Future development trends of RF sensors for communication relays

　　① Miniaturization will continue. Due to the rapid development of communication equipment, the space of the board is shrinking, miniaturization is an inevitable trend faced by every manufacturer, but miniaturization is based on the premise of not damaging the performance. Communication relay RF sensor from the first generation (1970s) to the fourth generation size has been reduced from 20 10 10mm to 10.0 6.5 5.0mm, shrinking more than 6 times, communication relay RF sensor from the first generation to the fourth generation of miniaturization trend shown in Figure 3. At present, the smallest electromechanical relay RF sensor in the world with a size of only 1.5 1.0 0.6mm has been manufactured abroad using MEMS (micro-electromechanical system) technology.

　　② The environmental protection requirements of RF sensors for communication relays will continue to increase and be paid attention to. Freon and bromine flame retardants used in the design and manufacture of RF sensors for communication relays will be eliminated or phased down. Lead is more harmful to the environment, but it is still used in the parts between the immersion welding coil and the lead end, and measures are being taken abroad, which will be completely abandoned in the near future.

　　At the same time as the in-depth development of electromechanical relay RF sensors, the proportion of solid relay RF sensors in the communications market will increase. Electromechanical relay RF sensor and solid relay RF sensor will coexist for a long time, but in the long run, it is the solid relay RF sensor that is the development direction, but at least in the next 20 or 30 years, electromechanical relay RF sensor is impossible to be completely replaced.

　　In short, the vigorous development of the communication industry provides a broad market space for communication relay RF sensors and puts forward higher reliability and safety requirements for communication relay RF sensors. The international standard for RF sensors of the fourth generation of communication relays, IEC61811-55 (draft), has put forward more stringent requirements for surge withstand voltage, insulation withstand voltage and surge protection insulation spacing and isolation between input and output.

　　⑤ Magnetic system efficiency will be further optimized. On the one hand, permanent magnet materials will develop rapidly, and the properties of magnetic materials will be improved by adding ingredients. Hard and soft magnetic groups will be applied in combination to produce materials with high persistence and coercivity. On the other hand, some designs to reduce the size of relay RF sensors have not used permanent magnets, flat coil systems, and electrostatic drive methods.

　　More and more demanding. RF sensors in the design, manufacturing process, materials and other aspects have and will appear new development changes and new trends to adapt to the continuous requirements of communication equipment.

　　⑥ Low power consumption. From the second generation relay RF sensor to the fourth generation power consumption is reduced from 200mW to 100mW. Reduced by half. A new ultra-sensitive communication relay RF sensor developed by NEC has reduced power consumption to 50 mW while maintaining the same dimensions and improving performance.

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