FR-4 Sheet Parameters and Conventional Thickness Introduction
A. FR-4 sheet parameters classification: dielectric constant parameters, dielectric loss parameters, TG value parameters
FR-4 board is made of epoxy resin + glass cloth pressed together into a double-sided copper-clad PCB board, generally used FR4 copper-clad board, relative to the air dielectric constant is 4.2-4.7, the dielectric constant will change with the temperature, in the temperature range of 0-70 degrees Celsius, the maximum range of change can reach 20%. A change in dielectric constant will result in a 10% change in line delay, the higher the temperature, the greater the delay. Dielectric constant will also change with the frequency of the signal, the higher the frequency the smaller the dielectric constant, the general design of the dielectric constant of the classic value of 4.4.
Dielectric constant (Dk,ε,Er) determines the speed of propagation of electrical signals in the medium. The speed of electrical signal propagation is inversely proportional to the square root of the dielectric constant. The lower the dielectric constant, the faster the signal travels. Let's make an analogy, as if you are running on the beach, the depth of the water submerged your ankles, the viscosity of the water is the dielectric constant, the more viscous the water, represents the dielectric constant is higher, you run more slowly.
The dielectric constant is not very easy to measure or define. It is related not only to the properties of the medium itself, but also to the test method, the frequency of the test, and the state of the material before and during the test. The dielectric constant also varies with temperature, and some special materials are developed with temperature in mind. Humidity is also an important factor affecting the dielectric constant, because the dielectric constant of water is 70, very little moisture, can cause significant changes.
FR4 sheet dielectric loss: insulating materials in the electric field, due to dielectric conductivity and dielectric polarization of the hysteresis effect, the energy loss caused by its internal. Also called dielectric loss, referred to as dielectric loss. Under the action of an alternating electric field, the residual angle δ of the angle between the current phase and voltage phase flowing in the dielectric (power factor angle Φ) is called the dielectric loss angle.FR4 sheet dielectric loss is generally 0.02, and the dielectric loss will increase with the increase of frequency.
FR4 sheet TG value: also known as the glass transition temperature, generally 130 ℃, 140 ℃, 150 ℃, 170 ℃.
B. FR4 sheet conventional thickness
Commonly used thickness: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, plate thickness error according to the plate factory's production capacity.
FR4 copper laminates commonly used copper thickness: 0.5 ounces, 1 ounce, 2 ounces, other copper thickness is also available, you can consult us if you have any questions.
Shenzhen Xinchenger Electronics Co., Ltd. is a professional 2-20 layers of high-frequency PCB circuit board manufacturers, can be expedited production of high-frequency PCB boards, mixed pressure high-frequency boards, special circuit boards, microwave RF boards, microwave antenna boards and other products, the company is always on hand: Rogers, Taconic, F4B, TP-2, FR-4 high frequency boards, expedited sampling 24 hours! We can do expedited sampling 24 hours every day.
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