scholarly journals A Ka-Band Cylindrical Paneled Reflectarray Antenna

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 654 ◽  
Author(s):  
Francesco Greco ◽  
Luigi Boccia ◽  
Emilio Arnieri ◽  
Giandomenico Amendola
Keyword(s):  
High Gain ◽  
Cylindrical Symmetry ◽  
Radiation Efficiency ◽  
Ka Band ◽  
Cylindrical Reflector ◽  
Geometric Relation ◽  
Reflectarray Antenna ◽  
Parabolic Reflectors ◽  
Reflecting Surface ◽  
Continuous Metal

Cylindrical parabolic reflectors have been widely used in those applications requiring high gain antennas. Their design is dictated by the geometric relation of the parabola, which relate the feed location, f, to the radiating aperture, D. In this work, the use of reflectarrays is proposed to increase D without changing the feed location. In the proposed approach, the reflecting surface is loaded with dielectric panels where the phase of the reflected field is controlled using continuous metal strips of variable widths. This solution is enabled by the cylindrical symmetry and, with respect to rectangular patches or to other discrete antennas, it provides increased gain. The proposed concept has been evaluated by designing a Ka-band antenna operating in the Rx SatCom band (19–21 GHz). A prototype has been designed and the results compared with the ones of a parabolic cylindrical reflector using the same feed architecture. Simulated results have shown how this type of antenna can provide higher gain in comparison to the parabolic counterpart, reaching a radiation efficiency of 65%.

scholarly journals Ka-Band Lightweight High-Efficiency Wideband 3D Printed Reflector Antenna

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Yu Zhai ◽  
Ding Xu ◽  
Yan Zhang
Keyword(s):  
High Efficiency ◽  
Near Field ◽  
Side Lobe ◽  
High Gain ◽  
Reflector Antenna ◽  
Field Analysis ◽  
Side Lobe Level ◽  
Ka Band ◽  
3D Printed ◽  
Reflecting Surface

This paper presents a lightweight, cost-efficient, wideband, and high-gain 3D printed parabolic reflector antenna in the Ka-band. A 10 λ reflector is printed with polylactic acid- (PLA-) based material that is a biodegradable type of plastic, preferred in 3D printing. The reflecting surface is made up of multiple stacked layers of copper tape, thick enough to function as a reflecting surface (which is found 4 mm). A conical horn is used for the incident field. A center-fed method has been used to converge the energy in the broadside direction. The proposed antenna results measured a gain of 27.8 dBi, a side lobe level (SLL) of −22 dB, and a maximum of 61.2% aperture efficiency (at 30 GHz). A near-field analysis in terms of amplitude and phase has also been presented which authenticates the accurate spherical to planar wavefront transformation in the scattered field.

A high gain CMOS LNA for Ka-Band Communication System

2019 ◽  
Author(s):  
Shengjia Liao ◽  
Zhengdong Jiang ◽  
Yiming Yu ◽  
Chenxi Zhao ◽  
Hongyan Tang ◽  
...  
Keyword(s):  
Communication System ◽  
High Gain ◽  
Ka Band ◽  
Cmos Lna

Design and Analysis of High Gain Slotted SIW Array Antennas at Ka-Band

2020 ◽  
Author(s):  
Bharath Kunooru ◽  
Srujana Vahini Nandigama ◽  
Rama Krishna Dasari
Keyword(s):  
High Gain ◽  
Ka Band ◽  
Array Antennas

High Gain Planar Antenna Array for Ka Band SAR Applications

2018 ◽  
Author(s):  
Sheng Ye ◽  
Junyi Hu ◽  
Liang Li ◽  
Yanbing Ma ◽  
Kun Qin
Keyword(s):  
Antenna Array ◽  
High Gain ◽  
Planar Antenna ◽  
Ka Band ◽  
Planar Antenna Array

scholarly journals Ka-band Vivaldi Antenna with Novel Core Element for High-Gain

2017 ◽  
Author(s):  
Manh-Ha Hoang ◽  
Kansheng Yang ◽  
M. John ◽  
P. McEvoy ◽  
M. Ammann
Keyword(s):  
High Gain ◽  
Core Element ◽  
Ka Band ◽  
Vivaldi Antenna

scholarly journals Feasibility evaluations of three-dimensional-printed high-gain reflectarray antenna for W-band applications

2018 ◽  
Vol 7 (6) ◽  
pp. 230-235 ◽  
Author(s):  
Shunichi Futatsumori ◽  
Kazuyuki Morioka ◽  
Akiko Kohmura ◽  
Nobuhiro Sakamoto ◽  
Tomio Soga ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Gain ◽  
W Band ◽  
Reflectarray Antenna

scholarly journals Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 961
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Jose A. Encinar ◽  
Giovanni Toso
Keyword(s):  
Satellite Communications ◽  
Lower Number ◽  
Orthogonal Polarization ◽  
Ka Band ◽  
Satellite Applications ◽  
Deviation Factor ◽  
Reflectarray Antenna ◽  
First Time ◽  
Spot Beam ◽  
Multiple Spot

