High frequency acoustic transmission loss of perforated plates at normal incidence

2013 ◽  
Vol 134 (2) ◽  
pp. 1090-1101 ◽  
Author(s):  
Vincent Phong ◽  
Dimitri Papamoschou
Keyword(s):  
High Frequency ◽  
Transmission Loss ◽  
Normal Incidence ◽  
Acoustic Transmission ◽  
Perforated Plates

Measurements of high frequency acoustic transmission loss during SAVEX15

2016 ◽  
Vol 140 (4) ◽  
pp. 3065-3065 ◽  
Author(s):  
Su-Uk Son ◽  
Jee Woong Choi ◽  
Seung Woo Lee ◽  
SungHyun Nam ◽  
Sungho Cho
Keyword(s):  
High Frequency ◽  
Transmission Loss ◽  
Acoustic Transmission

scholarly journals Kajian Eksperimental Koefisien Redaman Akustik Bahan Pelapis Plat Dek Kapal

2018 ◽  
Vol 3 (1) ◽  
pp. 41
Author(s):  
Wibowo Harso Nugroho ◽  
Nanang J.H. Purnomo ◽  
Hardi Zen ◽  
Andi Rahmadiansah
Keyword(s):  
Absorption Coefficient ◽  
High Frequency ◽  
Transmission Loss ◽  
Base Material ◽  
Sound Insulation ◽  
Insulation Material ◽  
Base Materials ◽  
Specimen Material ◽  
Ship Classification ◽  
Technical Assessment

With the increasingly strict requirements of the ship classification bureau for permissible noise limits to allow passengers and crew to be more comfortable and secure a technical assessment is required to address the characteristics of the noise. A noise beyond the standard allowed in the vessel can be a problem to the ship operators. This noise problem will greatly affects the crews' comfort and passengers. One method to reduce the noise on a ship is to use sound insulation. This paper describes the method for determining the absorption coefficient α and the transmission loss (TL) through an acoustic test of a concrete insulation in the laboratory. The test was conducted by using the method of impedance tube where a speciment response measured by a microphone. In general, the properties of this insulation material remains as the main base material which is concrete. it has been found that the transmission loss value (TL) is in the range of 10 - 50 dB whereas for the base material the concrete is around 22 - 49 dB but the absorption coefficient α of the specimen material is much higher than the material of the base material especially in high frequency, which ranges from 0.15 to 0.97, whereas for concrete base materials have absorbent coefficient α ranges from 0.01 to 0.02.

Advanced Low Df Dry film Build-up Material on Glass panel for 5G application

2020 ◽  
Vol 2020 (1) ◽  
pp. 000201-000205
Author(s):  
Takenori Kakutani ◽  
Zhong Guan ◽  
Yuya Suzuki ◽  
Muhammad Ali ◽  
Serhat Erdogan ◽  
...  
Keyword(s):  
High Frequency ◽  
Transmission Loss ◽  
Core Material ◽  
Wave Band ◽  
Organic Substrates ◽  
Frequency Filter ◽  
Transmission Characteristics ◽  
Glass Panel ◽  
Low Loss ◽  
Dry Film

Abstract This paper describes the demonstration of a low loss substrate (laminated glass) for high-frequency transmission using a dry film build-up material with low loss tangent (Df). This paper also evaluates filter characteristics and dielectric characteristics of the substrate in the mm-Wave band. The advanced low loss dry film build-up material was newly developed, and applicable to high frequency transmission. This material has a Df of 0.0025 at 10 GHz and also exhibits excellent adhesion and electrical reliability required for advanced dielectric materials. In addition, glass was used as a core material in this paper because of its excellent signal transmission characteristics compared to silicon wafers or organic substrates. To demonstrate the benefit of low loss materials for high frequency transmission, passive components for high frequency filter substrates were fabricated using - 6-inch square thin (0.2mm) glass panel with various build-up materials (Material A with a Df of 0.0025, and Material B with a Df 0.0042 at 10 GHz) laminated. Copper wiring patterns on the dielectric layers were fabricated by a semi-additive process (SAP). Circuit patterns with low pass filters and band pass filters were also fabricated. First, transmission characteristics and characteristic impedances were measured to check the electrical performance. The measured lowest transmission loss of < 1.43 dB at 39 GHz were achieved when Material A was applied as the build-up material. Second, biased-highly accelerated stress test (bHAST) was conducted to evaluate the reliability performance of the substrates with two build-up materials, Material A and a conventional material. The test condition was based on the JEDEC level 2 standard. The substrate with Material A retained good insulation properties over 300 hours of bHAST treatment, demonstrating its excellent insulating performance. In summary, Material A has been shown in this paper to exhibit reduced transmission loss in high-frequency filter substrates at millimeter wave frequencies.

scholarly journals Propagation of narrow-band-high-frequency clicks: Measured and modeled transmission loss of porpoise-like clicks in porpoise habitats

2010 ◽  
Vol 127 (1) ◽  
pp. 560-567 ◽  
Author(s):  
Stacy L. DeRuiter ◽  
Michael Hansen ◽  
Heather N. Koopman ◽  
Andrew J. Westgate ◽  
Peter L. Tyack ◽  
...  
Keyword(s):  
High Frequency ◽  
Transmission Loss ◽  
Narrow Band
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