Chapter 2
related theory The current communication technologies has developed continuously, due to modern technology, communications technology, there is progress and there is growing fast. By such technology has introduced the theory of communication through microwave and radio frequencies to be used in the design in different parts of the system, wireless communications, wireless communication systems, can be applied to many different systems, such as. Wireless networking, or satellite communications systems, including systems that are mentioned in the microwave frequencies used in the frequency range between 300 MHz to 30 GHz
. In a wireless communication system Need to select the frequency with which must be implemented, which will require both the sector and the sector of wireless communication systems. This section is used to select the active frequency is. Doiwongchonkrong over the bar to allow the signal to the frequency with which a district-specific applications only. This is called the frequency band through wongchonkrong district, through which pass the bar district (Passband)
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