1. RF principle - introduction
Radio frequency, referred to as RF, is actually a radio frequency current. It is a high-frequency alternating-current electromagnetic wave that represents the electromagnetic frequency that can be radiated into space. The frequency range is between 300KHz and 300GHz. An alternating current that changes less than 1000 times per second is called a low-frequency current, and a frequency of more than 10,000 times is called a high-frequency current, and a radio frequency is such a high-frequency current. Radio frequency technology is widely used in the field of wireless communications, and cable television systems use radio frequency transmission.
2. Radio Frequency Principle - Architecture
In the whole RF communication, the following frequencies are mainly included: transmission frequency, reception frequency, intermediate frequency and baseband frequency. The baseband frequency is the frequency of the signal used to modulate the data. The true transmission frequency is much higher than the baseband frequency. The general spectrum range is 500MHz to 38GHz, and the data signal is transmitted at this high frequency. In general, the RF system has a very powerful function of transmitting modulated signals. Even in the presence of interfering signals and blocking signals [z2], the system can transmit at the highest quality and receive with the best sensitivity. Modulated signal.
3. Radio frequency principle
We refer to high-frequency electromagnetic waves with long-distance transmission capability as radio frequency. When a current flows through the conductor, a magnetic field is formed around the conductor. The alternating current passes through the conductor, and an alternating electromagnetic field is formed around the conductor, which is called electromagnetic wave. When the electromagnetic wave frequency is lower than 300khz, the electromagnetic wave will be absorbed by the surface and cannot form an effective transmission. However, when the electromagnetic wave frequency is higher than 300khz, the electromagnetic wave can propagate in the air and be reflected by the ionosphere at the outer edge of the atmosphere to form a long-distance transmission capability. .
Eye Makeup Products include products that are used around the eye to enhance the appearance of the eyes and to emphazise the beauty of the eyes. They include such products as eye-shadow, eye-liner, eye-brow products, and other products that can help to enhance and accent the eyes.
First of all, the more common one is Eye Shadow. Eye shadows are usually used around our eyes. Why apply eye shadows? It is to produce a shadow effect, which can make our eyes look more three-dimensional. Well, there are actually many kinds of eyeshadows, such as common eyeshadow powders, which are basically used by many people, and the new one is an eyeshadow called eyeshadow. But no matter what kind of eye shadow, we can carry it with you, and then the part of the eye shadow is actually a kind of cosmetics in the eye makeup that is easier to get started.
Next up is eyeliner. The use of eyeliner is to draw a thin line along the roots of our upper and lower eyelashes to make our eyes look more energetic. Then the eyeliner is actually classified. The more common ones are similar to solids like pencils, and there are powders. There are still some water-based eyeliners. This is a pencil eyeliner. Water-based eyeliners are easier to color, and the results are better. But we need to pay attention when we remove our makeup. Dedicated makeup remover. When using eyeliner, if you are not familiar with it, it is best to put eyeliner on the periphery of the root of the eyelashes first.
Then there is the mascara. What we have to deny is that mascara plays a very important role. Many people look at your eyes or see your makeup basically look at the eyes, and the things that make eyes bigger and more beautiful are eyelashes. Anointed. Nowadays, there are many types of mascara. There are solid and liquid ones. When applying mascara, we have to apply it evenly, and then remember to apply it twice to get more three-dimensional.
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