Near-field calculation for reflector antenna with shape of asymmetrical cutting from a paraboloid of revolution

2017 ◽  
Author(s):  
Sergey V. Nechitaylo ◽  
Oleg I. Sukharevsky ◽  
Vitaly A. Vasilets
Keyword(s):  
Near Field ◽  
Reflector Antenna ◽  
Field Calculation ◽  
Paraboloid Of Revolution

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 Installation Uncertainty of Field Level Calculation around a Base Station Antenna

2007 ◽  
Vol 3 (2) ◽  
pp. 115
Author(s):  
Antonio Šarolić ◽  
Borivoj Modlic
Keyword(s):  
Hazard Analysis ◽  
Near Field ◽  
Three Dimensional ◽  
Real Life ◽  
Base Station ◽  
Radiation Hazard ◽  
Specific Situation ◽  
Field Calculation ◽  
Single Antenna ◽  
Level Calculation

In the near field, the antenna pattern provided by the antenna manufacturer is generally not applicable, or shouldbe considered with caution, even for the single antenna in free space. In the real life, antenna is often surrounded by other conductive objects in the immediate vicinity. These objects tend to distort the antenna radiation pattern. Since the electromagnetic field calculation for the coverage or radiation hazard analysis depends on the three-dimensional antenna gain, this effect should be taken into account. This paper suggests the use of "installation uncertainty" that should be added to the field calculation. The amount of this quantity depends on the installation geometry and can be calculated numerically for a specific situation. This paper shows the results of numerical calculations for some typical antenna installation geometries.

A fast and flexible library-based thick-mask near-field calculation method

2015 ◽  
Author(s):  
Xu Ma ◽  
Jie Gao ◽  
Xuanbo Chen ◽  
Lisong Dong ◽  
Yanqiu Li
Keyword(s):  
Calculation Method ◽  
Near Field ◽  
Field Calculation

Fast extreme ultraviolet lithography mask near-field calculation method based on machine learning

2020 ◽  
Vol 59 (9) ◽  
pp. 2829
Author(s):  
Jiaxin Lin ◽  
Lisong Dong ◽  
Taian Fan ◽  
Xu Ma ◽  
Rui Chen ◽  
...  
Keyword(s):  
Machine Learning ◽  
Calculation Method ◽  
Extreme Ultraviolet ◽  
Near Field ◽  
Field Calculation ◽  
Extreme Ultraviolet Lithography ◽  
Ultraviolet Lithography

scholarly journals Substituting EMC emission measurement by field and cable scan method using measured transfer function

2013 ◽  
Vol 11 ◽  
pp. 183-188 ◽  
Author(s):  
D. Rinas ◽  
J. Jia ◽  
A. Zeichner ◽  
S. Frei
Keyword(s):  
Transfer Functions ◽  
Near Field ◽  
Good Alternative ◽  
Emission Measurement ◽  
Far Field ◽  
Field Calculation ◽  
Automotive Components ◽  
Anechoic Chambers ◽  
Cispr 25 ◽  
Space Requirements

Abstract. Today EMC emissions of automotive components are often measured in anechoic chambers by an antenna at fixed position according to CISPR 25 (ALSE-method). The antenna voltage often cannot sufficiently describe the behaviour of the measured electronic components and systems. Furthermore space requirements and costs are very high for the ALSE-method. Field- and cable-scan methods combined with near-field to far-field transformation techniques might be a good alternative. Residual reflections from the walls, the metallic floor, the measuring table, interaction of the antenna with the environment, and other factors affect the measurements. Thus, models which only regard the current distribution for near- and far field calculation cannot produce results equal to a chamber measurement. In this paper methods for computing transfer functions for the substitution of EMC antenna measurements with field- and cable scans in a specified calibration area are introduced. To consider influences of the environment, the environment is characterized in a first step and included with transfer functions in the calculation process for the equivalent ALSE-field.

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