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With the development of science and technology, the application of 77GHz microwave radar in the market has gradually increased, such as car collision avoidance, UAV collision avoidance, security monitoring and so on. Due to its high frequency, short wavelength, and wide working frequency band, compared to 24GHz radar and similar products of other frequencies, it has the advantages of small product size, long detection range, high accuracy, and is relatively less affected by weather changes. It is precisely because of its short wavelength and enhanced attachment effect that more attention needs to be paid to the selection of PCB materials for radar antennas and microwave radio frequency parts.
Generally speaking, in the commercial and civilian fields, RO3003PTFE ceramic from ROGERS, a world-renowned microwave material manufacturer, is generally recommended as the PCB material for 77GHz radar, mainly because of its good dielectric constant stability, small insertion loss, and board material. Processability. Using 0.5 ounces of electrolytic copper foil and a dielectric thickness of 10 Mil, the equivalent dielectric constant of the 50 ohm microstrip line is 2.69, the dielectric loss is 0.11 dB/cm, the copper loss is 0.35 dB/cm, and the overall loss is It is 0.46dB/cm.
In some cases, such as the use of high-gain antennas, the size of the product will be relatively large, and developers will feel that this loss still cannot meet the requirements of system design. In this case, Rogers' RO3003PTFE ceramic is still recommended as the PCB material. However, "rolled copper" is recommended for the attached copper foil. Compared with electrolytic copper foil, it has better surface roughness and can better reduce copper loss. Taking 0.5 ounce copper foil as an example, compared with electrolytic copper, the surface roughness of rolled copper has been reduced from 1.8um (RMS) to 0.3um (RMS). The equivalent dielectric constant of the 50 ohm microstrip line is 2.65, the corresponding copper loss is reduced from 0.35dB/cm to 0.13dB/cm, and the overall loss is reduced from 0.46dB/cm to 0.24dB/cm.
The above is an introduction to the selection of PCB materials for 77GHz radar antennas. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.
