Dual-band circularly polarized textile antenna with split-ring slot for off-body 4G LTE and WLAN applications

2018 ◽  
Vol 124 (8) ◽  
Author(s):  
Eissa A. Mohammad ◽  
Hasliza A. Rahim ◽  
Ping Jack Soh ◽  
Mohd Faizal Jamlos ◽  
Mohamedfareq Abdulmalek ◽  
...  
Keyword(s):  
Dual Band ◽  
Split Ring ◽  
Circularly Polarized ◽  
Textile Antenna ◽  
4G Lte

A PRINTED DUAL-BAND DUAL-SENSE CIRCULARLY POLARIZED METAL-STRIP ANTENNA WITH DOUBLE SPLIT-RING ELEMENTS

2014 ◽  
Vol 53 ◽  
pp. 155-163 ◽  
Author(s):  
Guowei Zhang ◽  
Fu-Shun Zhang ◽  
Ya-Li Yao ◽  
Li Jiang ◽  
Qichang Li
Keyword(s):  
Metal Strip ◽  
Dual Band ◽  
Split Ring ◽  
Circularly Polarized ◽  
Ring Elements

Dual-band reflection polarization converter for circularly polarized waves based on a zigzag asymmetric split ring resonator

2021 ◽  
Vol 129 (1) ◽  
pp. 014901
Author(s):  
Shengyuan Shi ◽  
Kefang Qian ◽  
Wentao Gao ◽  
Jing Dai ◽  
Minhua Li ◽  
...  
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Dual Band ◽  
Polarization Converter ◽  
Split Ring ◽  
Circularly Polarized ◽  
Polarized Waves

Dual-Band Circularly Polarized Split Ring Resonators Loaded Square Slot Antenna

2016 ◽  
Vol 64 (8) ◽  
pp. 3640-3645 ◽  
Author(s):  
Krishnamoorthy Kandasamy ◽  
Basudev Majumder ◽  
Jayanta Mukherjee ◽  
Kamla Prasan Ray
Keyword(s):  
Ring Resonators ◽  
Dual Band ◽  
Slot Antenna ◽  
Split Ring ◽  
Circularly Polarized ◽  
Split Ring Resonators

scholarly journals Circularly Polarized Array with Enhanced Isolation Using Magnetic Metamaterials

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1356 ◽  
Author(s):  
Bo Li ◽  
Chun Yang ◽  
Zhanping Yang ◽  
Junwei Shi ◽  
Jianxing Li ◽  
...  
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Active Element ◽  
Axial Ratio ◽  
Satellite System ◽  
Ring Resonators ◽  
Dual Band ◽  
Split Ring ◽  
Circularly Polarized ◽  
Beidou Navigation Satellite System

This article proposes a 2 × 2 circularly polarized array with enhanced isolation that could be used in the adaptive anti-jamming system for China’s Beidou Navigation Satellite System (BDS), and a compact dual-band microstrip antenna for GPS and GLONASS is designed at the center part of the array for multiple modes operation. The substrate integrated split ring resonators with negative effective permeability are used as the magnetic metamaterials. Four groups of the magnetic metamaterials are placed between the BDS antenna elements, which could constrain the EM filed in the area of the active element, and then significantly reduce the mutual coupling among the elements. The results tell that the isolation among the BDS elements are improved by more than 10 dB, and the performance of radiation patterns and the axial ratio of each BDS elements are also apparently improved compared to the array without magnetic metamaterials.

scholarly journals Design of Ku- and Ka-Band Flat Dual Circular Polarized Reflectarrays by Combining Variable Rotation Technique and Element Size Variation

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 985 ◽  
Author(s):  
Rafael Florencio ◽  
Daniel Martinez-de-Rioja ◽  
Eduardo Martinez-de-Rioja ◽  
Jose A. Encinar ◽  
Rafael R. Boix ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Size Variation ◽  
Dual Band ◽  
Split Ring ◽  
Ka Band ◽  
Circularly Polarized ◽  
Cpu Time ◽  
Element Size ◽  
Rotation Technique ◽  
Focused Beams

In this work circularly polarized flat reflectarray antennas are designed to work at downlink frequencies in Ku- and Ka-band. The design approach for circular polarization radiation combines both the variable rotation technique (VRT) and the element size variation technique (ESVT). The reflectarray element employed consists of a rotable split ring operating at 12 GHz (Ku-band) that surrounds two orthogonal sets of parallel dipoles of variable size operating at 20 GHz (Ka-band). Rotations of split rings and different sizes of dipoles are exploited as degrees of freedom by VRT and ESVT for designing focused beams dual band dual circular polarized reflectarrays. The split ring can be used to achieve single focused beams for circular polarization by VRT at 12 GHz, and the set of orthogonal dipoles can be used to achieve two focused beams for dual circular polarization by ESVT at 20 GHz. In this way, the reflectarray element has been used to design two flat dual band circularly polarized reflectarrays that generate three pencil beams either in the same direction or in different directions: one pencil beam with right-hand circular polarization (RHCP) at 12 GHz and two pencil beams with both RHCP and left-hand circular polarization (LHCP) at 20 GHz. The designed reflectarrays are carried out under local periodicity assumption by means of in-house electromagnetic software that applies the Method of Moments in the Spectral Domain. Validations of the in-house electromagnetic software show significant CPU time savings with respect to CPU time consumption provided by commercial software of general purpose as CST electromagnetics software. Numerical results of radiation patterns produced by the designed reflectarrays show efficiencies around 65% and a bandwidth of 6% for a main beam cross-polarization discrimination of 25 dB. The numerical results are satisfactorily validated by CST software and a tolerance errors study has been numerically carried out with acceptable results.

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