200671035_EMN4B01_PRACTICAL2_ANTENNAS.docx - Department of Electrical and Electronic Engineering Science ELECTROMAGNETICS FIELD THEORY 4B01(EMN 4B01

200671035_EMN4B01_PRACTICAL2_ANTENNAS.docx - Department of...

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Departmen t of Electrical and Electronic Engineering Science ELECTROMAGNETICS FIELD THEORY 4B01 (EMN 4B01 PRACTICAL 2 ANTENNA INVESTIGATION Kanuma Emmanuel KAGIMBANGABO 200671035
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PRACTICAL 2 ANTENNA INVESTIGATION 1. Objective This practical consists of investigating the following types of microwave antennas: horn and parabolic antenna. The objective was to determine the power received versus distance; to show the gain pattern for Horn as well as parabolic antenna. 2. Theory[ CITATION www138 \l 1036 ] 2.1. Horn antenna The horn antenna is a type of antenna used to transmit, guide as well as to receive electromagnetic waves. It has a trumpet shape and serves as a wave guide to focus and direct the radio wave in the desired direction. Horn antennas are used for industrial application as feeders for larger antenna such as the parabolic antenna. Horn antennas have the following characteristics: directivity/ gain , Standing Wave R atio and bandwidth . . Horn antennas have the following advantage: they do not contain resonant elements such as capacitors and inductors for instance. This makes them have a low Standing Wave Ratio, a wide bandwidth and low loss of gain. Hence it can operate over a wide range of frequencies. 2.1.1. The gain equation for a horn antenna where A is the area of the aperture; λ is the wavelength ; e A = aperture efficiency , 2.2. Parabolic antenna[ CITATION www139 \l 1036 ] Figure 1: Horn antena
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The parabolic antenna is also used to transmit, direct and receive electromagnetic waves. It has a curved parabolic surface known as a parabolic reflector (seen in figure 1).
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