High-Frequency PCB

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HIGH-FREQUENCY PCB

High frequency PCB is very suitable for applications involving special signal transmission between equipment. These PCB also involve using special materials to achieve high frequencies. Compared with traditional PCB, high-frequency PCB generates smaller high-frequency signal impedance.

When electronic equipment and products need special signal requirements, high-frequency PCB can be used. Its working environment is 500MHz – 2GHz. Therefore, they are ideal for high-end applications. Today, the complexity of electronic devices is increasing rapidly. Therefore, we need high-frequency PCB to provide faster signal transmission.

We have rich test methods, such as AOI test, E-Test, X-RAY, impedance control, high temperature and high humidity, high and low temperature cycle and other advanced test technologies to ensure quality.

FR4, high TG FR4, high-frequency material, Rogers PCB, metal based PCB. Excellent one-to-one customer service (individual to individual).

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WHAT IS A HIGH FREQUENCY PCB?

Are you working on a wireless network or application that contains specific signal transmissions between objects? Then consider buying a high-frequency PCB. The frequency range of these PCBs is 500MHz to 2GHz. You can use them in different applications, such as high-speed design applications, microwaves, mobile phones, and so on.

This type of PCB has many signal sensitivities. Therefore, it has high-frequency laminates to help maintain heat transfer for the application. In addition, the type of HF board you choose will determine the overall performance of your signal. Any change in the dielectric constant of the material will affect the impedance of the circuit board.

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HIGH FREQUENCY CIRCUIT BOARD

Main features of high frequency circuit board
◈  Small and stable. In addition, there is no delay in signal transmission. Ideal for signal transmission. And effectively reduce signal waste. The copper free foil separates with temperature change.

◈  HF board with low water absorption.
Impressive properties such as impact resistance, heat resistance, peel resistance and chemical resistance. In addition, the high peel resistance improves the signal quality of PCB.

Materials required for high frequency circuit boards
◈  Because high-frequency PCB layouts work at high frequencies, they often suffer from extremely high temperatures.
◈  If the material is unsuitable, it may lead to thermal stress accumulation. Therefore, we need to choose a material with a good coefficient of thermal expansion (CTE). In addition, the material shall have high dimensional stability. This way it will not be degraded at runtime.

◈  We usually use these materials for advanced applications. Therefore, the materials we use for manufacturing should have excellent thermal conductivity and electrical conductivity.

◈  We often deploy high-frequency PCB in extreme environments. Therefore, they should have high corrosion resistance and moisture resistance. Therefore, the materials we use to make high-frequency PCB should be moisture-proof. High frequency signals are very sensitive to noise. Therefore, we need to use materials with stricter impedance tolerance to manufacture these PCBs.

THE FOLLOWING TABLE EXPLAINS THE PROPERTIES OF EACH MATERIAL:

Some of the materials we use are Taconic TLX, Rogers, ISOLA IS620 E-glass fiber, etc.

HIGH FREQUENCY PCB IS USED IN ALMOST EVERY INDUSTRY

High frequency PCB is used in almost every industry. We also interact with them in our daily life. You can see high-frequency PCB in ATM machines, vending machines, computers in banks, mobile phones for browsing the Internet, and Wi Fi routers in homes or offices.

Some important industrial fields relying on high-frequency PCB include:
◈  Network communication, especially network communication involving signal integrity verification.
◈  Manufacture of small equipment involving small circuit layout.
◈  Design modules for devices that require excellent impedance control.
◈  Installed electronic devices for consumers, such as digital counters at airports. We use high-frequency PCB in it, because these machines need advanced control, they can process large amounts of data and interact with customers in a short time interval. Design and manufacture high-speed digital test boards for various signals. Therefore, this includes the test of RF signal roll off. Manufacturing highly intensive medical equipment can run at high speed, but at low cost.
◈  Automobile radar system.
◈  Millimeter wave applications.
◈  Global positioning satellite antenna.

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With high-frequency PCB, you can get many benefits, such as:

WHY SHOULD YOU CONSIDER HIGH-FREQUENCY CIRCUIT BOARDS:

◈ Reduce moisture content
When moisture is involved, a small amount will distort the electrical performance of the high-frequency board. Interestingly, compared with traditional FR-4, the humidity level of PTFE and other materials is as low as 2%. The rating of FR-4 is very high, about 50%. As a result, the reduced moisture content translates into significant electrical performance.
◈ Excellent thermal management
Most of the time, high-frequency PCB will generate a lot of heat during operation. Therefore, with polyimide and other materials, you can rest assured that you will obtain strong thermal performance. In addition, you can use them in harsh environments.
◈  It has a controlled impedance
The board contains materials that maintain a Dk tolerance of+/- 2% or more. This means it is very useful for circuits that require strict impedance control.
Most of the time, high
◈  Comprehensive and excellent signal performance
Because of its PTFE material, the dissipation factor is low. This also means that it reduces signal loss.
◈  It has dimensional stability
High frequency PCB has thermosetting hydrocarbon material. These materials promote mechanical stability.
◈  High frequency PCB design and layout

MAIN CAPABILITIES

Fewer vias in connection

Make sure there are fewer vias in the connection, because when you use vias, they produce a 5 x 10-13F distributed capacitance. Therefore, reducing the via will lead to a sharp increase in speed. In addition, it reduces the chance of data errors.

