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.

scholarly journals Vivaldi Antipodal Antenna with High Gain and Reduced Side Lobe Level Using Slot Edge with New Neogothic Fractal by Cantor with Application in Medical Images for Tumor Detection

2020 ◽  
Vol 3 (1) ◽  
pp. 25
Author(s):  
Raimundo Eider Figueredo Sobrinho ◽  
Alexandre Maniçoba De-Oliveira ◽  
Antonio Mendes De oliveira Neto ◽  
Alexandre Jean Rene Serres ◽  
Auzuir R De-Alexandria ◽  
...  
Keyword(s):  
Brain Tumors ◽  
Radiation Pattern ◽  
Near Field ◽  
Computational Simulation ◽  
Side Lobe ◽  
High Gain ◽  
Cantor Set ◽  
Microwave Imaging ◽  
Side Lobe Level ◽  
Maximum Height

This article addresses the study of the Vivaldi Antipodal Antenna (AVA) seeking to improve the gain, decrease the Side Lobe Level (SLL) and the squint, to make the antenna more directive and obtain a more stable radiation pattern. Its intended application lies in the generation of biological microwave imaging to detect brain tumors. With this objective, the Fractal Slot Edge (FSE) technique was applied with a new fractal developed and based on the Cantor set. The application of this fractal, called Cantor Neogothic Fractal (CNG), formed different-sized cavities resulting, in this work, in three antennas that were analyzed through numerical computational simulation together with AVA. The antennas, called CNG9-FSE-AVA, CNG18-FSE-AVA, and CNG27-FSE-AVA, in which 9, 18, and 27 define the maximum height that the fractal reached in each antenna, have areas equal to 354.66 mm2 , 709.33 mm2 and 1064 mm2 , respectively. All antennas achieved the goal, however, CNG27-FSE-AVA presented the best results at 2 GHz, with a gain of 7.84 dBi, SLL -19.80 dB, and squint of -0.10 degree. Additionally, it was proved that the antenna is suitable to generate a near field microwave imaging of tumors in a brain model.

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 3D Printed Corrugated Plate Antennas With High Aperture Efficiency and High Gain at X-Band and Ka-Band

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 30643-30654 ◽  
Author(s):  
Shaker Alkaraki ◽  
Yue Gao ◽  
Samuel Stremsdoerfer ◽  
Edouard Gayets ◽  
Clive G. Parini
Keyword(s):  
High Gain ◽  
Ka Band ◽  
Aperture Efficiency ◽  
X Band ◽  
3D Printed

scholarly journals A New Linear Printed Vivaldi Antenna Array with Low Side Lobe Level and High Gain for the Band 3.5 GHz

2020 ◽  
Author(s):  
Luong Xuan Truong ◽  
Truong Vu Bang Giang ◽  
Tran Minh Tuan
Keyword(s):  
Antenna Array ◽  
Simulated Data ◽  
Bat Algorithm ◽  
Side Lobe ◽  
High Gain ◽  
Control Technique ◽  
Side Lobe Level ◽  
Low Sidelobe ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas

This paper proposes a new design of low sidelobe level (SLL) and high gain linear printed Vivaldi antenna array. The array composes of two parts, which are a linear Vivaldi antenna array and a back reflector. The array consists of 10 single Vivaldi antennas and a series-fed network, those are based on Roger RO4003C substrate (ε = 3.55) with the dimension of 140 x 450 x 1.524 mm3. A new Bat algorithm with the amplitude-only control technique has been applied to optimize the output coefficients of the series-fed network for gaining a low SLL. The simulation results indicate that the proposed antenna provides a low SLL of -29.2 dB in E-plane with a high gain of 16.5 dBi at the frequency of 3500 MHz. A prototype of the proposed antenna array has been fabricated. The measured data has a good agreement with the simulated data.

scholarly journals High-Gain Circularly-Polarized Elliptically-Annular Antenna-Array with Reduced Side-Lobe Level

2020 ◽  
Vol 9 (4) ◽  
pp. 2319-2325
Keyword(s):  
Circular Polarization ◽  
Antenna Array ◽  
Satellite Communication ◽  
Axial Ratio ◽  
Side Lobe ◽  
High Gain ◽  
Side Lobe Level ◽  
Single Element ◽  
Circularly Polarized ◽  
Gain Enhancement

A single feed microstrip patch elliptically annular antenna array has been proposed for high gain circularly polarized (CP) radiation. An array of elliptically annular patches antenna resonates at a frequency of 3.77 GHz which can be used in satellite communication and radar application. A corporate feed network with quarter-wave transformer has been used for uniform excitation of all the array elements. Thus a good circular polarization is obtained by using a single feed with enhanced gain 15.62 dB compared to single patch. The radiation pattern, axial ratio and input impedance of the proposed elliptically annular antenna array is compared with single element elliptically annular antenna. A substantial gain enhancement with low side lobe level (SLL) is observed keeping circular polarization intact. Further, simulated and measured results of the proposed antenna array have been compared and found that axial ratio and gain are in good agreement.

scholarly journals Low Side Lobe Tapered Slot Antenna with High Gain Using Gradient Refractive Index Metamaterial for Ultra Wideband Application

2017 ◽  
Vol 6 (4) ◽  
pp. 63-69 ◽  
Author(s):  
R. Singha ◽  
D. Vakula
Keyword(s):  
Refractive Index ◽  
Beam Width ◽  
Parallel Line ◽  
Side Lobe ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Side Lobe Level ◽  
Beam Focusing ◽  
Gradient Refractive Index

A broadband gradient refractive index (GRIN) metamaterial is used to improve the gain of the tapered slot antenna. The proposed metamaterial is capable of reducing the side lobe level of the antenna. The gradient refractive index (GRIN) metamaterial is constructed by using non-resonant parallel-line unit cells with different refractive index. Due to the non-resonant structure, the proposed unit cell exhibits low loss and large frequency bandwidth. The metamaterial, whose effective refractive index is lower than that of the substrate on which the antenna is printed. Therefore, the proposed metamaterial is act as a regular lens in beam focusing. The GRIN metamaterial is integrated in front of the antenna which has the capability to manipulate electromagnetic wave accurately. The measurement results indicate that the reflection coefficient of the antenna is below -10 dB over the frequency band from 3 to 11 GHz. The radiation pattern of the antenna shows the beam width becomes narrow and directive with low side lobe level. The peak gain is increased by 2.1 dB at 9.5 GHz.

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