Tianjin University Breakthrough Creates Flexible RF Filtering Technology

Flexible electronics is an important development direction in the future electronics field. At present, scientists have developed some flexible materials with good electronic properties, such as an array of transistors that can be folded and stretched freely, flexible flexible screens, and various types of fabrics that can be programmed on clothes. Sensors and electronic skin. However, if a flexible electronic device wants to exert its enormous potential, it must also possess a “hard skill” that is, radio frequency communication capability. Only when this function is available, what everyone expects can be realized.

At present, Tianjin University's State Key Laboratory of Precision Measurement Technology and Instruments, Institute of Precision Instrument and Opto-Electronics, and the Scientific Research Team of the Nanchang Institute of Micro-Technology of Tianjin University have made breakthroughs in this direction. Related research results “Flexibility for Wireless RF Communication "Film Film Bulk Acoustic Wave Filters toward Radiofrequency Wireless Communication" was published in the international authoritative journal "SMALL" magazine on May 17th, and was selected as the cover article as the key recommendation.

The mobile phone is an electronic device for wireless communication technology. It can silently realize high-speed data transmission. In today's era of smart phones, not only can a large number of sensor signals be collected and the transmission of control signals and the flow of information between devices be exchanged, but it can also be applied to mass node data transmission of Internet of Things and big data. However, such a "powerful" mobile phone is still hard and inflexible, because it is still a research problem to allow a flexible electronic device to have a high-speed wireless communication capability.

The Tianda Scientific Research Team has pioneered flexible RF filtering technology and has successfully developed a flexible RF filter using an innovative process called FlexMEMS (Flexible Microelectromechanical System) that can be directly applied to wireless RF communication of flexible electronics. The research results were completed by doctoral student Jiang Yuan under the guidance of Professor Pang Weiwei and Zhang Menglun.

RF filters are indispensable core building blocks in wireless RF communication modules. The role of wireless RF communication module is to receive, transmit and fine processing (filtering, amplification, modulation and demodulation, digital-to-analog conversion, etc.) data and information. The RF filter can avoid mutual interference between RF electromagnetic signals from different sources and different purposes. It plays a role in screening specific target electromagnetic wave signals.

"We have developed some of the flexible radio frequency filter electrical performance indicators have reached the current level of commercial RF filter in smart phones." Jiang Yuan said.

The team's first FlexMEMS process technology enables the manufacture of micro-electromechanical devices with high-precision movable microstructures on ultra-thin plastic substrates, solving the problem of rough-surfaced, high-temperature-resistant polymer substrates, high-quality thin films, and high-precision movable micro Structural incompatibility issues in device design, manufacturing, and packaging.

In addition, this technology is not limited to manufacturing flexible RF filters. It can also be applied to the manufacture of a variety of flexible MEMS devices such as pressure gauges, accelerometers, gyroscopes, ultrasonic identification and imaging units, projection imaging units, microphones, etc. Flexible electronic devices have a stronger ability to perceive the external world (such as virtual reality) and even affect the external world (such as reality enhancement).

“Next, we plan to develop a flexible electronic system with complete wireless RF communication capabilities based on the existing flexible RF filtering technology. Not only is the handset 'flexible and extendable', it can be bent, allowing flexible electronic devices to have “communication”. (Wireless communication), "thinking" (referring to operations), "memory" (referring to storage) functions, and even "perceiving" (referring to sensing) and "transforming" (referring to display, imaging, etc.) capabilities of the world are just around the corner." Pang Wei thinks.

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