Make high-frequency lead longer

In this step, the science is that the routing length of the signal line is proportional to the radiation intensity. With this in mind, this means that when the high-frequency lead is long, you will find that its components are easily coupled.

Reduce bending

Convective heat is dissipated by transferring heat to water or air. Therefore, it allows Reduce the bending between the pins on the high-frequency board. In most cases, it is better to use a complete straight line when wiring HF boards. If you must break, use an arc break or a 45 degree polyline. Therefore, you will improve the bonding strength of copper foil in low-frequency circuits. However, this step is not necessary for high frequency circuits. This is because it reduces external emissions.

Reduce crosstalk

Convective heat is dissipated by transferring heat to water or air. Therefore, it allows Do not take signal line crosstalk for granted. Crosstalk occurs between signal lines lacking direct connection. Therefore, it is better to reduce crosstalk in high-frequency signals.

Try to avoid circulation

Convective heat is dissipated by transferring heat to water or air. Therefore, it allows Try not to have loops when wiring HF boards. If they happen, make them very small.

ABOUT ASH LIGHT

CHALLENGES AND SOLUTIONS OF ALUMINUM SUBSTRATE

Surface treatment of high-frequency copper foil
As the frequency increases, the signal flows through the orbit. The track generates current. The current then pushes the current density toward the outer surface, not toward the center of the track. Therefore, during the production process, you may encounter an increase in copper surface roughness. As a result, there will be a lot of signal loss at high frequencies.
Resistance welding layer under high frequency
The solder mask has a high dissipation factor. Therefore, when you apply it to high-frequency traces, it increases the dielectric loss of the circuit.
How to produce controllable impedance transmission line?
Controlled impedance is created to avoid signal loss. There are two simple ways to achieve this:
◈ Microstrip Method
This method is related to tracing at the top level. The routing usually has a ground plane below it.
The calculation involved in this method is quite complex. In addition, it depends on different factors, such as the height above the plane, the relative dielectric constant, the line width, etc. Therefore, your best choice is to ensure that your ground plane is very close to the top layer
◈ Stripline Method
The stripline method is similar to the microstrip line, the only difference is that the stripline has an additional group plane. The group plane is above the trace. When using this method, be sure to place the route between two planes. This method is a better choice. The reason is that there is EMI radiation in two planes.

CAMTECH PCB

The following rules of thumb will provide you with broad guidance. Therefore, you should remember:
"As long as the cable length becomes a large part of the fastest signal wavelength, you should seek high-frequency design." This means that large size PCBs need to be high-frequency designed at much lower frequencies. However, smaller PCBs require high-frequency design at relatively high frequencies. The difference between the two is due to the difference in routing length.

Camtech PCB has rich experience in PCB production. Therefore, you can be sure that you will get excellent high-frequency PCB manufacturing services. Our circuit boards usually range from 500MHz to 2GHz.

This is a table to let you know:

OUR GENERAL MANUFACTURING CAPABILITY?

Plate thickness	0.4 – 5.0 mm	Materials	RO3010, RO4350B, RT5880, RO4003C, RO3003
Polypropylene	Domestic - (6700), Rogers 4450F, etc	Order quantity	No MOQ
Screen printing surface	It depends on the document.	Color of solder mask	Blue, red, yellow, green, white
Number of floors	2 – 40	Quality grade	Standard IPC 2
Alternative methods	Countersink, gold finger, peelable soldering tin, mask carbon oil	Plate size	0.4-5.0 mm
Silk screen color	black, yellow, white	Minimum drilling diameter	0.15 mm
Surface treatment	Tin deposition – RoHS, ENIG – RoHS, gold plating – RoHS, silver deposition – RoHS	Weight of finished copper	0.5 – 2.0 0z
Manufacturing time	This depends on the project (10 days to 5 weeks)	Minimum ring	0.1 mm
Minimum tracing	3mil/3mil	Impedance tolerance	± 10%

FAQ

Q
How to select high frequency pcb/High speed PCB materials?
For material selection, FR-4 material is a common laminated material. In addition to the alumina substrate, other substrate materials (such as PPO and Teflon) can also be used as frequency laminates. In addition, the material combination, dielectric material and carrier substrate of PCB substrate should also be considered.
Q
How to deal with the signal integrity problem in high-frequency signal transmission?
Signal integrity measures these signal distortions in the high frequency range. Signal trace, signal layer and signal energy may affect the effective transmission of signals. For more information about high-speed signals, please contact our team.
Q
What should be considered in high-frequency PCB design/high-frequency design?
First, consider the design rules of circuit design, such as PCB layout design and design process in electronic design. In addition, your high-frequency application determines the circuit performance you need. Such as characteristic impedance, mechanical strength, thermal characteristics (thermal expansion), chemical resistance, loss tangent and heat dissipation. Then, layer thickness, PCB components (key components) of electronic devices, digital circuits, conductive layers. In addition, antenna array, antenna efficiency and conductor loss are also important factors to be considered.

High-Frequency PCB

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