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5G brings challenges to mobile phone antenna design
Source:Original | Author:Calio Huang of C&T RF Antennas Inc | Publish time: 2019-10-13 | 625 Views | Share:


The surging 5G tide will bring important challenges to the RF front-end. We also talked a lot about the problems and countermeasures of power amplifiers and filters, but in fact, the antenna of the mobile phone, After the arrival of 5G, it will face an unprecedented test

 

Status of application of 5G frequency band in major regions of the world

  

First, we can look at the spectrum distribution of major cities and regions in the world under the Sub-6Ghz spectrum. For example, China is very focused on n78 and n79, EU is n78, and South Korea is also n78. The United States will initially focus on the millimeter wave, and the Sub-6G layout will be available later.

 

More troublesome is the Japanese frequency band. One of them is 3.6Ghz to 4.1Ghz n77 frequency band. This is different from other homes. If your mobile phone needs to cover this frequency, the antenna design will not be easy.

 

We further analyze that the spectrum comparison in Korea is determined. Between 3.4Ghz and 3.7Ghz, operators are basically implemented in LG, KT, and SKT. The United States focuses on the part of band 48. When it comes to China, China Telecom and China Unicom mainly focus on the 3.4Ghz to 3.6Ghz frequency band, while China Mobile focuses on the 4.8Ghz to 4.9Ghz frequency band. China Mobile also has Another frequency band - n41.

 

In particular, on the Japanese side, their n77 is a little different from other countries, and operators including NTT, KDDI, RAKU, SB and KDDI are also focusing on the 3.6Ghz to 4.1Ghz frequency band. In addition, NTT also has an n79 frequency band (4.5Ghz to 4.6Ghz), so if you want to support both Chinese and Japanese frequency bands on one device, and some operators in Japan require that by the end of the year, all devices must be simultaneously Supports n77 and n79 bands. Then this will mean a very big challenge for the antenna.

 

The previous talk about the sub-6G frequency band, let's take a look at the b41 frequency band.