Electronics

How does the material affect the performance of the sensor? Pt 2

Proper materials are essential to achieve the desired sensor electrical performance, especially in many more demanding high performance applications. Part 1 We have shown the effect of various sensor materials on the performance of infrared (IR) optical sensors. Radio frequency (RF) sensors also provide some interesting examples of the impact of materials on sensor performance.

With the expansion of RF applications in 5G, radar systems, which are an integral part of Advanced Driver Assistance Systems (ADAS) for automotive and other high frequency systems, sensors, and system designers, require the following materials:

  • Balanced dielectric properties
  • Electromagnetic compatibility and / or protection from electromagnetic interference (EMI)
  • Excellent dimensional stability

These materials are important not only to meet performance requirements, but also to achieve regulatory compliance. For demanding automotive applications, RF sensors require excellent mechanical properties and resistance to commonly used automotive chemicals.

  • EMI shield to eliminate crosstalk
  • Radar absorption to reduce cavity resonance
  • Thermal conductivity for thermal management

SabicThe companies that supply resins for RF sensors offer different compounds to meet the performance goals of different parts of RF sensors. Figure 1 shows an example of the material requirements for four different sections.F

Figure 1. Material requirements for various radar sensor sections.

This design requires the faceplate or radome to be a radar-transparent material at 20-100 GHz. In addition to the company’s LNP ™ THERMOCOMP ™ compound, which has rigidity and low warpage chemical resistance, it offers radar-permeable, high-temperature resistance, weather resistance, and dimensional stability ULTEM ™ resin.

The central plate requires a radar absorber with a 20-100 GHz shield. In this section, you can use LNP ™ STAT-KON ™ compound for radar absorption, LNP ™ FARADEX ™ compound for EMI shielding, or LNP ™ KONDUIT ™ compound for thermal management.

For antennas, control chips, or printed circuit boards (PCBs), NORYL ™ SA resin provides low dielectric loss.

The back cover requires EMI shielding and mechanical strength. In this area, you can consider NP ™ FARADEX ™ compounds for EMI shielding, or LNP ™ THERMO COMP ™ compounds with chemical resistance, rigidity and low warping, or NORYL ™ resins with chemical resistance, low moisture and warping.

https://www.eeworldonline.com/how-do-materials-impact-a-sensors-performance-pt-2/ How does the material affect the performance of the sensor? Pt 2

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