Design and evaluation of a wideband reflectarray antenna using cross dipole with double‐ring elements

2019 ◽  
Vol 29 (9) ◽  
Author(s):  
Lingasamy Veluchamy ◽  
M. Gulam Nabi Alsath ◽  
Krishnasamy T. Selvan
Keyword(s):  
Double Ring ◽  
Reflectarray Antenna ◽  
Ring Elements

Single-Layer Broadband Circularly Polarized Reflectarray with Subwavelength Double-Ring Elements

2015 ◽  
Vol 35 (4) ◽  
pp. 217-226 ◽  
Author(s):  
Xian-Jiang Zhong ◽  
Lei Chen ◽  
Yan Shi ◽  
Xiao-Wei Shi
Keyword(s):  
Single Layer ◽  
Circularly Polarized ◽  
Double Ring ◽  
Ring Elements

scholarly journals Development of an X-Band Reflectarray Antenna for Satellite Communications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bing Ma ◽  
Fan Lu ◽  
Guoping Zhi ◽  
Xin Xue ◽  
Xiangni Zhao ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Satellite Communications ◽  
Gain Bandwidth ◽  
Aperture Efficiency ◽  
Microstrip Patch ◽  
Right Hand ◽  
X Band ◽  
Reflectarray Antenna ◽  
Ring Elements

AbstractAn X-band reflectarray antenna using 16 × 12 double square ring elements for satellite communications is proposed in this paper. The feed is a 4 × 3 elements microstrip patch array designed to create edge taper of approximately − 10 dB. A prototype with right-hand circular polarization (RHCP) is manufactured and tested, and the good agreements between simulations and measurements are demonstrated. The good performance is obtained with the aperture efficiency of 40.7% and the 3-dB gain bandwidth of about 10% which is beneficial to nanosatellites.

Design of a K-band reflectarray antenna using double square ring elements

2011 ◽  
Vol 54 (2) ◽  
pp. 394-398 ◽  
Author(s):  
Bing Ma ◽  
Mingyao Xia ◽  
Lubin Yan
Keyword(s):  
Reflectarray Antenna ◽  
Ring Elements ◽  
K Band

Double Ring-Closing Approach for the Synthesis of 2,3,6,7-Substituted Anthracene Derivatives

2020 ◽  
Author(s):  
Birgit Meindl ◽  
Katharina Pfennigbauer ◽  
Berthold Stöger ◽  
Martin Heeney ◽  
Florian Glöcklhofer
Keyword(s):  
Wittig Reaction ◽  
Condensation Reaction ◽  
Synthetic Methods ◽  
Anthracene Derivative ◽  
Double Ring ◽  
Mild Conditions ◽  
Wide Range ◽  
Anthracene Derivatives

Anthracene derivatives have been used for a wide range of applications and many different synthetic methods for their preparation have been developed. However, despite continued synthetic efforts, introducing substituents in some positions has remained difficult. Here we present a method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions followed by a deprotection and intramolecular double ring-closing condensation reaction. Further modification of the precursor is expected to enable the introduction of additional substituents in other positions and may even enable the synthesis of fully substituted anthracene derivatives by the presented approach.<br>

Sign in / Sign up

Export Citation Format

Share Document