A DUAL-MODE APERATURE-COUPLED STACK ANTENNA FOR WLAN DUAL-BAND AND CIRCULAR POLARIZATION APPLICATIONS

2010 ◽  
Vol 17 ◽  
pp. 193-202 ◽  
Author(s):  
Ji-Chyun Liu ◽  
Bing-Hao Zeng ◽  
Chin-Yen Liu ◽  
Hui-Chi Wu ◽  
Chung-Chi Chang
Keyword(s):  
Circular Polarization ◽  
Dual Band ◽  
Dual Mode

scholarly journals Dual-Mode Circular Polarization Selective Surface Cell for Single-Layer Dual-Band Circularly Polarized Reflectarray

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Zheng Liu ◽  
Xue Lei ◽  
Jun-Mo Wu ◽  
Zhi-Jian Xu
Keyword(s):  
Circular Polarization ◽  
Three Dimensional ◽  
Discrimination Performance ◽  
Single Layer ◽  
Axial Ratio ◽  
Dual Band ◽  
Dual Mode ◽  
Circularly Polarized ◽  
Cell Rotation ◽  
Measured Efficiency

A dual-mode circular polarization selective surface (CPSS) cell based on a modification of the Pierrot cell is presented for single-layer dual-band circularly polarized (CP) reflectarray antenna design. To achieve dual-mode CP discrimination performance, the improved three-dimensional geometry and the high-order resonances of the CPSS cell are utilized. The required phase shifts in both modes are obtained by varying the cell rotation angle. A single-layer dual-band reflectarray operating with orthogonal CPs has been fabricated and tested. Measured results show the peak gains of 25.2 dBi at 11.6 GHz with 31% 3 dB axial ratio (AR) bandwidth and 26.5 dBi at 14.6 GHz with 32% 3 dB AR bandwidth, respectively. The measured efficiency is 41.2% at 11.6 GHz and 55.5% at 14.6 GHz.

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.

3-D Printed Dual-Band Filter Based on Spherical Dual-Mode Cavity

2021 ◽  
pp. 1-1
Author(s):  
Yuan Chen ◽  
Gang Zhang ◽  
Jiasheng Hong ◽  
Zhengyu Sun ◽  
Jiquan Yang ◽  
...  
Keyword(s):  
Dual Band ◽  
Dual Mode ◽  
Band Filter

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

A miniature dual-band filter based on microstrip dual-mode resonators

2012 ◽  
Vol 38 (9) ◽  
pp. 839-842 ◽  
Author(s):  
B. A. Belyaev ◽  
A. M. Serzhantov ◽  
V. V. Tyurnev
Keyword(s):  
Dual Band ◽  
Dual Mode ◽  
Band Filter

Millimeter-wave dual-mode and dual-band switchable Gilbert up-conversion mixer in 65-nm CMOS process

2021 ◽  
pp. 1-5
Author(s):  
Fang Zhu ◽  
Guo Qing Luo
Keyword(s):  
Millimeter Wave ◽  
Complementary Metal Oxide Semiconductor ◽  
Local Oscillator ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Dual Band ◽  
Cmos Process ◽  
Pumping Power ◽  
Dual Mode ◽  
Dc Power

Abstract In this paper, a millimeter-wave (MMW) dual-mode and dual-band switchable Gilbert up-conversion mixer in a commercial 65-nm complementary metal oxide semiconductor (CMOS) process is presented. By simply changing the bias, the proposed CMOS Gilbert up-conversion mixer can be switched between subharmonic and fundamental operation modes for MMW dual-band applications. With a low local oscillator pumping power of 3 dBm and low dc power consumption of 6 mW, the proposed CMOS Gilbert up-conversion mixer exhibits a measured conversion gain of −0.5 ± 1.5 dB from 37 to 50 GHz and 2.5 ± 1.5 dB from 17.5 to 32 GHz for the subharmonic and fundamental modes, respectively.

Reconfigurable Frequency Textile Antenna with Circular Polarization Using Slotted Technique

2015 ◽  
Vol 781 ◽  
pp. 81-84 ◽  
Author(s):  
Shakhirul Mat Salleh ◽  
Muzammil Jusoh ◽  
Abdul Hafiizh Ismail ◽  
Muhammad Ramlee Kamarudin ◽  
Mohamad Imran Ahmad ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Axial Ratio ◽  
Dual Band ◽  
Operating Frequency ◽  
Pin Diode ◽  
Switching Element ◽  
Band Frequency ◽  
Microstrip Patch ◽  
Textile Antenna

This paper presents a reconfigurable frequency microstrip patch textile antenna using slotted technique. The switchable frequency is achieved by implementing three PIN diode switches at the slotted ground of the antenna. It is discovered that the switching element is capable to configure the frequency at six different states of operating frequencies between 1.575 GHz until 2.45 GHz. With certain switches configuration, the antenna is proficient to produce a dual-band frequency of band 1; 1.575 GHz and 2.45 GHz and band 2; 1.588 GHz and 2.36 GHz. Besides, the antenna has successfully perform an axial ratio of less than <3 dB at the GPS operating frequency of 1.575 GHz. A shieldit super is used for the antenna radiator and felt fabric as the antenna substrate. The design and simulated result shows that the presented antenna is potential to be implemented in GPS and Wi-Fi applications.

Design of a compact dual-band diplexer with dual-mode cavities

2012 ◽  
Author(s):  
H. Ezzeddine ◽  
P. Mazet ◽  
S. Bila ◽  
S. Verdeyme ◽  
F. Seyfert ◽  
...  
Keyword(s):  
Dual Band ◽  
Dual Mode
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