The lights have become an important part of the car's beautiful appearance and function, but the most basic function of car lights - safety, is often overlooked when buying a car.
Before the early 1980s, the headlights of the car were all glass-sealed, with the lens and the mirror connected together, with a thermal radiation incandescent lamp placed in the middle. In the early 1980s, headlights with interchangeable light sources appeared. In the late 1980s, in order to ensure that the car was stable and safe on the expressway, the illumination of the headlights at 50 meters in front of the car was increased from 6 lux to 12 lux, and high-efficiency gas discharge lamps were introduced to replace the halogen tungsten incandescent lamps. .
There are many types of modern car lights. As car exterior lights, there are night lights, fog lights, curve lights for arc lighting and direction lights when turning; brake lights, direction lights, and front photos at the rear of the car. The taillights that ignite at the same time. Traceable reflective mirrors, reversing lights, and license plate lights are easy to find in the parking lot. Night lights are commonly known as "headlights." Reasonable use of the headlights should be made into a low beam when the car is going to be turned into a high beam in time to make it far away from the line of sight and make up for the unclear sight caused by the car. When passing through an intersection and overtaking, you should prompt to change the distance.
The safest taillights are corner three-color taillights, while providing rear and side safety information. Generally, the brake light is installed at the same or similar position as the tail light. Recently, the high-position brake light installed at the glass window and the like is far away from the tail light and has a higher position. Therefore, the driver's signal is easier for the rear vehicle when braking. It was found that the brake status display was more effective. Drivers should be familiar with the role of these lights and use them skillfully.
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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