5G band is divided into sub-6GHz band and millimeter wave band. The sub-6GHz band is the focus of current development. In recent years, the policy level has been raised many times to promote the construction process of 5G network, operators frequently start the procurement of related equipment, and the construction scale of China's 5G Sub6GHz network has been officially accelerated, but the peak rate of single-user is still 100MB under 5G Sub6GHz network. in order to meet the expectation of 5G 8KPI, more bandwidth resources must be looked for in the direction of high-frequency, and the millimeter-wave application has come into being in wireless communication network. millimeter wave applications in wireless communication networks have emerged.

The benchmark of "10Gbps" transmission capacity mentioned by 5GeMBB requires high-performance millimeter-wave 5G network, and the development of China's 5G network will evolve to millimeter-wave, truly realizing the breakthrough of 5G performance. Millimeter-wave band with its ultra-high transmission rate, large capacity and very low latency will become the core direction of the next phase of 5G development.

Millimeter-wave communication technology development can be applied to the earliest military radar, in the 5G construction of the civilian enterprise demand continues to drive, Yole predicts that through the RF GaN market economic space design will grow from 380 million U.S. dollars in 2017 to 1.3 billion U.S. dollars in 2023what is a distinguishing feature of 5g mmwave.

With the development of 2/3/4G wireless communication networks, the band resources (below 6GHz) used worldwide are very scarce. Millimeter wave technology is one of the key technologies for 5 g communications, which enables ultra-high speed wireless spectrum by increasing the bandwidth for data transmission.

Millimeter wave is characterized by wide bandwidth and narrow beam, and has a broad application prospect in 5G network, broadband satellite communication, radar and other fields. Millimeter wave refers to electromagnetic waves with a wavelength of 1 to 10 mm, corresponding to a frequency of 26.5 to 300 GHz, of which the available bandwidth is as high as 135 GHz, which can provide ultra-large bandwidth resources for wireless communication networks. In addition, millimeter-wave beamwidth is extremely narrow, so it can distinguish small targets that are closer together or observe the details of the target more clearly, which can greatly improve the observation accuracy of the radar.

China's 5G millimeter wave testing is progressing well, and the IMT-2020 (5G) Promotion Group has divided the 5G millimeter wave test planning into the following three phases: 2019 focuses on verifying 5G millimeter wave key technologies and system characteristics; 2020 focuses on verifying the functionality, performance, and interoperability of the millimeter wave base stations and terminals, as well as the verification of the typical scenarios from 2020 to 2021.

The first phase of testing is proceeding ahead of schedule. As of the end of October 2019, three system manufacturers, Huawei, ZTE and Nokia Bell, have completed the testing work expected for this year by completing the main functions, design and field testing of the millimeter-wave key technologies, realizing the millimeter-wave key technologies, and conducting millimeter-wave RF tests. At the same time, Hayes and Qualcomm also conducted millimeter-wave key technology laboratory chip function test.

At present for millimeter wave industry chain has been initially developed and mature.

Millimeter-wave high frequency and wide bandwidth, the baseband chip, RF chip, antenna, mixer, phase shifter, power amplifier, low noise amplifier, RF switch and other devices put forward new requirements. Currently, most low-frequency RF front-end devices are composed of GaAs, CMOS and SIGE, while millimeter-wave RF front-end devices are composed of third-generation semiconductor materials and INPs.

Take power amplifier (PA) for example.qcm6490 Currently, gallium arsenide (GaAs) is the mainstream power amplifier in the low-frequency band, but in the millimeter-wave band, gallium nitride (GaN) and InP manufacturing process performance is better than gallium arsenide (GaAs). High integration, high efficiency, high linearity and microsystem integration of millimeter wave will be the development direction of millimeter wave modules and devices, 6-inch GaN device manufacturing process will become mainstream.

Millimeter wave has a large bandwidth spectrum information resources and beam high resolution, the application market prospects are very broad. In addition to phased array radar and other traditional military fields, millimeter wave in 5G, broadband satellites and vehicle-mounted radar and other civil construction areas have a huge application prospects. Millimeter-wave communication engineering technology is realized in a way that makes it possible to provide a new development level direction for future research work that can realize the touchable Internet, low time-delay virtual social reality problems and future enterprise applications such as 3D. With the acceleration of 5G construction, millimeter wave will meet the broad economic development student space.