scholarly journals Loss Simulation Analysis and Optimization of U-Groove Leaky Coaxial Cable

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Junguo Gao ◽  
Zhipeng Ma ◽  
Wenhua Yang ◽  
Xiaohong Zhang
Keyword(s):  
Transmission Loss ◽  
Simulation Analysis ◽  
Signal Transmission ◽  
Coaxial Cable ◽  
National Standard ◽  
High Signal ◽  
Coupling Loss ◽  
Outer Conductor ◽  
Parking Lot ◽  
Groove Structure

Leakage coaxial cable is a kind of coaxial cable with various slot structures on the outer conductor of the cable. It can transmit signal and transmit or receive signal and has dual functions of signal transmission line and antenna. Leakage cable has the advantages of strong environmental adaptability, uniform signal coverage, and less attenuation. It is not only widely used in closed or semiclosed space with high signal reception quality, such as tunnels, subway, underground parking lot, and elevators but also can realize security and theft-proof monitoring and protection in some areas, such as oil wells, mining fields and natural resource protection areas, military fortresses, museums, airports, banks, and schools. This paper introduces the classification and electrical parameters of leaky coaxial cables. On the basis of U-groove leaky coaxial cables, the relationship between the parameters of groove holes in U-groove and the loss of leaky coaxial cables is simulated and analyzed by HFSS software. The improved method of U-groove structure is obtained, and the curved hook-groove leaky coaxial cables are designed according to this method. The simulation results show that the coupling loss of the cable is lower than that of the U-groove leakage cable, and the transmission loss is still within the national standard. It lays a theoretical foundation for the design and development of leaky coaxial cable with low coupling loss.

Interventional Mr imaging

1997 ◽  
Vol 38 (1) ◽  
pp. 43-46
Author(s):  
R. P. J. Joensuu ◽  
R. E. Sepponen ◽  
A. E. Lamminen ◽  
C.-G. M. Standertskjöld-Nordenstam
Keyword(s):  
Mr Imaging ◽  
Signal To Noise Ratio ◽  
Coaxial Cable ◽  
High Signal ◽  
The Poor ◽  
Imaging Sequence ◽  
Reference Phantom ◽  
Interventional Mr ◽  
Interventional Devices ◽  
Interventional Mr Imaging

Purpose: The poor localization facility of interventional instruments in MR imaging has been one of the major obstacles to the popularization of interventional MR imaging. It has been suggested that the Overhauser enhancement be used to generate markers of small size and high visibility. This article studies the feasibility of a localization marker based on this method. Material and Methods: A small Overhauser marker was constructed on the tip of a coaxial cable and comparative images were taken by a 0.23 T imager with and without electron spin irradiation. Results: During irradiation an enhanced signal intensity from the marker was observed. The signal from the marker also exceeded the signal from a 0.25 mmol MnCl2 reference phantom. Conclusion: Its small size and high signal-to-noise ratio, together with immunity to most system nonlinearities and imaging errors, makes the Overhauser marker a promising localization method for the accurate positioning of interventional devices. The method may be applied at any field strength, and markers are visible in images obtained with any practical imaging sequence.

Modeling and Optimization Design of Signal Interconnect Channel Considering Signal Integrity in Three Dimensional Integrated Circuits

2021 ◽  
Vol 16 (5) ◽  
pp. 773-780
Author(s):  
Bing-Jie Li ◽  
Zhen-Song Li ◽  
Yan-Ping Zhao ◽  
Zheng-Wang Li ◽  
Min Miao
Keyword(s):  
Performance Optimization ◽  
High Speed ◽  
Optimization Design ◽  
Channel Model ◽  
Transmission Loss ◽  
Coupling Effect ◽  
Signal Integrity ◽  
Signal Transmission ◽  
Equivalent Circuit Model ◽  
Transmission Performance

The signal integrity (SI) analysis of a high-speed signal interconnect channel composed of through silicon vias (TSVs) and horizontal re-distribution layers (RDL) is carried out, and the problems of SI, such as transmission loss, crosstalk and coupling effect in the transmission channel, are analyzed and studied. These signal integrity issues are considered in this paper, a signal interconnect channel model is proposed and the equivalent circuit model is deduced as well. Compared with the traditional one, this interconnect channel model has better performance in SI. Further sweep frequency analysis is carried out for different material parameters to achieve signal transmission performance optimization aimed at this model. Test samples of the proposed signal interconnect channel model are designed and fabricated according to the process index, and measured to verify the actual transmission performance. The design and optimization rule of high-speed signal interconnect channel are summarized which proved that the proposed structure has more advantages in signal transmission performance, and has important guiding significance for practical design.

scholarly journals Measurements of Building Transmission Loss and Delay Spread at 2.5 GHz

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
L. H. Gonsioroski ◽  
L. da Silva Mello
Keyword(s):  
Transmission Loss ◽  
Signal Transmission ◽  
Delay Spread ◽  
Dispersion Parameters ◽  
Rms Delay Spread ◽  
Urban Buildings ◽  
Time Dispersion ◽  
The Mean ◽  
Mean Excess Delay

This paper presents the results of measurements of signal transmission loss at 2.5 GHz through 10 urban buildings. This allows the characterization of different types of buildings by effective attenuation constants and consideration of the contribution of the transmitted signal in microcell coverage predictions. Power delay profiles (PDPs) of the received signal were also measured and used to determine the time dispersion parameters of the channel, including the mean excess delay and the rms delay spread.

Effect of surface finishing on signal transmission loss of microstrip copper lines for high-speed PCB

2019 ◽  
Vol 30 (17) ◽  
pp. 16226-16233 ◽  
Author(s):  
Yuanming Chen ◽  
Yali Gao ◽  
Xiaofeng Jin ◽  
Xuan Zhou ◽  
Shouxu Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Transmission Loss ◽  
Signal Transmission ◽  
Surface Finishing ◽  
Effect Of Surface

Design of Solder Alloy Composition for Semi-Flexible Coaxial Cable Holistic Tin-Plating Application

2013 ◽  
Vol 746 ◽  
pp. 434-439
Author(s):  
Fang Jie Cheng ◽  
Bao Xiang Wang ◽  
Ying Wang ◽  
Li Jun Yang ◽  
Yu Kun Chen
Keyword(s):  
Solder Alloy ◽  
Oxidation Rate ◽  
Coaxial Cable ◽  
P Element ◽  
Interfacial Bonding Strength ◽  
Outer Conductor ◽  
Plate Shape ◽  
Static Oxidation ◽  
Tin Plating ◽  
Metallic Compounds

Holistic tin-plating on the outer conductor is one of the key processes in the manufacture of semi-flexible coaxial cable. In this study, a tin-based solder alloy was developed for this special tin-plating process. For this new solder alloy, the molten solder's antioxidant performance, the morphology of inter-metallic compounds (IMCs) at the solder/copper interface and the dissolution rate of outer conductor during tin-plating process were studied. The results indicate that when the addition of P element in the pure tin solder up to 35ppm, the static oxidation rate of pure tin decreased to 12.1g/m2 from 26.5g/m2, while the dynamic oxidation rate decreased from 8.9g/m2 to 5.6g/m2, which can significantly reduce the amounts of the oxidized slag from tinned tank during the continuous operating; By adding 0.1%Co, 0.05%Ni, the morphology of IMCs changed from scallop-shape to a uniform plate-shape, which can improve the interfacial bonding strength and flexibility; Adding 0.7%Cu can reduce the dissolution of the outer copper conductor during tin-plating process.

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