HighfrequencyPCBs are developed from antennas, but the antennas are not the loops you see anymore - two antennas are embedded in the circuit board as etched copper structures.  So we can say that a high-frequency PCB is an antenna PCB that generates, evaluates, emits, and receives radio-frequency signals of more than 1GHz.

The Applications of High-Frequency PCBs

PCBmanufacturerChina talk High-frequency PCBs work in the way of Radars, and in fact, a high-frequency PCB is the core component in a radar application.   High-frequency PCBs have many applications in aerospace, defense, communication, automotive, and consumer electronics.   

These applications include:

·Radar scopes
·Transmitters
·Receivers
·Antennas
·Power amplifiers
·Low noise amplifiers
·Filters
·Mobile telecom products
·Automobile anti-collision system

Why are High frequency PCBs much more expensive than normal PCBs?

The secret behind the expensive high-frequency PCBs is the base materials. These high-frequency base materials take up the most proportion of the circuit board's price. The base materials for high-frequency PCBs are PTFE, ceramic, FR4, PI, ceramic-filled PTFE, ceramic filled with hydrocarbon, etc.

Low dielectric constant (DK).     

Small Dk means stable signals and little signal delay.

Low dielectric loss (Df).     

Small Df means the PCB has a small signal loss.

Low water absorption.     

Moisture elevates Dk and Df, so the materials should have low water absorption.

Small thermal expansion and contraction coefficient and good thermal resistance.     

Otherwise, the RF performance will be affected seriously.

Good chemical and impact resistance and peel strength.     

High-frequency PCBs are usually used in aggressive environments, so they should have these features.