1 thought on “Communication-Microwave Communication”
Brendan
Microwave communication is one of the modern communication methods. It is mainly used to solve the problem of transmission of large -capacity information such as multi -way telephone and television between cities, regions and departments. What is a microwave? Usually, we are called radio electromagnetic waves with a wavelength from 1000 meters to 100,000 meters. It is mainly used for special communication between ships; Communication; The wavelength of 1 meter to 10 meters is called ultra -short wave, which is mainly used for sound and TV broadcast; and the microwave we call, the wavelength is only L mm to 1 meter. At present, the wavelength used in microwave communication is 5 to 20 cm of radio electromagnetic waves. The reason why it is called microwave is not only because its wavelength is short, but also because its wavelength is smaller than the size of many objects on the earth. Microwaves and light waves have many similar characteristics. It cannot be spread by the earth like a long wave, because the earth has a great effect on it; it can not be spread by the sky wave like a short wave, because at this time the microwave will be worn hardly without labor without labor. The transparent leaving the layer and ran to the space of the universe and gone forever. Therefore, microwaves can only be spread straight like light, so that many objects on the earth will become its obstacles. Because the microwave is almost not much of the shooting capacity, even the arc of the earth can hinder its straight spread. In order to make microwaves more, the usual method is to set the antenna higher. Even so, due to the influence of the surface of the earth, a 40 -meter -high antenna can only ensure that the microwave at 50 kilometers (ie, the launch antenna launch antenna The path between the receiving antenna is completely unobstructed). In order to achieve long -distance communication, a relay station is set every 50 kilometers, the signal sent by the first stop is enlarged, and then transmitted to the next stop. For this time, reposting one stop, and finally reached the destination, just like the relay race in sports competitions. Therefore, microwave communication is sometimes called microwave relay or microwave relay communication.
The microwave communication has many advantages: its transmission capacity is very large, which can transmit tens of thousands of telephones or several TV programs at the same time, but the power required is small. Because the microwave is basically not affected by the day and night seasons, the signal transmitted is relatively stable. In addition, the direction of the microwave is very good, so its confidentiality is better than the general radio short wave communication. At present, microwave communication is widely used to transmit domestic telegraphs, telephones, faxes, and television services. It is also done by using this line. [-(@_@)-]
Although microwave communication is a better way of communication, the actual application is not very ideal, the main reason is that More strict. Because there is a relay station every 50 kilometers on the communication line, as the communication distance increases, the number of required relay stations also increases, and many microwave relay stations are inevitably located in the mountains, which means that to the relay station to the relay station The maintenance and management of various communication devices will cost a lot of manpower and material resources. In addition, the biggest problem of microwave relay communication is that the intercontinental communication cannot be completed. In the turbulent ocean, to establish so many relay stations, it is obviously that it is technically or economically. And how to use microwave for long -distance communication in real life, people naturally think of the "Ocean Ocean Benefit" -Co communication satellite.
Microwave communication is one of the modern communication methods. It is mainly used to solve the problem of transmission of large -capacity information such as multi -way telephone and television between cities, regions and departments. What is a microwave? Usually, we are called radio electromagnetic waves with a wavelength from 1000 meters to 100,000 meters. It is mainly used for special communication between ships; Communication; The wavelength of 1 meter to 10 meters is called ultra -short wave, which is mainly used for sound and TV broadcast; and the microwave we call, the wavelength is only L mm to 1 meter. At present, the wavelength used in microwave communication is 5 to 20 cm of radio electromagnetic waves. The reason why it is called microwave is not only because its wavelength is short, but also because its wavelength is smaller than the size of many objects on the earth. Microwaves and light waves have many similar characteristics. It cannot be spread by the earth like a long wave, because the earth has a great effect on it; it can not be spread by the sky wave like a short wave, because at this time the microwave will be worn hardly without labor without labor. The transparent leaving the layer and ran to the space of the universe and gone forever. Therefore, microwaves can only be spread straight like light, so that many objects on the earth will become its obstacles. Because the microwave is almost not much of the shooting capacity, even the arc of the earth can hinder its straight spread. In order to make microwaves more, the usual method is to set the antenna higher. Even so, due to the influence of the surface of the earth, a 40 -meter -high antenna can only ensure that the microwave at 50 kilometers (ie, the launch antenna launch antenna The path between the receiving antenna is completely unobstructed). In order to achieve long -distance communication, a relay station is set every 50 kilometers, the signal sent by the first stop is enlarged, and then transmitted to the next stop. For this time, reposting one stop, and finally reached the destination, just like the relay race in sports competitions. Therefore, microwave communication is sometimes called microwave relay or microwave relay communication.
The microwave communication has many advantages: its transmission capacity is very large, which can transmit tens of thousands of telephones or several TV programs at the same time, but the power required is small. Because the microwave is basically not affected by the day and night seasons, the signal transmitted is relatively stable. In addition, the direction of the microwave is very good, so its confidentiality is better than the general radio short wave communication. At present, microwave communication is widely used to transmit domestic telegraphs, telephones, faxes, and television services. It is also done by using this line. [-(@_@)-]
Although microwave communication is a better way of communication, the actual application is not very ideal, the main reason is that More strict. Because there is a relay station every 50 kilometers on the communication line, as the communication distance increases, the number of required relay stations also increases, and many microwave relay stations are inevitably located in the mountains, which means that to the relay station to the relay station The maintenance and management of various communication devices will cost a lot of manpower and material resources. In addition, the biggest problem of microwave relay communication is that the intercontinental communication cannot be completed. In the turbulent ocean, to establish so many relay stations, it is obviously that it is technically or economically. And how to use microwave for long -distance communication in real life, people naturally think of the "Ocean Ocean Benefit" -Co communication satellite.