Department of Energy and Power Engineering
http://hdl.handle.net/123456789/961
2024-03-29T05:27:53ZDevelopment of a remote sensing methodology for analyzing shifting cultivation and grazing patterns in the semi-arid region of Kenya.
http://hdl.handle.net/123456789/1111
Development of a remote sensing methodology for analyzing shifting cultivation and grazing patterns in the semi-arid region of Kenya.
Wayumba, GO
1983-01-01T00:00:00ZParameter optimization in design of a rectangular microstrip patch antenna using adaptive neuro-fuzzy inference system technique
http://hdl.handle.net/123456789/1110
Parameter optimization in design of a rectangular microstrip patch antenna using adaptive neuro-fuzzy inference system technique
Rop, K.V; Konditi, D.B.O; Ouma, H.A; Musyoki, S.M
Modern wireless system
s are placing greater
emphasis on antenna designs for future development in
communication technology becau
se the antenna is a key
element in the overall communication system. A
Microstrip Antenna is well suited for wireless
communication due to its light weight, low volume and
low profile planar configuration which can be easily
conformed to the host surface. In this paper, an
optimization method based on adaptive neuro-fuzzy
inference system (ANFIS) for determining the parameters
used in the design of a rectangular microstrip patch
antenna is presented. The ANFIS has the advantages of
expert knowledge of fuzzy inference system (FIS) and the
learning capability of artificia
l neural network (ANN). By
calculating and optimizing the patch dimensions and the
feed point of a rectangular microstrip antenna, this paper
shows that ANFIS produces good results that are in
agreement with Ansoft HFSS 13.0 simulation results.
2012-01-01T00:00:00ZTraffic Analysis in the Reduction of Power Consumption in Cellular Radio Access Network
http://hdl.handle.net/123456789/1109
Traffic Analysis in the Reduction of Power Consumption in Cellular Radio Access Network
Kimanthi, Shadrack; Kibet, P. L; Musyoki, S
All over the world cellular network communication has become an integral part of people’s lives. This has changed how people behave and their demand for connectivity is anywhere and anytime. Understanding the subscriber calling patterns and behaviour is very important when planning for the network resources and carrying out network design. Traffic analysis is carried and is aimed at improving Quality of Service, determining the busy hour, estimating subscriber traffic usage, determining the amount of capacity (channel) required to satisfy a given number of subscribers in a cell or network among other reasons. This paper investigates the telecommunication traffic of a selected region. An analysis of the subscriber calling pattern will be carried out and a solution will be proposed on how to reduce power consumption in the cellular
network based on traffic load.
2015-01-01T00:00:00ZImproving the Bandwidth of a Circular Microstrip Patch Antenna through Shape Modification
http://hdl.handle.net/123456789/1108
Improving the Bandwidth of a Circular Microstrip Patch Antenna through Shape Modification
Langat, Benard Kipkorir; Langat, Kibet P; Musyoki, Stephen
An antenna is used in a communication system to radiate or receive radio waves. The most desired antenna is one which is small in size, light in weight, cheap and can easily fit to the surface attached. All these features are inherently possessed by microstrip patch antennas. However, no antenna is perfect. Microstrip patch antennas like all other types of antennas do have their associated disadvantages. One of the major disadvantages of this type of antenna is narrow bandwidth. In this study, the narrow bandwidth of a circular microstrip patch antenna was improved through shape modification. The bandwidth of the antenna was optimized by adding some parts to and removing some parts from the initial circular patch. Although the main aim was to improve the bandwidth, it had to be ensured that other important parameters of the antenna such as radiation efficiency, impedance matching and gain are not degraded in the process. Microstrip line feeding technique was utilized in the design. HFSS 13.0 full wave simulator based on Finite Element Method (FEM) was used to simulate the antenna. Simulation results were then presented. Simulation results of return loss showed that the antenna achieved a bandwidth of 13.16% at 1.755 GHz and a very broad bandwidth from 3.315-20 GHz. This is a great improvement when compared with the bandwidth of a conventional microstrip patch antenna of less than 3%. Simulation results of Z11 parameters showed that the antenna achieved satisfactory impedance matching with a 50Ω transmission line at 1.755 GHz, 3.65 GHz, 4.668 GHz and 7.031 GHz and with a 75Ω transmission line at 9.366 GHz, 14.634 GHz, 16.461 GHz, 17.304 GHz and 18.265 GHz. The antenna recorded satisfactory gains and excellent radiation efficiencies in all these frequencies. The antenna can be used for a wide range of applications because of its wider bandwidth.
2014-01-01T00:00:00Z