Antenna gain measurement using image theory

Balasundram, Sandrawarman (2014) Antenna gain measurement using image theory. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This report presents the measurement result of a passive horn antenna gain by only using metallic reflector and vector network analyzer, according to image theory. This method is an alternative way to conventional methods such as the three antennas method and the two antennas method. The gain values are calculated using a simple formula using the distance between the antenna and reflector, operating frequency, S-parameter and speed of light. The antenna is directed towards an absorber and then directed towards the reflector to obtain the S11 parameter using the vector network analyzer. The experiments are performed in three locations which are in the shielding room, anechoic chamber and open space with distances of 0.5m, 1m, 2m, 3m and 4m. The results calculated are compared and analyzed with the manufacture’s data. The calculated data have the best similarities with the manufacturer data at distance of 0.5m for the anechoic chamber with correlation coefficient of 0.93 and at a distance of 1m for the shield room and open space with correlation coefficient of 0.79 and 0.77 but distort at distances of 2m, 3m and 4m at all of the three places. This proves that the single antenna method using image theory needs less space, time and cost to perform it. The method used can be improved by considering the uncertain elements such as losses, reflections sources, optimize far filed distance and reflector size required in calculating the gain.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
ID Code:5541
Deposited By:Normajihan Abd. Rahman
Deposited On:24 Jun 2014 16:44
Last Modified:24 Jun 2014 16:44

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