Science Journal of Physics
November 2012, Volume 2012, ISSN:2276-6367
© Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
Characteristics of (lambda/10) 4-element Square Shape Stack Array Antenna for Terrestrial TV
Author: 1E. P. Ogherowo, 2Alade Olusope Michael
1Department of Physics, University of Jos, P.M.B. 2084, Jos, Plateau State, Nigeria
2Department of Pure and Applied Physics, Ladoke Akintola, University of Technology,
P.M.B.4000, Ogbomoso, Oyo State, Nigeria.
Accepted 12 August 2012; Available Online 28 November 2012
In this paper, the design of (lambda/10) 4-Element Square Shape Stack Array Antenna is proposed for terrestrial television (TV) at 170 - 710MHz frequency band. Analytical equations were derived from the existing first principle electromagnetic models of a single loop antenna for the proposed antenna characteristics. MATLABR2007a was employed for the calculation of the proposed antenna characteristics. The results show that the gain of the antenna is between 7dBi and 16dBi as against the chosen design gain of 12dBi within the frequency band of consideration. Also, the antenna voltage standing wave ratio is between 1.1 and 2.4 within the frequency band of consideration. The antenna has demonstrated omnidirectional field patterns with -3dB beamwidth of 120o±5o. However, more than 89% of the incident power would be absorbed by the proposed antenna at the frequency range of 203.25 - 710MHz as illustrated by the results of the reflection coefficient and the return loss of the antenna, and in agreement with the earlier work by other authors. Therefore, this study has shown that the proposed antenna demonstrates high performance at the bandwidth of 203.25 - 710MHz for the terrestrial television network applications, (impedance bandwidth of ∼4:1 is achieved).
Keyword:Square Shape Stack Array, Antenna characteristics, Terrestrial telivision networks, Electromagnetic models, Numerical calculation.