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Article
Statistical Modelling of 1-min Rain Rate Derived from 1-h Integration Time in Malaysia
Statistical analysis of 1 min rain rate used in estimation of rain attenuation is presented. In rainy condition, the electromagnetic signal tend to experience serious degradation in satellite communication sys...
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Article
Variation of slant path Ka/V-band rain attenuation over seven tropical locations in Nigeria using synthetic storm techniques
In this paper, rain characteristics and slant path rain attenuation at 30 and 40 GHz using synthetic storm techniques over seven tropical locations in Nigeria have been presented. The technique can be used to ...
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Article
Structural, morphological, electrical and electron transport studies in ZnO–rGO (wt% = 0.01, 0.05 and 0.1) based dye-sensitized solar cell
Zinc oxide–reduced graphene oxide (ZnO–rGO) thin films were fabricated on a fluorine-doped tin oxide glass substrate by a chemical bath deposition method. The thin films were immersed in the Eosin Y dye for 24...
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Chapter and Conference Paper
Design of Dual Band H-Shaped Antenna for DCS and WLAN Applications
This paper presents the performance of a dual-band H-shaped patch antenna for DCS and WLAN applications. The proposed antenna employs a microstrip feed line and a FR4 substrate on which an H-shaped slot is cut...
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Article
Effect of seasonal variation on tropospheric scintillation at Ku-band in equatorial climate
One-minute tropospheric scintillation data recorded in Philippines over 3 years have been collected for analysis using a Superbird C Satellite (144°E) at 12.2 GHz with an antenna elevation angle of 58.8°. The ...
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Article
Meteorological Characterization of Effective Earth Radius Factor (k-Factor) for Wireless Radio Link Over Akure, Nigeria
The propagation loss on a terrestrial line-of-sight wireless link is influenced by atmospheric and seasonal conditions. The reliability of the link is also affected by k-factor values which is usually taken as 4/...
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Chapter and Conference Paper
An Enhanced ITU-R 837-6 Rain Rate Prediction Model for Tropical Region
This paper presents an enhanced rain rate model based on ITU-R 837-6 rain rate prediction. The improved model is derived from well behaved cumulative distribution function of over 100 rainfall rate samples fro...
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Article
Modification of Karasawa tropospheric scintillation model for Malaysia climate
Tropospheric scintillation is the rapid fluctuation and degradation of satellite signals due to changes in refractive index of atmosphere. This phenomenon tends to affect signals more strongly at frequencies a...
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Article
Prediction of Signal Attenuation due to Rain Models at Tronoh, Malaysia
Attenuation due to rain plays an important part in satellite industries. These attenuation could be measured directly via satellite beacon at frequency 12.255 GHz (Ku-band). Therefore, measurements of 3 years ...
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Article
A new double L-shaped multiband patch antenna on a polymer resin material substrate
The design and prototy** of a new double L-shaped patch antenna on substrate of available low cost polymer resin composite material is presented. The designed microstrip line fed compact antenna consists of ...
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Article
Rain-induced attenuation for Ku-band satellite communications in the west coast of Peninsular Malaysia, Penang
Accurate rainfall rate is important for predicting rain attenuation over a satellite link. Raindrops are able to take in, spread out, and change the polarization of satellite signals that pass through the atmo...
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Article
Variations of foF2 prior to earthquakes
Earthquakes are a kind of rapid and huge energy release process of the Earth’s internal energy. The changes associated to this energy release affect the atmosphere and ionosphere around the earthquake zone. In...
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Article
Rain rate analysis and total rain accumulation in the North of Malayan Peninsula
Using the 1-min data for 13 years (1993–2005) of rainfall measurements in Penang in the northwestern part of the Malayan Peninsula, we estimate rain occurrence to be ~12% of the year. At the same location duri...
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Article
Analysis of Rain Attenuation Models for South East Asia Countries
This paper presents an analysis of experimental data compared with existing rain attenuation prediction models, namely, the Yamada, R&K, Crane, DAH and ITU models, which have been previously used in satellite ...
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Article
Satellite Beacon Experiment for Studying Atmospheric Dynamics
To estimate the circuit quality of radio communication systems and design transmission methods for them, the designers need to quantitatively establish the way in which radio waves are transmitted within the s...
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Article
The Study of Rain Specific Attenuation for the Prediction of Satellite Propagation in Malaysia
Specific attenuation is the fundamental quantity in the calculation of rain attenuation for terrestrial path and slant paths representing as rain attenuation per unit distance (dB/km). Specific attenuation is ...
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Article
Microwave and Millimeter Wave Characteristics and Attenuation of Clouds over some Malaysian Equatorial Stations
Based on radar range height indicator (RHI) measurements, cloud characteristics in relation to radiowave propagation over three locations in different geographical region in western Malaysia have been presente...
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Article
Cloud Attenuation in Millimeter Wave and Microwave Frequencies for Satellite Applications over Equatorial Climate
A propagation experiment has been carried out at Penang using the SUPERBIRD-C satellite beacon. Cloud occurrences were observed during different months and it is seen that the low cloud occurrences over Penang...
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Article
Effect of Atmospheric Parameters on Satellite Link
The rainfall path attenuation measured at Universiti Sains Malaysia (USM) for 4 years (January 02 to January 06) is presented. The data obtained are useful to investigate the impairment due to rainfall attenua...