This paper presents a novel multibeam transmitting dual-reflectarray antenna able to generate a complete multiple spot coverage from a geostationary satellite in Ka-band (20 GHz). The bifocal design technique has been exploited for the first time to reduce by 50% the beam deviation factor with respect to the equivalent monofocal antenna, allowing to produce adjacent beams separated by only 0.56° in the antenna offset plane. In order to guarantee an acceptable spillover, the main reflectarray has been oversized in the same plane where the beams are compressed, resulting in an elliptical reflectarray of 3.5 m × 1.8 m. The interleaved beams required to provide the complete multi-spot coverage are produced in the orthogonal polarization, using the same aperture and feeds. The proposed antenna requires a smaller main aperture (about half of the area) and a lower number of feeds than other configurations that use a single oversized reflector to generate a complete multi-spot coverage, showing promising results for communication satellite applications in the Ka-band.

scholarly journals Real-Time Mode Switching and Beam Scanning of High-Gain OAM Waves Using a 1-Bit Reconfigurable Reflectarray Antenna

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2181
Author(s):  
Ziyang Wang ◽  
Xiaotian Pan ◽  
Fan Yang ◽  
Shenheng Xu ◽  
Maokun Li
Keyword(s):  
Real Time ◽  
Dimensional Space ◽  
Large Angle ◽  
High Gain ◽  
Mode Switching ◽  
Effective Control ◽  
Vortex Beam ◽  
Beam Scanning ◽  
The Future ◽  
Reflectarray Antenna

A reconfigurable electromagnetic surface has been studied to realize the adjustable orbital angular momentum (OAM) beams for real-time wireless communication and dynamic target detection in the future. OAM mode switching realized by many previous designs suffers from low gains without OAM beam scanning. In this article, a 1-bit reconfigurable reflectarray antenna is designed, fabricated, and tested for the real-time control of OAM mode switching and large-angle vortex beam scanning in three-dimensional space. The proposed reflectarray surface is composed of 1-bit electronically reconfigurable cells, and the size is 24 λ × 24 λ with 2304 units. The reconfigurable element is designed by using a radiation patch loading a PIN diode with effective control of two states, “ON” and “OFF”, for the demand of 180° phase difference. The reflectarray surface can be assigned to a code sequence of 0 or 1 by the Field-Programmable Gate Array (FPGA) in real time. Henceforth, the coding surface can dynamically control the generation of high-gain OAM beams, where only the optimized phase distributions on the surface need to be changed according to demand. To verify the concept, a large-scale reflectarray surface is fabricated and measured with an oblique feed at 15°. Different OAM-carrying phase distributions for different OAM beam states are calculated and tested. The test results show that the OAM mode switching between l = 1 and l = 2 is realized, and other variable modes such as l = 3 or l = 5 can also be achieved by modifying the phase encoding sequence. Furthermore, the direction of the vortex beams can be accurately controlled with gains over 20 dBi, and the large-angle vortex beam scanning is verified. Therefore, all results demonstrate that the proposed 1-bit reconfigurable reflectarray is efficient for the regulation and control of OAM-carrying beams for the demand of real-time dynamic wireless communications in the future.

scholarly journals Frequency-Diverse Bunching Metamaterial Antenna for Coincidence Imaging

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1817 ◽  
Author(s):  
Mengran Zhao ◽  
Shitao Zhu ◽  
Jianxing Li ◽  
Hongyu Shi ◽  
Juan Chen ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Random Distribution ◽  
Correlation Coefficients ◽  
Radiation Efficiency ◽  
Circular Array ◽  
Radiation Patterns ◽  
Ka Band ◽  
Metamaterial Antenna ◽  
Imaging Experiment ◽  
Coincidence Imaging

A frequency-diverse bunching metamaterial antenna for coincidence imaging in the Ka band is proposed in this paper. The bunching metamaterial antenna includes a broadband circular array and a frequency-diverse bunching metalens. Firstly, in order to enhance the bunching characteristic, the broadband circular array is designed based on the 60-degree beamwidth design to generate radiation patterns from 32 GHz to 36 GHz. Then, types of metamaterial elements with different transmission phases are selected to form the frequency-diverse bunching metalens based on a random distribution design and gradient zoom coefficient design. Moreover, the bunching metamaterial antenna is constituted by loading the frequency-diverse bunching metalens to the broadband circular array, which can generate frequency-diverse bunching random radiation patterns with beamwidth less than 100 degrees from 32 GHz to 36 GHz. Furthermore, the performances of the bunching metamaterial antenna, including the reflection coefficient, the radiation efficiency, and the correlation coefficients of radiation patterns at different frequencies are evaluated. Finally, the coincidence imaging experiment is implemented using the bunching metamaterial antenna and the image of the target is reconstructed successfully. The design is verified by simulations and measurements.

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