A linearly polarized rectangular dual-mode horn with a corrugated excitation region

2002 ◽  
Author(s):  
J. Salomonsson ◽  
P.-S. Kildal ◽  
L.G. Andersson
Keyword(s):  
Dual Mode ◽  
Excitation Region ◽  
Linearly Polarized

Soft X-ray photochemistry beamline at SPring-8

1998 ◽  
Vol 5 (3) ◽  
pp. 545-547 ◽  
Author(s):  
I. Koyano ◽  
M. Okuyama ◽  
E. Ishiguro ◽  
A. Hiraya ◽  
H. Ohashi ◽  
...  
Keyword(s):  
High Resolution ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
X Rays ◽  
High Quality ◽  
X Ray ◽  
Excitation Region ◽  
Linearly Polarized ◽  
Grating Monochromator

Design and construction of a soft X-ray beamline at SPring-8 is reported. The beamline utilizes high-quality linearly polarized soft X-rays obtainable from a figure-8 undulator for the study of photophysical and photochemical processes of atoms, molecules and surfaces in the inner-shell excitation region. It consists of two experimental stations, a photochemistry station and a chemical vapour deposition (CVD) station. A high-resolution grating monochromator is installed at the photochemistry station, while the intense undispersed undulator radiation is used at the CVD station. Unique features of the experimental chambers and of the analysis and characterization systems are described along with those of the monochromator.

scholarly journals Ultrathin dual-mode vortex beam generator based on anisotropic coding metasurface

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Proof Of Concept ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves

AbstractIn this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is designed to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

scholarly journals Двухдиапазонная двухмодовая антенна с поляризационно-разнесенным приемом

2021 ◽  
Vol 64 (5) ◽  
pp. 308-324
Author(s):  
Р. Дхара ◽  
Т. Кунду
Keyword(s):  
Circular Polarization ◽  
Dual Band ◽  
Dual Mode ◽  
Linearly Polarized ◽  
Dual Polarized

В статье представлена компактная двухдиапазонная двухмодовая антенна двойной поляризации DBDMDP (dual-band dual-mode and dual-polarized) на основе асимметричной Y-образной микрополосковой линии питания вместе с кольцевым излучателем квадратного сечения. Нагрузкой конструкции являются две пары L-полосок для расширения полосы пропускания низшей моды (центральная частота fc = 9,36 ГГц). Этот сегмент использован для изменения распределения электромагнитного поля и получения дипольного ненаправленного линейно поляризованного LP (linearly polarized) излучения. Секция питания асимметричной Y-образной микрополосковой линией использована для формирования направленного излучения круговой поляризации CP (circular polarization) на более высокой моде (fc = 12,13 ГГц). Результаты измерений показали, что полоса частот по входному сопротивлению по уровню –10 дБ для режима диполя и режима патч-антенны составляет 730 МГц (7,72%, fc = 9,45 ГГц) и 1648 МГц (14,26%, fc = 11,56 ГГц), соответственно. При этом моделированное значение полосы пропускания по коэффициенту эллиптичности в режиме работы патч-антенны по уровню 3-дБ составляет 1280 МГц (10,74%, центральная частота полосы CP fCP = 11,92 ГГц). Максимальные значения коэффициентов передачи для двух мод на частотах fc = 9,36 и 12,13 ГГц составили 1,44 и 2,62 дБи, соответственно. Максимальное пиковое значение коэффициента передачи составило 3,32 дБи на частоте 12,27 ГГц. Данная патч-антенна с одним облучателем может быть использована в приложениях беспроводной связи благодаря своей компактной структуре, значительной ширине полосы, стабильной диаграмме направленности и поляризационно-разнесенному приему.

Ultrathin Dual-Mode Vortex Beam Generator Based on Anisotropic Coding Metasurface

2020 ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves ◽  
Is Design

Abstract In this paper, anisotropic coding metasurfaces is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is design to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

Spurious Suppression Effect by Transmit Bandpass Filters with HTS Dual-Mode Resonators for 5GHz Band

2009 ◽  
Vol E92-C (3) ◽  
pp. 288-295
Author(s):  
Kazunori YAMANAKA ◽  
Kazuaki KURIHARA ◽  
Akihiko AKASEGAWA ◽  
Masatoshi ISHII ◽  
Teru NAKANISHI
Keyword(s):  
Bandpass Filters ◽  
Dual Mode ◽  
Suppression Effect ◽  
Spurious Suppression

DUAL-MODE LINEAR ANALYSIS OF TEMPORAL INSTABILITY FOR POWER-LAW LIQUID SHEET

2016 ◽  
Vol 26 (4) ◽  
pp. 319-347 ◽  
Author(s):  
Han-Yu Deng ◽  
Feng Feng ◽  
Xiao-Song Wu
Keyword(s):  
Power Law ◽  
Linear Analysis ◽  
Liquid Sheet ◽  
Dual Mode ◽  
Temporal Instability

A COMPUTATIONAL STUDY OF A DUAL-MODE RAMJET COMBUSTOR WITH A CAVITY FLAMEHOLDER

2012 ◽  
Vol 11 (6) ◽  
pp. 487-510 ◽  
Author(s):  
Christer Fureby ◽  
J. Tegner ◽  
R. Farinaccio ◽  
Robert Stowe ◽  
D. Alexander
Keyword(s):  
Computational Study ◽  
Dual Mode ◽  
Ramjet Combustor
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