Notes

RF Amplifiers, High Power Amplifiers, RF Power Amplifiers
High Power Amplifiers , we will discuss the factors that affect the accuracy (resolution) and speed of a body scanner from the perspective of rf segmentation, which mainly depend on the following key factors:

The frequency range determines the scanner's penetration characteristics and available bandwidth. In general, the higher the frequency, the greater the penetration (in some cases) and the greater the available bandwidth. The higher the bandwidth, the better the resolution, because each frequency channel can transmit more target-related data. Because of the shorter wavelength, higher frequency systems require smaller antennas. Therefore, the multi-channel system will use multiple small high-frequency antennas. However, due to the complexity of semiconductor design, packaging issues, and the lack of expertise in high-frequency design by integrators, it is very expensive or complex to build a body scanner design based on extremely high frequency(>60 GHz) for large-scale commercial applications. As a result, most current systems are typically designed to use frequencies between 10 and 40 GHz.


The number of channels determines that information about the target can be obtained from many different sources. Higher channel Numbers usually provide higher target resolution and better antenna spatial diversity. Increasing the number of channels requires copying the hardware content of each channel, which significantly increases the size and cost of the rf portion. Higher channel count also means multiple high-speed adcs are required for the system, which further increases the cost of the mixed signal domain.

The dynamic range of the signal chain determines the sensitivity of the body scanning system. The higher the dynamic range, the stronger the system's ability to detect small and hidden targets. In order to improve the dynamic range of the system, integrators usually choose devices with excellent linearity and low noise coefficient.


Dear Friends,

Thank you for giving our company full support in 2021. The Spring Festival is approaching, all the staff of Keylink Microwave & Keylink Wireless wish you good luck in the year of the Tiger!

In order to celebrate the traditional Spring Festival, our company is scheduled for a 14 days’ holiday which is from 27, Jan. 2022 to 9, Feb., 2022. We will be back to work on 10, Feb., 2022.

We are looking forward to your support in the coming new year and we hope we can have better cooperation and make brilliant business!

Keylink Microwave & Keylink Wireless

Recently, MIIT (Ministry of industry and information technology) approved 4.8-5.0GHz, 24.75-27.5, GHz and 37-42.5GHz band for our 5G technology research and development test. In addition to the middle and low frequency 4.8-5.0GHz, which MIIT approved before, the 8.25GHz millimeter wave is approved. Which means the millimeter will take part in 5G.

Why choose the 8.25GHz millimeter wave frequency between 24.75 to 27.5GHz and 37 to 42.5GHz?

Wang Zhiqin, the vice chairman of IMT-2020(5G) promote group, said in a public speech, the 20GHz-40GHz has priority for pre-commecial in high frequency communication, inthe meantime, 26GHz and 28GHz, 38GHz and 42GHz can use the same set of RF device, which can be more likely to achieve globe harmonization.

Recently, High Power Amplifiers of innovation, science and economic development (ISED) is preparing to use the 28 GHz band, the 37-40 GHz band, and the 64-71 GHz bandfor the 5G system. Coincidentally, the RSPG also believe that the frequency beyond 24GHz has potential value. Because 24.25GHz to 27 GHz has large bandwidth more than3GHz, so the 24.5GHz to 27.5GHz has priority in the early deployment of 5G. At the same time, South Korea and the United States have used the frequency beyond 28GHz inhigh frequency 5G development, and Japan will also take the 28 GHz as the main alternative frequency for launching 5G services.

It is worth mentioning that, in the WRC-19 1.13 issue, in the 11 candidate frequency of 5G from 24.25GHz-86GHz, 24.25GHz - 27.5GHz has become more unified international opinion and research the most concentrated frequency band because it's lower frequency and wilder band.




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