High-Frequency PCB: A High-Speed Circuit for Signal Transmission

Are you a technology that handles navigation signals or a wireless network? One of the most important features in these devices is the high frequency PCB. These circuits are also important in electronics as telephones because they are the ones responsible for transmitting data. We looked at these pcbs in detail below, including their high-frequency design, so read on to learn more.

 

What is a High Frequency PCB?

High-frequency printed circuit boards are electronic devices used to transmit high-frequency frequencies with a frequency range of between 500mhz to 2ghz.

 

Since the circuit board has a fast flow signal and a high signal sensor, manufacturers build them using high-frequency laminate materials. This ultimately lowers the dissociation factor and stabilizes the dielectric constant.

 

  •         They Make Up High Frequency pcbs
  •         Low and stable Dk (Dielectric Constant)
  •         Diki Df (Dissipation Factor)
  •         Extremely hot
  •         Impact endurance
  •         Chemical resistance
  •         Remove denial
  •         Deep water drowning
  •         Like heat transfer to copper foil
  •         Low dimensional stability
  •         Perfect board spacing

 

Advantages of High Frequency pcbs

  •         Reduced moisture content
  •         Excellent thermal management
  •         Impedance control
  •         Dimensional/mechanical stability
  •         Excellent signal performance and reduction of signal loss

 

High Frequency pcbs Equipment

  •         Automotive, Airborne, and Ground-Based Radar Systems
  •         Global Positioning Satellite Antennas
  •         Cellular Telecommunications Systems
  •         Direct Broadcast Satellites
  •         Missile Guidance Systems
  •         RFID Tags (Radio-Frequency Identification)
  •         Millimeter-Wave Applications
  •         Space Satellite Transceivers
  •         In-band Point-to-Point Microwave Links
  •         Personal or Healthcare Monitors
  •         Medical Scanners (MRI, Ultrasound, CT, etc.)
  •         Power Indicators and Control Devices
  •         Industry and measuring equipment
  •         Scientific instruments (photometers, microscopes, and control system)

 

Tools Used for High Frequency pcbs

The high frequency pcb supplier boards require special PCB material to produce a high-speed signal output. Some of these unique features include:

 

  •         FR4: It is inexpensive laminate material and easy to manufacture. As such, it has limited electrical performance, especially if the signature speed exceeds 1.6ghz.

 

  •         Rogers 4350B HF: Like the Fr4, this model has a low manufacturing cost, competitive price, and offers high-quality stability.

 

  •         ISOLA IS620 E-fiberglass: Although difficult to manufacture, this material provides excellent thermal insulation and electrical performance.

 

  •         Taconic RF-35 Ceramic: This is a low-density PTFE-filled ceramic with woven glass. They are moderate in design but have good peeling power, good electrical performance, and low power consumption.

 

  •         Taconic TLX: Includes PTFE fiberglass, High-Frequency PCB is a compact composite that has excellent mechanical, thermal, and electrical properties. As a result, it is difficult to design.

 

  •         Rogers RO3001: The bonding film has a low loss tangent and dielectric constant. It is also resistant to chemicals and extreme heat.
  •         Rogers RO3003: The RO3003 has PTFE glass material which offers low Dk loss and low cost.

 

  •         ARLON 85N: Pure polyamide resin with high heat resistance
  •         Different manufacturers offer different types of high-frequency applications, but in general, they can be:

 

FR-4

  •         Ceramic-filled PTFE
  •         PTFE and woven glass
  •         Ceramic-filled hydrocarbon
  •         PTFE contains micro-glass fiber
  •         Ceramic-filled hydrocarbon with woven glass
  •         Ceramic-filled PTFE with woven glass

 

Issues And Designing HF Boards

Unrestricted Power

 

Since there is a thick deposition of CAMTECH PCB hidden vias sealed in resin in the PCB, there is usually a low binding force between the reinforced prepreg sheet and the resin. As a result, some pages may experience delamination, especially after sales at extremely high temperatures. Manufacturers often use resin containing comparable Tg and CTE to substrate materials to prevent delamination. The goal is to make the two pieces fit together and grow at the same rate to ensure that they remain tied together even as the temperature changes.

 

Drilling

A high-frequency multilayer board requires a lot of pressure through the holes to remove good heat, but this is not easy during PCB manufacturing. High-Frequency PCB creates heat, and waste melted from this process can build up on the wall of the pit, resulting in a decrease in thermal conductivity, which in turn affects the high-frequency circuit. The solution is to use a resin cover instead of aluminum, which absorbs heat better during extraction. It also helps increase suction and vacuuming forcing to improve hole type.

 

Back-Drilling

While it through holes helps with heat dissipation, it can compromise the integrity of the high-frequency signals. The extra stub seems to show, which increases the loss of placement. The only way to work around this problem is to drill a large hole in the cell to remove another stub.Thus, the issue comes from the burrs that remain after digging. Manufacturers can bypass them by drilling holes before inserting them.

 

Surface Complete Selection of High Frequency pcbs

The high finish gives the PCB extra strength and attractiveness. Usage options include:

 

HASL

HASL (Hot Air Solder Leveling) involves dipping the High-Frequency PCB into a molten solder bath, and then placing it in a hot air container. The air flow is a smoother and shiny coat while making it more uniform. It is the most widely used finishing method due to its low cost and high shelf life. Thus, the method increases the chances of solder bridging in good pitch pcbs, while the lead component makes it a health hazard.

 

ENIG

Like HASL, ENIG is an acronym, representing Electroless Nickel and Immersion Gold, and involves placing gold and nickel layers on high frequency PCB. The chemical electroplating method creates a coat with a long shelf life and is good for wrapping through holes. Also, it complies with rohs regulations, so it is safe to use. However, it is expensive and may increase the signal loss if not used properly Read More

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