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This paper presents the dielectric properties and shielding effectiveness (SE) of multi-walled carbon nanotubes and polyester (MWCNTs/PE) composite. A rectangular waveguide transmission line technique was used to measure dielectric properties, εr, SE of MWCNTs (1–20 weight percentage, wt%) and PE composite in microwave frequency region from 8.2 to 18 GHz. It was observed that the increase of MWCNTs...
This paper presents a multiple-layered microwave absorber using rice husk and carbon nanotube composite. The dielectric properties of each layer composite were measured and analysed. The different layer of microwave absorber enables to control the microwave absorption performance. The microwave absorption performances are demonstrated through measurements of reflectivity over the frequency range 2–18 GHz...
In this paper, a new FSPA for new application — outdoor RF energy harvesting will proposed and designed. A new FSPA structure will joint with folded patch meander line and two pairs of slot embedded into its ground plane. A less profile, less cost and ease to fabricate the folded shorted patch antenna (FSPA) will introduced. The proposed antenna designing and performing using Computer Simulation Technology...
This paper showcases the work done to create an alternative surface impedance transmission line implemented using a 3D tetrahedral meshing frequency eigenmode solver. The work was performed based on a complementary asymmetric split ring (CASR) unit cell to identify its resonance characteristic and relevant dispersion diagram at 5.9 GHz. By using this CASR singularly into a guided transmission line,...
This research paper employs a 3D tetrahedral meshing frequency solver as the main tool to simulate the electromagnetic effect of non-modified tip edge complementary asymmetric split ring (CASR) unit cell its modified triangular tip edge version. Behavior of these unit cells are intended to obtain an electromagnetic (EM) bandgap suitable to separate a beam wave into two direction as well functioning...
This research paper utilizes a 3D tetrahedral meshing frequency solver to simulate the electromagnetic effect of circular split asymmetric ring (CSAR) patterned onto a conventional microwave laminate. Behavior of the incident wave was first conducted using a bare flat metal laminate and then compared with a modified tip of CSAR surface. Comparison made between simulation and measured samples working...
Automatic grading of oil palm fresh fruit bunch is desired. In this study, a capacitive sensing system was designed and developed for the purpose of grading oil palm fresh fruit bunch. In this method, oil palm fresh fruit bunch placed between capacitive plates as a dielectric material and then measure the resulting capacitance voltage. Experiments were carried out using oil palm bunches of Tenera...
This research paper implements a 3D tetrahedral meshing frequency solver to simulate the electromagnetic effect of triangular tip (TrT) and tapered tip (TaT) added to a circular split gap. Behavior of circular rings placed inside a standard WR159 waveguide with preference to the conventional circular split ring was modelled. TrT and TaT structures optimization and validation was made using five well...
This paper present development in relation to a wideband antenna comprising a disk antenna and a plurality of circular split ring resonators coupled with a high dielectric ring. Using slotted resonators together with optimized air gap in order to achieve elevated bandwidth comes with minor setbacks: moderate gain and directivity, side coupling effect and unbalance electrical field strength and intensity...
A circular profile microstrip antenna and its related structural dimensions meant for 5850-7075 MHz Malaysia HAPS operating band are investigated here. Appearing by three layers and having layer three surface copper re-shaped on a microwave laminate. It was by varying the middle air gap spacing's height covering layer two regions. At the same time, this conditions will permit copper at layer three...
A circular profile micro strip antenna and its related structural dimensions meant for 5850-7075 MHz Malaysia HAPS operating band are investigated here. Appearing by three layers and having layer three surface copper re-shaped on a microwave laminate. It was by varying the middle air gap spacing's height covering layer two regions. At the same time, this conditions will permit copper at layer three...
A circularly microstrip antenna (CMSA) with its related geometry intended for 5850 -7075 MHz Malaysia HAPS operating band are presented here. Construction are made into three layers having layer three surface copper re-formed on a microwave laminate (εr = 2.2) and by varying its middle air gap spacing's height. At the same time, these copper at layer three will be electrically and magnetically fed...
An investigative design of a circular microstrip antenna (CMSA) and its related geometry intended for 5850–7075 MHz Malaysia HAPS operating band is presented. The structure consists of three layers, with the radiator at the top (layer three), a feed on the middle layer (layer two) and finally a grounding copper plate at the bottom (layer one). A commercial microwave laminate with permittivity ∊r =...
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