In every link of its generation, conversion, and transmission, the signal may be distorted due to the existence of environment and interference. The function of the filter can be summarized in four words: remove the false and save the truth, process the signal, and remove what we don’t need. The harmonics are processed, leaving the signal we need.
The Internet equipment we use must transmit cellular signals, Wi-Fi signals, Bluetooth signals, and GPS signals across multiple frequency bands, while avoiding interference. With the rapid increase of the operating frequency of electronic equipment, the frequency of electromagnetic interference is getting higher and higher, and the interference frequency usually reaches hundreds of megahertz, or even more than one gigahertz. Since the higher the frequency of the voltage or current, the easier it is to generate radiation. Therefore, it is these high-frequency interference signals that have caused the problem of radiation interference to become more and more serious. A basic requirement for filters used to solve radiation interference is to be able to These high-frequency interference signals have greater attenuation. This kind of filter is a radio frequency interference filter. The effective filtering frequency range of ordinary interference filters is from kilohertz to tens of megahertz, while the effective filtering frequency range of radio frequency interference filters is from Several thousand hertz to over one gigahertz.
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Analysis of the Status Quo and Prospects of the RF Filter Industry
There are four basic prototypes of RF filters, namely low-pass filters, high-pass filters, band-pass filters, and band-stop filters. Low-pass realizes that only low-frequency signals pass, and high-frequency signals are suppressed. The characteristics of high pass and low pass are opposite. High frequency is allowed to pass and low frequency is suppressed. Band pass and band stop are respectively allowed to pass or suppress the frequency signal in the required frequency band. In radio frequency communication, the filter is used as a basic component to ensure Signal purity means that it is not damaged by interference signals. It plays a unique and important role in many fields such as navigation, radio broadcasting, TV broadcast, mobile phone communications, satellite communications, and radar. As of 2019, the market share of high-frequency filters is 49.59%, ranking first; the market share of band-pass filters is 24.26%, ranking second. The rapid growth of mobile wireless data and 4G LTE networks has led to a growing demand for new frequency bands and combining frequency bands through carrier aggregation to accommodate wireless traffic. The 3G network uses only about five frequency bands, and the LTE network currently uses more than 40 frequency bands. With the advent of 5G, the number of frequency bands used will further increase. This directly increases the market demand for radio frequency filters.
In today's mobile environment, the number of frequency bands required for a device is amazing, and with the advent of the 5G era, this trend will only intensify. Although supporting all frequency bands will cause interference problems, the problem can be solved after the filter is adopted. Without the filter, the network cannot operate at all. There are many types of filter structures. In the future, microstrip and multi-layer structures should be the main ones. They are small in size, can withstand large power, and have low loss. This is the goal of the filter. In recent years, RF filters have followed the rapid development of modern wireless communication technology, and their market value has risen year after year, reaching US$4.095 billion in 2019. It is expected to continue to maintain a rapid upward trend for a longer period of time in the future.
In 1917, American and German scientists respectively invented the LC filter. The following year, the first multiplexing system in the United States appeared. Passive filters matured in the 1950s. Since the 1960s, due to the development of computer technology, integrated technology and material industry, the development of filters has reached a new level, and efforts have been made in the direction of low power consumption, high precision, small size, multi-function, stability, reliability and low price. Among them, small size, multi-function, high precision, stability and reliability have become the main direction of attack after the 1970s. Developed countries such as Europe and the United States have earlier developed and developed various filter products, and the technology is more mature; the widespread use of filters in China was in the late 1950s, and they were mainly used for voice channel filtering and report filtering at that time. . After half a century of development, Chinese filters have been included in the international development pace in terms of research, production and application. However, due to the lack of specialized research institutions, the integrated technology and materials industry cannot keep up. This has led to the development and application of many new filters in my country. There is a long way to go in international development; and the relatively backward regions such as Africa and the Middle East are not only lack of technology, but also relatively slow in development. As of 2019, the Asia-Pacific region has a market share of 37.88%, ranking first; North America has a market share of 30.67%, ranking second.
The Impact of COVID-19 on the RF Filter Industry
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