Let's improve the flying of Wi-Fi radio waves as much as possible

　By the way, at the beginning of the masterpiece, let's focus on improving the radio wave status of Wi-Fi and proceed with the commentary for a while.Until now, we had given priority to connecting anyway, so we put it next to it.This time, I would like to briefly explain in the study mode, so that radio waves can be known a little.

List of articles series "I don't know" of home Wi-Fi!

　Studying is not a big deal.If you know when using Wi-Fi, you will know the characteristics that will help you solve trouble as a premise.Wi-Fi is effective to know its properties as long as it uses invisible things called radio waves.

　You know when you start using Wi-Fi, but the radio waves do not fly as much as you think.However, if you know the characteristics of radio waves without flying, you can improve the flying of radio waves by devising the location of the Wi-Fi router.

　First, "IEEE 802, which is currently used mainstream.Let's know that the 11ac standard uses a very high frequency of the 5GHz band.How expensive is in a sense similar to the characteristics of light.IEEE 802, which was the mainstream before that.11n is 5GHz band and 2.It supports both the 4GHz band and uses a lower frequency.

" * 1" ... 2.The 4GHz band is a very ultra -short wave (UHF), but the 5GHz band is in the category of microwave (SHF), the characteristics of the frequency are different, and in terms of wavelengths, it vibrates shorter.By the way, it is millimeter waves above the 30GHz band, which is used for radar.

　Originally, radio waves go straight without obstacles and attenuate according to the distance.It reflects when it hits a metal, but it has the property of being transmitted to wood, paper, glass, etc., and the radio wave reaches the other side of the obstacle.

　It is due to these properties of radio waves that FM broadcasting can be received somehow in the room in a portable radio.However, the radio uses a frequency that is much lower than Wi-Fi and is less likely to be affected by obstacles.As the frequency increases, the characteristics of light become closer, and the characteristics of straight and reflection of radio waves become stronger.

　Moreover, if the frequency is high, the shorter the distance, the stronger the characteristics will occur and the intense attenuation.In a low frequency, the opposite is the opposite, in other words, the attenuation is proportional to the two -way frequency.In other words, if the same output and antenna gain, the lower frequency is unstable with the low frequency, but the radio waves reach far away.

　The conclusion of the content so far is 2.The 4GHz band reaches far away, and the 5GHz band is susceptible to things, but it reaches a stable reach at a short distance.The radio waves in the 5GHz band do not fly so far as a characteristic in the first place.

　For example, if the distance to the Wi-Fi router is longer due to a reason, close your eyes on the speed 2..If you use 11n only in the 4GHz band, you may be able to connect somehow.Regardless of whether it is comfortable or not, if you give priority to connecting anyway, there is such a way.

　When I heard this, 2.The 4GHz band feels better, but this band has the drawback that it is crowded.2.It is not only Wi-Fi that uses the 4GHz band.It is susceptible to Bluetooth and microwave ovens used in wireless headphones.Even in small power data communication that does not require a license, 2.I often use the 4GHz band.Moreover, the bandwidth that can be used is narrow.Let's talk about this after the next time.

　In principle, the Wi-Fi router is installed without any obstacles around.The situation that is installed in the back of a metal rack shelf is something that does not fly the radio waves to the surroundings, and is not the best.

　Considering the characteristics that the glass is passed through metals, etc., if you put an aluminum blind if you put it by the window, it is difficult to leak out and the radio wave will be reflected inside the room.By using the nature of reflection, you can fly radio waves to a little bit far.

　In other words, it is good to put it on the wall because it reflects on the room, but if it is next to the glass window, it will be leaked outdoors and do not reflect on the indoor side.If possible, put a panel like a metal on the wall, it should be the most efficiently reflected.

　Also, if you want to pass the radio waves between the rooms, open the door so that the radio wave can easily pass through, keep the partition a thin curtain, or if the Wi-Fi is prioritized, reduce the wall as much as possible during renovation.Is valid [*2].

[*2] ... It is even more efficient to connect the room by wired LAN and place Wi-Fi access points in each room.I want to touch on the construction method that connects the room.