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remcom_extra [2019/12/24 13:14]
potapoff 		remcom_extra [2020/01/30 22:43]
potapoff
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 +**Providing Narrowband IoT Coverage with Low Earth Orbit Satellites**
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 +Kenneth M. O’Hara, Gregory J. Skidmore, MWJ 2019'​12
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 +This article describes the modeling of a SATCOM link, specifically the use case of using a satellite overlay to extend service continuity to IoT devices in a poorly covered rural area. Non-terrestrial wireless networks (e.g., satellite constellations or high altitude platforms) have unique advantages—wide area service coverage and long-term reliability — which make them important components in the heterogeneous 5G global system of networks. Non-terrestrial networks (NTN) will likely play a critical role providing service to locations not covered by terrestrial 5G networks, such as rural and remote areas, moving platforms and disaster-stricken zones. One use case for NTNs is providing service continuity for machine-to-machine (M2M) or IoT devices as they move out of 5G terrestrial network coverage.1 This is particularly important for M2M/IoT devices which provide critical communications (e.g., applications in eHealth or vital asset tracking).
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 +[[https://​vk.com/​doc528950839_535595097|Читать полностью]]
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 +FDTD Simulation: Optimizing an LTE Antenna'​s Matching Network
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 +A simple antenna for LTE band operation is added to the PC board of a smartphone in XFdtd and the matching circuit is tuned for operation in multiple frequency bands. The components in the matching network are chosen to maximize system efficiency. ​
 +Figure 1 shows the antenna being used, which is a simple strip fed off center. It can be thought of as two back-to-back inverted L antennas of different “top” lengths, though the operating modes are more complicated than that. Figure 2 shows system efficiency for this antenna when fed directly and demonstrates that matching is required to improve performance.
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 +[[https://​vk.com/​doc528950839_535839179|Читать полностью]]
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 [[https://​vk.com/​doc558553917_530325568|Читать полностью]] [[https://​vk.com/​doc558553917_530325568|Читать полностью]]
  
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 +**Time Domain Simulation of Electrostatic Discharge Testing**
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 +An electrostatic discharge (ESD) is the sudden flow of current between two electrically charged objects, caused by the break-down of the dielectrics separating them, i.e., dielectric breakdown. In the case of electronic devices, the resulting current flow and possible spark can permanently damage the device (see Figure 1). An often recited yet unsubstantiated quote is “…losses associated with ESD in the electronics industry are estimated at between half a billion and $5 billion annually.” In reality, estimating the exact cost of ESD loss is extremely difficult; nonetheless,​ ESD forces the development and testing of many hardware prototypes during design and manufacturing and contributes to a high number of warranty claims with loss of consumer confidence if a failure occurs in the hands of the consumer. Therefore, electronics manufacturers go to great lengths to properly shield sensitive components and design systems to reduce, dissipate and neutralize static charge.
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 +[[https://​vk.com/​doc528950839_535595084|Читать полностью]]
  
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