3-D metal printing in microwave components and antennas applications

2018 ◽  
Author(s):  
Guan-Long Huang ◽  
Zeng-Pei Zhong ◽  
Tao Yuan Atr
Keyword(s):  
Metal Printing ◽  
Microwave Components

scholarly journals A Trial Acoustic Improvement in a Lecture Hall with MPP Sound Absorbers and FDTD Acoustic Simulations

2021 ◽  
Vol 11 (6) ◽  
pp. 2445
Author(s):  
Matteo Cingolani ◽  
Giulia Fratoni ◽  
Luca Barbaresi ◽  
Dario D’Orazio ◽  
Brian Hamilton ◽  
...  
Keyword(s):  
Double Layer ◽  
Speech Intelligibility ◽  
Single Layer ◽  
Lecture Hall ◽  
Full Spectrum ◽  
Metal Printing ◽  
Specific Impedance ◽  
Specific Material ◽  
Acoustic Treatment ◽  
Difference Time

Sound absorbing micro-perforated panels (MPPs) are being increasingly used because of their high quality in terms of hygiene, sustainability and durability. The present work investigates the feasibility and the performance of MPPs when used as an acoustic treatment in lecture rooms. With this purpose, three different micro-perforated steel specimens were first designed following existing predictive models and then physically manufactured through 3D additive metal printing. The specimens’ acoustic behavior was analyzed with experimental measurements in single-layer and double-layer configurations. Then, the investigation was focused on the application of double-layer MPPs to the ceiling of an existing university lecture hall to enhance speech intelligibility. Numerical simulations were carried out using a full-spectrum wave-based method: a finite-difference time-domain (FDTD) code was chosen to better handle time-dependent signals as the verbal communication. The present work proposes a workflow to explore the suitability of a specific material to speech requirements. The measured specific impedance complex values allowed to derive the input data referred to MPPs in FDTD simulations. The outcomes of the process show the influence of the acoustic treatment in terms of reverberation time (T30) and sound clarity (C50). A systematic comparison with a standard geometrical acoustic (GA) technique is reported as well.

Cylindrical radial superlattice conductors for low loss microwave components

2015 ◽  
Vol 117 (10) ◽  
pp. 103911 ◽  
Author(s):  
Arian Rahimi ◽  
Jiyu Wu ◽  
Xiaoyu Cheng ◽  
Yong-Kyu ‘YK’ Yoon
Keyword(s):  
Low Loss ◽  
Microwave Components

Multi-function microwave components based on implantable filters

2016 ◽  
Vol 23 (1) ◽  
pp. 34-51 ◽  
Author(s):  
Xiu Yin Zhang ◽  
Kai Xu Wang ◽  
Yuan Chun Li ◽  
Li Gao ◽  
Xiao Feng Liu
Keyword(s):  
Microwave Components

Topology gradient optimization in 2-D and 3-D for the design of microwave components

2008 ◽  
Vol 50 (10) ◽  
pp. 2739-2743 ◽  
Author(s):  
Hassan Khalil ◽  
Atousa Assadihaghi ◽  
Stéphane Bila ◽  
Dominique Baillargeat ◽  
M. Aubourg ◽  
...  
Keyword(s):  
Gradient Optimization ◽  
Microwave Components

Amorphous Fluoropolymer Films for Superconductive Microwave Components Using High-TcSuperconducting Films

1991 ◽  
Vol 30 (Part 1, No. 11A) ◽  
pp. 2751-2755 ◽  
Author(s):  
Yasuhiro Nagai ◽  
Naobumi Suzuki ◽  
Makoto Sato ◽  
Tsuneo Konaka
Keyword(s):  
Microwave Components ◽  
Fluoropolymer Films

Piezo-controlled microwave devices

2009 ◽  
Vol 1 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Yuriy M. Poplavko ◽  
Vitally I. Molchanov ◽  
Yuriy I. Yakimenko
Keyword(s):  
Millimeter Wave ◽  
Microwave Devices ◽  
Electromechanical Systems ◽  
Telecommunication Systems ◽  
Collision Prevention ◽  
Microwave Components ◽  
Frequency Agile

At present, millimeter wave fast tunable components are required for telecommunication systems, car collision prevention radar, etc. The only mechanical way of control inserts practically no loss in the frequency agile system. That is why micro-electromechanical systems devices are being studied intensively. In an overview, an alternative way – piezo-electromechanical tuning of microwave components – is reported.

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