, respectively. The axial ratio bandwidth (ARBW) of 10.10% (4.7–5.2 GHz), 4.95% (5.9–6.2 GHz) and 10.44% (11.8–13.1 GHz) frequency bands are observed, respectively. A peak gain of 4.85 dBi is analyzed at 4.1-GHz frequency during the measurement. The SAR value was calculated to observe the radiation effect and it was found that its utmost SAR value is 1.8418 W/kg and 1.919 W/kg at 5.2/5.5-GHz frequencies, which is less than 2 W/kg of 10 gm tissue. The parametric study is performed for the validation of the proper functioning of the antenna.

Circularly polarized ferrite patch antenna for LEO satellite applications

2019 ◽  
Vol 12 (4) ◽  
pp. 332-338
Author(s):  
E. Arnaud ◽  
L. Huitema ◽  
R. Chantalat ◽  
A. Bellion ◽  
T. Monediere
Keyword(s):  
Patch Antenna ◽  
Axial Ratio ◽  
Azimuth Angle ◽  
Antenna Design ◽  
Circularly Polarized ◽  
Small Satellites ◽  
Ferrite Material ◽  
Satellite Applications ◽  
Leo Satellite ◽  
Isotropic Radiation

AbstractThis paper presents the capacity of an S band circularly polarized patch antenna using a ferrite material for low-earth orbiting satellites (2025–2100 MHz for TeleCommand) to obtain a semi-isotropic radiation pattern. Indeed, circularly polarized antennas are generally large and bulky which is often incompatible for spatial applications especially for small satellites. A new antenna design is proposed with the following maximum dimensions: a diameter of 80 mm and a height of 12 mm. The structure presents an axial ratio lower than 6 dB (according to requirements) and a realized gain higher than −6 dB over a 4% bandwidth at the limit of coverage i.e. 90° irrespective of the azimuth angle (φ).

scholarly journals A Dual-Band Circularly Polarized Patch Array Antenna for Phase-Only Beam Shaping with Element Rotation

Electronics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 643
Author(s):  
Edoardo Pelliccia ◽  
Roberto Vincenti Gatti ◽  
Piero Angeletti ◽  
Giovanni Toso
Keyword(s):  
Phase Distribution ◽  
Synthesis Method ◽  
Satellite System ◽  
Beam Shaping ◽  
Dual Band ◽  
Circularly Polarized ◽  
Frequency Bands ◽  
Radiating Element ◽  
Effective Phase ◽  
Global Navigation Satellite

In this paper, an innovative patch antenna optimally designed for phase-only beam shaping is presented. The radiating element generates a circularly polarized field and exhibits two separate operative frequency bands. The element is center-fed by a pin connected to the beam forming network (BFN) layer. This unique feature allows us to generate any given phase distribution by simply proportionally rotating the radiating elements with respect to their feeding points. An effective phase-only synthesis method is also illustrated, which takes into account the radiating element rotations. To demonstrate the effectiveness of the proposed solution, two linear arrays for global coverage have been designed, specifically operating in the E1 and E6 frequency bands of the European Global Navigation Satellite System (GNSS) Galileo. The two presented antennas performance have been verified with full-wave simulations, showing excellent agreement with theoretical results and, therefore, confirming the effectiveness of the presented design approach.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Decomposition of Fluctuating Photovoltaic Generation Power in Frequency Bands and Analysis of Chaotic Properties

2016 ◽  
Vol 136 (7) ◽  
pp. 621-627
Author(s):  
Akiko Takahashi ◽  
Akihiro Yamagata ◽  
Jun Imai ◽  
Shigeyuki Funabiki
Keyword(s):  
Photovoltaic Generation ◽  
Frequency Bands ◽  
Generation Power
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