Simulation and Analysis of the Regular Mesh Performance Based on the Deployable Reflector Antenna

2013 ◽  
Vol 765-767 ◽  
pp. 2746-2749
Author(s):  
Dian Fu Zhang ◽  
Ping Li ◽  
Yu Peng ◽  
Wei Dong Hu
Keyword(s):  
Magnetic Flux ◽  
Electric Field ◽  
Reflector Antenna ◽  
Main Lobe ◽  
Pore Length ◽  
Tangential Electric Field ◽  
Woven Structures ◽  
Reflecting Surface ◽  
Deployable Reflector ◽  
Lobe Width

Based on three regular mesh shapes of the deployable reflector antenna,the article considers the property that the aperture section of the mesh reflecting surface does not exist, the net surface tangential electric field is continuous and the induced magnetic flux does not exist. The gain and main lobe 3dB width of particle feed reflector antenna with diffident woven structures and pore length is simulated by FEKO software.The results showed that when the hole is about 3/40 times of the wavelength, the weaving diameter is about 4/50 of the wavelength The maximum direction coefficient of the triangle weave mesh antenna is 0.3dB lower than the physical metal reflecting surface,and 0.60 higher in the main lobe width.

Origami Deployable Reflector Antenna for CubeSats

2021 ◽  
Author(s):  
Louis Dufour ◽  
Leri S. Datashvili ◽  
Francois Guinot ◽  
Hervé Legay ◽  
George Goussetis
Keyword(s):  
Reflector Antenna ◽  
Deployable Reflector

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 Non-magnetic generating electricity

2021 ◽  
Author(s):  
Shuai Yang
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Electric Field ◽  
Induced Current ◽  
Current Generation ◽  
Scientific Cognition ◽  
The Past ◽  
Directional Movement ◽  
Voltage Generation ◽  
The Magnetic Field

Abstract In the past scientific cognition, changes in the magnetic field produce electric field, so when there is current and voltage generation, need to have a change in magnetic flux, However, in the process of studying the nature of magnetization, we found that the microscopic formation of a magnetic field is the directional movement of positive and negative charges, under the guidance of this theory, we use other methods, realize the separation of positive and negative charges, observation of induced current generation, this can be used as another way to generate electricity.

scholarly journals Development and Analysis of New NLFM Waveform for Achieving Sidelobe Reduction and Narrowing of Main lobe Width

2021 ◽  
Vol 9 (7) ◽  
pp. 885-889
Keyword(s):  
Doppler Effect ◽  
Background Noise ◽  
Sampling Rate ◽  
Ambiguity Function ◽  
Main Lobe ◽  
The Doppler Effect ◽  
The Impact ◽  
Lobe Width

Aimed at narrowing main lobe width and reduced sidelobe values, we developed three new NLFM chirp waveforms. The ambiguity function and the impact of sampling rate and compression ratios of these waveforms are analyzed. Their performance is examined against the doppler effect and background noise. One of the three designed NLFM chirp waveforms is useful in applications requiring side lobes of -50 dB and narrow main lobe width. The new waveform could achieve reduced sidelobes and narrow main lobe width compared to LFM and other NLFM waveforms

Excitation series design and pulse compression synthesis for high-resolution Lamb wave inspection

2018 ◽  
Vol 18 (5-6) ◽  
pp. 1464-1478
Author(s):  
Jiadong Hua ◽  
Liang Zeng ◽  
Jing Lin ◽  
Liping Huang
Keyword(s):  
Lamb Wave ◽  
Pulse Compression ◽  
Lamb Waves ◽  
Dispersion Compensation ◽  
Synthesis Method ◽  
Side Lobe ◽  
Main Lobe ◽  
Window Functions ◽  
Windowing Technique ◽  
Lobe Width

Lamb wave pulse compression is a promising technique for ultrasonic nondestructive evaluation and structural health monitoring, in which the excitation waveform is designed to exhibit attractive auto-correlation characteristics including short main-lobe width and small side-lobe amplitude. However, narrowing main-lobe will increase side-lobe amplitude, and vice versa. Conventional time windowing technique is a balance between main-lobe width and side-lobe amplitude. An improvement over time windowing is proposed using pulse compression synthesis method. In this method, a series of excitation waveforms are used to actuate Lamb waves, each response is processed by pulse compression, and all the compression signals are summed together. The excitation series are constructed as linear chirps weighted with different combinations of rectangular and Hanning window functions. The selection of the combination coefficients is optimized to ensure best signal summation. The effectiveness of the proposed method is demonstrated by an experiment, and the robustness to inaccuracy in dispersion compensation is also evaluated. Application of the proposed method for damage detection is demonstrated by a further experiment.

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