High quality light sources are the basis for green lighting when selecting lamps. High-quality light sources should have the following three characteristics.
First, there should be no ultraviolet light or infrared light in the spectral composition. Excessive exposure to ultraviolet light for a long time is not only easy to cause keratitis, but also causes damage to the lens, retina, choroid, and the like. Infrared rays are easily absorbed by water, and too much infrared light is absorbed in a large amount when the lens of the human eye is concentrated. Over time, the lens will be denatured, resulting in cataracts.
Second, the color temperature of light should be close to natural light. People live in natural light for a long time, and the human eye has strong adaptability to natural light and good visual effects.
Third, the light is no-frequency flash. The normal fluorescent lamp has a power supply frequency of 50 Hz, which means that the light is emitted 100 times per second when it emits light. It belongs to the low-frequency stroboscopic light, which causes the human eye's regulating organ to be in a state of tension regulation, resulting in visual fatigue. If the frequency of illumination increases to hundreds or more tens of thousands of Hertz---becoming a high frequency, the human eye will not have a stroboscopic feeling; but the true stroboscopic is a DC-powered or semiconductor solid-state light-emitting device (such as an LED light-emitting diode). The light emitted is called a no-strobe flash.
High-Frequency PCB Advanced Circuits Specification
A high-frequency PCB can meet your needs when incorporating a special signal requirement into your electronic components and products. It offers a frequency range of 500MHz - 2GHz, making it ideally suited for high-speed designs, as well as radio frequency (RF), microwave and mobile applications. These higher transmission frequencies can also provide the faster signal flow rates that are a necessity in today's increasingly complex electronic switches and other components.
Special materials are required to achieve the high frequency provided by this type of printed circuit board - any changes in the Er value of these materials can affect the impedance of the board. Many PCB designers turn to Rogers dielectric material for its lower dielectric loss, reduced signal loss, lower cost of circuit fabrication and better suitability for fast-turnaround prototyping applications.
Apart from choosing the appropriate PCB material and determining the correct the value of the Er, designers should take parameter such as conductor width and spacing, substrate constant into consideration. These parameters must be exactly specified and implemented with the highest level of process control.
We're a High-Frequency PCB Manufacturer That Takes the Time to Assess Your Needs
PCB Manufacture Capabilities
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Features |
Capabilities |
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Layers |
1-36 layers |
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Material |
FR-4, Aluminum, Copper, Polyimide, high frequency (Rogers, PTEE, PI, Teflon), etc. |
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PCB Type |
FR-4 Standard PCB, Aluminum PCB , Copper-based PCB, HDI PCB , Rigid-Flex PCB, Flex PCB, Thick Copper PCB and Rogers PCB, etc. |
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Board Thickness |
0.1mm-6.0mm |
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Copper Thickness |
1/2oz-6oz(18um-210um) |
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Biggest Board size |
600mm*1200mm |
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Min Tracing/Spacing |
0.075mm/0.075mm (3mil/3mil) |
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Min drilling Hole diameter |
0.15mm(6mil), 0.1mm(4mil)-laser drill |
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Solder Mask |
Green, Black, White, Red, Yellow, Blue and Purple, etc. |
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Silkscreen color |
White, Blue, Black, Red, Yellow |
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Surface finish |
HASL Lead free, Immersion Gold (ENIG), Immersion Tin, Immersion Silver, OSP, Carbon oil, etc. |
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Special Techniques |
Impedance Control, Gold Fingers, Blind/Buried vias, Peelable solder mask, Half holes, Via-in-Pad and Countersink hole, etc. |
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ZhongFeng Electronic Technology Co., Limited , http://www.dopcba.com