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While using the cloud storage services on resource constraint mobile device, the mobile user needs to ensure the confidentiality of the critical data before uploading on the cloud storage. The resource limitation of mobile devices restricts mobile users for executing complex security operations using computational power of mobile devices. To make security schemes suitable for mobile devices, large...
Past studies have established that in the S-band range of 2GHz, rain attenuation is negligible. However, every year, heavier rain intensities are being experienced in tropical countries like Malaysia due to current global warming conditions. The study presented in this paper aims to quantify the rain attenuation that is suffered by Worldwide Interoperability for Microwave Access (WiMAX) signals in...
In this paper, a novel miniaturized capacitive loaded electromagnetic band gap (EBG) has been developed with the patch size of approximately)./36. The dimension is controllable using the lumped capacitive elements values. The surface impedance characteristic of the EBG structure is switchable as pin vias have been inserted and removed within the EBG center and the ground plane. Switching the EBG surface...
In this paper, the design of wideband antenna with half and defected ground plane for buried object detection is presented. The antenna offers wide bandwidth from 0.5 GHz up to 3 GHz which is suitable for ground penetrating radar (GPR) system to detect buried objects under the ground surfaces. The simple structure and easy to integrate with planar substrate are the advantages of the antenna. A rectangular...
Various associations between radar reflectivity (Z) and rainfall rate (R), identified as Z-R relationships have been derived to facilitate the rainfall rate estimation by weather radar. Most of the previously proposed Z-R relationships were implied as too generalized and only applicable within the region that has identical climate characteristics or behavior. Based on such notion, the most accurate...
In this paper, a crescent moon-shaped artificial magnetic conductor (AMC) for patch antenna ground application is presented. The AMC is designed to operate at 3.5 GHz with a bandwidth of 5 %. A patch antenna operate at similar operating frequency has been designed to serves as a reference antenna. Subsequently, the proposed AMC is incorporate with the patch antenna. The AMC ground plane incorporation...
This paper presents a novel design of aperture coupled microstrip antenna (ACMSA) integrated with DGS and parasitic elements. The basic design of the proposed antenna is 2 by 2 planar array with aperture coupler feeding technique. Four dumbbell-shaped DGS are etched on the ground plane, for back radiation reduction, which is sandwiched between the upper and lower substrates. Both of the substrates...
Dielectric properties of material are being used in various industrial applications. In food industry, its usage is increasing day-by-day especially for meat products. In this paper for quality evaluation of meat, microstrip ring-resonator is presented as a sensing technique; which is simple, cost-effective and faster than other techniques. The multilayer structure of 1 GHz microstrip ring-resonator...
This paper presents a new reconfigurable multiband antenna. The slot dipole antenna is capable to operate at 2.4 GHz, 3.5 GHz and/or 5.2 GHz. This antenna can also be switched to operate at the single or dual band. Six switches are placed on the antenna structures to achieve frequency reconfigurability. While the operating frequency of this antenna is switched from triple-band to dual/single-band,...
Low-resolution ADC MIMO-Constant Envelope Modulation, MIMO-CEM, is one of the alternative candidates to the well-known MIMO-OFDM, suitable for wireless backhaul networks. One of the major problems withstands the real application of MIMO-CEM is the channel estimation. This comes from the low resolution ADC used in MIMO-CEM receiver. Intermediate Frequency (IF) based Adaptive channel estimator was previously...
Signal-to-interference plus noise ratio (SINR) and rate fairness in a system are substantial quality-of-service (QoS) metrics. The acclaimed SINR maximization (max-SINR) algorithm does not achieve fairness between user's streams, i.e., sub-stream fairness is not achieved. To this end, we propose a distributed power control algorithm to render sub-stream fairness in the system. Sub-stream fairness...
Landslide monitoring of Tenaga Nasional Berhad (TNB) transmission towers in the remote areas is a challenging process especially if the slope is at a mountainous terrain and suspected to be insecure and risky. One option is to do real time monitoring by deploying the appropriate sensors for slope failure detection such as inclinometer, rain gauge and piezometer. This study presents a monitoring network...
Feedback of proprioceptive information is important for many tele-robotic systems, especially performing a navigation task and out-of-sight remote controlling. Proprioception is defined as the ability to sense the position, location, orientation, and movement of the body and its parts. Although proprioceptive feedback is one of the significant feedbacks for tele-operations, it has not been taken much...
E-learning is a new educational concept by using the Internet technology. It delivers the digital content and provides a learner-oriented environment for the teachers and students. The Lecture Recording system is one of the devices that are widely used for E-Learning. However, the existing Lecture Recording system needs to be installed on a PC or Notebook. In this paper, a new design for lecture recording...
This paper focuses on spectrum handoff where cognitive user can returns the spectrum to demanded licensed user. Besides, the cognitive user can chooses to adjust its transmission power with sufficient protection to licensed user instead of carry out spectrum handoff. Using our proposed scheme, cognitive user switches between the bands if and only if it is unable to modify its transmission power within...
A stochastic gradient adaptation(SGA) of antenna array receiver in DSSS system is proposed in this article, the beamformers are updated by using the perturbation vector that gives the largest correlator output, and the chip-phase delay of PN code is estimated by maximizing the output of matched filter at the same time. The beamformed signal power is maximized without jammer input, and the signal-to-interference-plus-noise-ratio...
Worldwide interoperability for microwave access (WiMAX) brings additional features that can be utilized for enhancing positioning accuracy. This paper deals with WiMAX positioning scheme based on the first arrival path (FAP) of the time of arrival (TOA) technique by utilising one of WiMAX offered features i.e multiple input multiple output (MIMO) system. Simulation results show that the performance...
Principles to determine dielectric constant and loss tangent measurement using Agilent 85070E Dielectric Probe Kit 200 MHz to 50 GHztechnique is presented in this paper. The experiment objective was to measure the dielectric constant and loss tangent of Leucaena Leucocephala (Local Malaysian name Petai Belalang) material that laminated by Polypropylene Polymer. The Fabricated proposed boards were...
This article refers to the design technique related to the cross-section absorption properties of the materials absorbing electromagnetic waves. The methodology of construction of absorber, measurements of microwave absorption, description of the original laboratory set-up for measuring the absorption characteristics of the examined materials as a function of the shape of the absorber and the testing...
In this paper, A compact 3-dB directional coupler using dual transmission lines on dual substrate layer is presented. The proposed coupler comprises of two conductor layer at top and bottom substrates. These two conductors are coupled through a circular aperture in the common ground plane. The simulated proposed coupler is designed using CST Microwave Studio 2010 by using inexpensive FR-4 substrate...
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