• September 22, 2022

What is the difference between Rogers PCB and ordinary PCB? Compared with ordinary PCB, Rogers is more suitable for making high-frequency PCB, and the board has better stability and higher precision. Rogers board has the following 4 series: RO4000 PCB board: Hydrocarbon-filled ceramic laminate with excellent cost performance. High-reliability TMM: rich dielectric constant, DK from 3.27-12.85, extremely low change with temperature, excellent mechanical properties, can resist creep flow and cold flow. High thermal conductivity 92ML: Epoxy resin + high thermal conductivity ceramic powder filled high thermal conductivity and high withstand voltage electronic material, UL MOT150 ℃, the absolute value of the same medium thickness withstand higher, 8mil> 4500VAC High-reliability RT / Duroid 5000/6000: PTFE filled ceramic or random glass fiber laminates with strict batch consistency and extremely stable electrical performance. Focus on high reliability and high stability applications. Rogers products are mainly used in: Mobile communication RF power amplifier circuit & antenna, microwave millimeter wave antenna, LNB for satellite broadcasting, microwave communication, millimeter-wave radar and optical communication, high-performance high-speed digital circuit multilayer PCB, high power and high thermal conductivity, automotive electronics, power supply, etc.

• September 16, 2022

What is a flexible PCB material? The Flex PCB board usually consists of the following five parts. 1.Insulating Substrate The insulating substrate is a flexible insulating film. As the insulating carrier of the circuit board, selecting a flexible dielectric film requires a comprehensive review of the material's heat resistance, shape-forming properties, thickness, mechanical properties, and electrical properties. Now flex PCB is commonly used PI: Polyimide, Kapton. PET: PolyeSTer, Mylar. PTFE: Polytetrafluoroethylene Generally, the thickness of the film is selected in the range of O.0127 to O.127 mm (0.5 to 5 mil). 2.Adhesive Sheet The function of the adhesive sheet is to bond the film and the metal foil, or the adhesive film and the film (the cover film). Different types of adhesive sheets can be used for different film substrates, such as polyester adhesive sheets and polyimide adhesive sheets. Polyimide substrate adhesive sheets are divided into epoxy and acrylic. The choice of bonding sheet mainly examines the fluidity of the material and its thermal expansion coefficient. There is also polyimide copper-clad sheets without adhesive sheets, which have better chemical resistance and electrical properties. Due to the low glass transition temperature of the acrylic adhesive sheet, a large amount of contamination generated during the drilling process is not easy to remove, which affects the quality of metalized holes and other unsatisfactory materials. Therefore, the interlayer adhesion of multilayer flexible circuits The common polyimide material of the sheet, because it is matched with the polyimide substrate, have the same CTE (coefficient of thermal expansion), which overcomes the problem of dimensional instability in multilayer flexible circuits, and other properties are satisfactory. 3.Copper Foil The copper foil is a conductive layer covered on an insulating base material, and a conductive circuit is formed after selective etching. Most of such copper foils are rolled copper foil (Rolled Copper Foil) or electrolytic copper foil (Electrodeposited Copper Foil). The ductility and bending resistance of rolled copper foil are better than that of electrolytic copper foil. According to coating online understanding, the elongation of rolled copper foil is 20% to 45%, and the elongation of electrolytic copper foil is 4% to 40%. The thickness of the copper foil is most commonly 35um (1oz), there are 18um (O.5oz) thin or 70um (2oz) thick, and even 105um (30z). Electrolytic copper foil is formed by electroplating. The crystal state of the copper particles is vertical needle shape, which is easy to form vertical line edges during etching, which is beneficial to the production of precision circuits. But when the bending radius is less than 5mm or the dynamic bending, the needle-like structure is prone to fracture. Therefore, most of the flexible circuit substrates are rolled copper foil, whose copper particles have a horizont...

• September 09, 2022

Holiday Notice Mid-Autumn Festival Dear customers: We will have Mid-Autumn Festival holiday from Sep.10-Sep.12, 2022. And we will resume normal work on Sep.13. During Holidays, should you have any enquiries, please feel free to email to infor@bichengpcb,com. Thank you. Best regards, Shenzhen Bicheng Electronics Technology Co., Ltd

• September 08, 2022

What about Teflon Radar apply in PCB? Rogers RO3003+Shengyi S1000-2 to produce 77GHz Millimeter wave radar PCB in batches. RO3003 high frequency PCB material Rogers RO3003 high-frequency PCB , ceramic-filled PTFE(Teflon) laminates are an extension of Rogers's 'industry leading RO3003 solutions. RO3003 laminates are based on industry feedback to specially address the next generation needs for mm-wave automotive radar applications. RO3003 laminate's combination of optimized resin and filler content provides a lower insertion loss, ideal for use in ADAS systems like adaptive cruise control, forward collision warning and active brake or lane change assist. Advantage 1: high range resolution and ranging accuracy Compared with the ISM band with only 200MHz bandwidth in 24GHz band, the SRR band in 77GHz band can provide up to 4GHz scanning bandwidth, significantly improving the range resolution and accuracy. Among them, range resolution represents the ability of radar sensor to separate two adjacent objects, and range accuracy represents the accuracy of measuring a single target. Because the range resolution and accuracy are inversely proportional to the scanning bandwidth, the performance of 77GHz radar sensor is better than that of 24GHz radar, which is 20 times higher than that of 24GHz radar. In fact, the range resolution of 77GHz radar is 4cm (the resolution of 24GHz radar is 75cm). High range resolution can better separate objects (such as people standing near cars) and provide dense points to detect objects, so as to improve the environment modeling and object classification, which is very important for the development of advanced driving assistance algorithm and automatic driving function. In addition, the higher the resolution, the smaller the minimum distance of sensor recognition. Therefore, 77-81ghz radar has a significant advantage in applications requiring high accuracy, such as parking aid. The 77GHz broadband has high resolution, which can be used for industrial level sensor, so that the sensor can "measure to the last drop" of liquid level - to minimize the dead zone at the bottom of the water tank, as shown in the figure. Moreover, because the high resolution can improve the minimum measurement distance, when the water tank is full, the sensor can measure the liquid level at the top of the water tank.

