According to the "2014 Non-conforming Product for Quality Supervision and Inspection of Portable General Lamps", the trademark is "IKEA", the specification model is "V1017 JANSJO 3W", the production date or batch number is "1352", and the production enterprise is "IKEA (China) Investment Co., Ltd.'s clip light/wall lamp failed to be listed on the quality black list due to the structure (clamping force). In the column of unqualified items, this product was also specifically marked as a serious quality problem. According to industry insiders, if the structure (clamping force) is unqualified, the lamp can be pulled down by its own weight or micro force, which may cause accidental injury during use. As one of the most popular international home brands, IKEA should strengthen its supervision of product quality and prevent more bad products from flowing into consumers' homes.
Microwave PCB
microwave PCB`s is a type of PCB designed to operate on signals in the megahertz to gigahertz frequency ranges (medium frequency to extremely high frequency). These frequency ranges are used for communication signals in everything from cellphones to military radars. The materials used to construct these PCB`s are advanced composites with very specific characteristics for dielectric constant (Er), loss tangent, and CTE (co-efficient of thermal expansion).
High frequency circuit materials with a low stable Er and loss tangent allow for high speed signals to travel through the PCB with less impedance than standard FR-4 PCB materials. These materials can be mixed in the same Stack-Up for optimal performance and economics.
The advantages of using materials with a low X, Y and Z CTE is a resulting PCB structure that will remain extremely stable in high temperature environments while operating at up to 40 GHz in analog applications. This allows for the effective placement of very fine pitch components including, in some cases, bare die-attach. Additionally, the low CTE materials will facilitate the alignment of multiple layers and the features they represent in a complex PCB Layout.
Features
.CTEr = +40/+50 ppm per °C (low); Tg (glass transition temperature) is 280°C
.ER = 3.38/3.48 at 10.0 GHz
.ER is constant to 40.0 GHz
.ED (electro-deposited) copper only
.Layer-to-layer thickness control = +/- 0.001
.Fabrication costs are typical to slightly increased
Microwave PCB
Microwave PCB,Microwave Frequency PCB,Bare Copper Microwave PCB,High Frequency PCB
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