Categories

A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

Microwave Transmission – a type of wireless transmission

– A type of wireless communication is the microwave transmission.
– The technology concerning the transmission of the energy or the information through radio waves (microwaves to be particular) is called the microwave transmission.
– Microwaves are the waves whose wavelengths can be measured in few centimeters.
– The microwaves lie in the frequency range of 1 GHz to 30 GHz of the radio spectrum.
– The centimeter range corresponding to frequency range of the microwaves is from 1 cm to 30 cm.
– Microwave transmission find its major use in the field of unicast or point – to – point communication.
– This is because the antennas of convenient size can direct these waves in to thin beams because of their small wavelengths.
– Theses narrow beams then can be directed towards the antenna at the receiving end directly.
– With this some nearby microwave equipment can make use of the same frequencies without getting involved with the interference issues as it happens in the radio waves with lower frequencies.
– Microwave transmission has one more advantage to offer which is that the microwaves have very high capacity for carrying information because of their high frequency.
– The bandwidth of the microwaves is 30 times larger than those lying below it in the radio spectrum.

But with advantages there are disadvantages also.
– One disadvantage is that the microwave transmission is appropriate only for the LOS (line – of – sight) propagation.
– Thus, it is limited to a very short range of distance.
– It is not possible for the microwaves to go around the hills or trees as the frequencies lower than that can do.
– Therefore, the microwave transmission is used in the unicast communications on the earth’s surface.

Applications of Microwave Transmission
– For example, it is used in very deep space radio communication and satellite communication.
– Systems in sensors, radio astronomy, radio navigation systems and radars utilization the different parts of the microwaves.
– Terrestrial microwave radio broadcasting is another application of the microwave transmission.
– It relay links in communication networks.
– For example, it links BSC – MSC and BTS – BSC in case of the backbone carriers in the cellular networks.

Technology behind Microwave Transmission
– For directing the microwaves in to beams for unicast or radiolocation, the antenna used is a parabolic one.
– It consists of a parabolic reflector for achieving narrow beams.
– The reflector is kept larger than the radio wave’s wavelength.
– However, because of their shorter wavelength they allow dishes of reasonable size to be used for providing directional response both in the case of transmission and reception.
– One technology associated with the microwave transmission is the microwave radio delay.
– This technology is used for the transmission of the digital as well as the analog signals.
– These signals include computer data, telephone calls and television programs.
– In this technology two directional antennas are used one at the transmitting location and the second one at the reception.
– A fixed radio connection is formed between the two locations.
– The maximum distance between the two locations must not exceed 40 miles.
– Since the high frequencies are used, between the two stations a quasi – optical LOS is required.
– Also, there has to be no obstacles in the path of the transmission between two stations.
– Any obstacle in the path can lead to the attenuation of the signal.
– This attenuation is tolerable only in few cases.

While planning the radio links some important issues to be considered include:
– Obstacles
– Curvature of the Earth
– Geography of that area
– Other reception issues.
Path profiles need to be produced for obtaining information about the Fresnel and the terrain that might affect the path of transmission. If there is a water body present in the path, it also has to be taken in to consideration since it can cause multipath distortion because of its reflective properties. A majority of the telephone traffic is carried by the microwave relay links.

Leave a Reply

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>