Conference and Symposia Proceedings
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/12
2024-03-29T07:25:06ZPerformance Analysis of Short Range, Low Power Wireless Transceiver Antenna
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/16665
Performance Analysis of Short Range, Low Power Wireless Transceiver Antenna
Dilhari, J.M.V.; Ranasinghe, M.Y.B.; Renoson, L.; Batuwantudawa, T.K.; Chandrasena, R.P.S.
Smart wireless technique is one of the emerging technologies for intelligent home
automation. There are number of wireless communication modules which can be
used for the communication inside the house or office such as Bluetooth, ZigBee, ZWa
ve, Wi-Fi, Insteon, RFM69HW and etc. By comparing all these module's cost and
power consumption with high RF output power RFM69HW RF transceiver has
been selected to be used for the smart home wireless network. The problem is this
module is available in the market with no antenna. This research is about how to
select a suitable antenna for low power RFM69HW transceiver module with
enough receiving power level required for a smart home network. This paper
contains the process of designing a suitable antenna for RFM69HWRF transceiver
module for a better communication between two transceiver modules. Here
different factors were considered which affect the Received Signal Strength
Indicator (RSSI) value of the receiver by considering relevant equations and
experimental results. The aim of this research is to select a suitable antenna for
RFM69HW RF transceiver module.
2017-01-05T00:00:00ZInvestigating a Suitable Method for Prediction of Lightning
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/16664
Investigating a Suitable Method for Prediction of Lightning
Samarasinghe, K.P.B.; Maduwantha, W.C.; Fernando, W.I.N.R.; Ranaweera, P.S.
Lightning can be defined as a transient, high-current electric discharge in air whose
length is measured in kilometers. Modern world smart features are invading the
concepts of technology. Thus, domestic smart concept requires protection and
awareness of a suitable lightning detection system. Lightning is a natural
phenomenon which cannot be controlled by anyone. Due to that reason, low cost
accurate lightning prediction systems are necessity. In this research, a novel system
of Ughtning prediction for domestic usage is researched using three techniques
with the help of an Electric Field Mill (EFM), inductor and a VHF antenna. EFM
consists of a non-rotating slotted sensor plate and slotted rotor plateis which are
exposed to an electric field developed using a DC high voltage. In order to reduce
the loss caused by lightning, it is necessary to study a Ughtning prediction method.
Considering the electric field exerted during the abrupt weather, conditions c^n'be
found during Ughtning occurrences for conducting the experiments. ; 1 ’' H' r"
The three methods being proposed were tested in a high-voltage laboratory, wh£re
EFM's output current increased linearly with applied high-voltage and was tested
up to 52 kV. For the inductor coil; 4.3 mH coil's output fluctuated between 23-33 mV
while 9.5 mH coil's output fluctuated between 30-40 mV. The tests conducted for the
VHF antenna revealed that the E-field is fluctuating in the range of 3.4-3.7 mV,
which does not specify a significant dependency. The obvious choice was the EFM
for Ughtning prediction as other two techniques weren't giving promising
relationships with a changmg electric field.
2017-01-05T00:00:00ZCover Page
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/16663
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2004-08-11T00:00:00ZContact Pages
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/16662
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2004-08-11T00:00:00Z