• August 31, 2022

Advantages, Disadvantages and Development Trends of FPC Flexible Circuit Boards FPC flexible circuit board is a highly reliable, excellent flexible circuit board made of flexible insulating substrates such as polyimide or polyester film. Sexual printed circuit board. It has the characteristics of high wiring density, light weight, thin thickness and good bendability. Flexible printed circuit boards are also divided into single-sided, double-sided and multi-layer boards. Flexible circuit boards are mainly used in the connection parts of electronic products. The advantage is that all lines are configured. It can improve the softness by eliminating the need for connecting workers of redundant cables. Strengthening the assembly of three-dimensional space in a limited space can effectively reduce the volume of the product. It increases the convenience of carrying and also reduces the weight of the final product. Features of flexible circuit boards: 1. Short assembly time: all lines are configured, eliminating the need to connect redundant cables. 2. Smaller in volume than PCB: It can effectively reduce the volume of the product and increase the convenience of carrying. 3. Lighter weight than rigid PCB: It can reduce the weight of the final product. 4. The thickness is thinner than the PCB: it can improve the softness and strengthen the assembly of three-dimensional space in a limited space. Advantages of flexible circuit boards: Flexible printed circuit boards are printed circuit boards made of flexible insulating substrates and have many advantages that rigid printed circuit boards do not have: 1. It can be bent, wound, and folded freely, and can be arbitrarily arranged according to the spatial layout requirements, and can be moved and stretched arbitrarily in three-dimensional space, so as to achieve the integration of component assembly and wire connection. 2. The use of FPC can greatly reduce the volume and weight of electronic products, which is suitable for the development of electronic products in the direction of high density, miniaturization and high reliability. Therefore, FPC has been widely used in aerospace, military, mobile communications, laptop computers, computer peripherals, PDA, digital cameras and other fields or products. 3. FPC also has the advantages of good heat dissipation and solderability, easy assembly and connection, and low comprehensive cost. The design of soft and hard combination also makes up for the slight deficiency of the flexible substrate in the component carrying capacity to a certain extent. Disadvantages of flexible circuit boards: 1. High one-time initial cost: Since flexible PCBs are designed and manufactured for special applications, the initial circuit design, wiring, and photographic plates require higher costs. Unless there is a special need to apply a flexible PCB, it is usually best not to use it in a small amount of applications. 2. It is difficult to change and repair the flexible PCB: once the flexi...

• August 18, 2022

What's the Key Materials for High-Frequency PCB Circuit Boards The circuit material of a printed circuit board (PCB) is a key building block for RF/microwave circuits - essentially the starting point for these circuits. PCB materials come in many different forms, and the choice of material depends largely on the requirements of the intended application. For example, materials that reliably support high-frequency circuits in commercial wireless products can fail rapidly when exposed to the extremes of a military environment. A basic understanding of PCB material types and their parameters can help match materials to applications. As with many RF/Microwave components, PCB materials are classified and compared by a number of key parameters, including relative permittivity (Dk or εr), dissipation factor (Df), coefficient of thermal expansion (CTE), dielectric thermal coefficient constant ( TCDk) and thermal conductivity. When classifying different PCB materials, many circuit designers start with Dk. The Dk value of a PCB material refers to the capacitance or energy available between a pair of very close conductors fabricated on the material compared to the same pair of conductors in a vacuum. A vacuum creates a reference of 1.0, other dielectric materials provide higher references. For example, commercial PCB materials typically have Dk values in the range of about 2 to 10, depending on how they are measured and how often they are tested. Conductors on materials with higher Dk values can store more energy than conductors on materials with lower Dk values. Printed Circuit Board (PCB) The Dk value of a PCB material affects the size, wavelength, and characteristic impedance of transmission lines fabricated on that material. For example, for a given characteristic impedance and wavelength, the dimensions of a transmission line fabricated on a PCB material with a high Dk value will be much smaller than a transmission line fabricated on a PCB material with a lower Dk value, although other material parameters may vary . Designers facing circuits where loss is a critical performance parameter often prefer to use PCB materials with lower Dk values because these materials have lower losses than materials with higher Dk values. In practice, PCB materials can lose signal power in four ways: dielectric loss, conductor loss, leakage loss, and radiation loss, although both dielectric and conductor losses can be better controlled through the choice of PCB material. For example, the Df parameter provides a way to compare the dielectric loss of different materials, where a lower Df value indicates a material with lower dielectric loss. For a given transmission line impedance (e.g. 50Ω), the transmission line on the low Dk material will be physically wider than the transmission line on the high Dk material, and the conductor loss of the wider transmission line will be smaller. These wider transmission lines also translate into higher manufacturing yields (and savings i...