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A novel multi-resonator using rectangular slotted complementary split ring resonator (CSRR) on planar transmission line is proposed for the design of chipless RFID tag. The chipless design consists of 4 rings resonator which etched on the back of the substrate and is connected to 50 ohm planar transmission line. Each resonator enables to code in four different allocations (00, 01, 10, 11) with bandwidth...
This paper presents the design of multiband reconfigurable antenna using metamaterial Electromagnetic Band Gap (EBG) unit cells. The two EBG unit cells were position underneath the feeding of the antenna. By implementing the band gap characteristics of the EBG, the antenna can be reconfigured at various multiband frequencies simultaneously. The EBG band gap characteristics of the EBG unit cells were...
Frequency reconfigurable square ring slot antenna is presented. The designed antenna comprises of two small rectangular ring slot and a square ring slot fed by a microstrip transmission line. Two switches are placed between the square and rectangular ring slot which provides frequency reconfigurability. The designed antenna is capable of reconfiguring to three frequency bands which at 1.9 GHz, 2.1...
This paper presents the design of wideband antenna integrated with triple band artificial magnetic conductor (AMC) ground plane. The wideband antenna that acts as Reference Antenna (RA) operates from 2.69 GHz up to 6.27 GHz while the triple band AMC operates at 2.3 GHz, 5.8 GHz and 8.3 GHz. The investigation is carried out to observe the capability of triple band AMC to excite at least three new narrowband...
A wideband metamaterial antenna employing SRR loading is presented. Two designs were simulated, fabricated and measured. The bandwidth enhancement is achieved by loading SRR resonator onto a conventional monopole antenna. The SRR excited a lower resonance frequency mode which matches with the resonance frequency of the monopole antenna thereby extending the overall impedance bandwidth from 26% to...
A meandered microstrip transmission line resonator is proposed for the design of chip-less RFID tag. The 6 bit resonator is operates from 3 to 5 GHz. The tag consists of a micro strip open stub resonators and two Ultra-wide Band (UWB) monopole antennas. The 30 mm × 35 mm chip-less RFID tag is designed on Taconic substrate with permittivity of 2.75. The modification technique from the straight line...
This paper presents the design of leaf shaped dual band flexible textile antenna. The textile antenna designed at 1.8GHz suitable for Long Term Evolution (LTE) and 2.8GHz WiMAX application. To enhance the flexibility of the proposed antenna and for the comfort of the user, denim textile is used as a substrate material. The conductive copper tape is used as the conducting element. The study also describes...
This paper presents a tunable Artificial Magnetic Conductor (AMC) unit cell design by means of four copper strips. With the inclusion of copper strips, the initial reflection phase of dual band AMC changes from 2.45 GHz and 5.8 GHz to single frequency of 3 GHz. To facilitate the tunable function on antenna performance, an Ultra-Wideband (UWB) antenna has been designed and analyzed. Performance comparison...
A design of 45° phase shifter which operates at ultra wideband (UWB) operating frequency is presented in this paper. The design employs multilayer technology to achieve a broad coupling and compact size. The simulation result shows that the proposed phase shifter is acceptable to be used for UWB application. Parametric analysis on the dimension of the square patch will be carried out to observe the...
Wireless electricity (Witricity) application is recently gaining interest owing to its effectiveness and reliability in mid-range wireless power transfer (WPT). This paper presents a parametric study on Witricity design in order to achieve a good coupling efficiency in term of S21 at the targeted frequency. The dimension of the design is 80 mm × 80 mm, which offer 75% size reduction compared to previous...
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...
In wireless communication system, the design and performance evaluation of any transceiver can be achieved with the aid of an approximate channel model. Since, there are different communication channels with dedicated transceiver structure and signaling, the availability of a generic channel model for the entire channels is very useful. This paper presents the development of wireless channel simulator...
This paper presents a compact 3-dB coupler on a dual substrate layer with a rectangular slotted microstrip ground plane. The coupler is designed for operating frequency at 2.45 GHz using an inexpensive FR-4 substrate. A compact coupler design with dimension of 19 mm × 7.5 mm offers a size reduction of 62 % while simultaneously enhanced the bandwidth to 42.7 % compared to a conventional coupler.
This paper presents a design of Artificial Magnetic Conductor (AMC). The AMC operates in three operating frequencies which are 2.3 GHz, 5.8 GHz and 8.36 GHz with the bandwidth of 5.64 %, 1.73% and 3.58 % respectively. The size of AMC unit cells is relatively smaller compare to previous researches that have been done. Parametric results for the reflection phase diagram are also presented.
The design of 45 degree multilayer microstrip-slot phase shifter operating at 2.45GHz is presented in this paper. The device consists of a ground conductor layer in the middle of the two substrates.The design is accomplished with the use of design software and EM analysis. Low insertion loss and good return loss performances at 2.45GHz for the designed structures are noted.
In this paper, an array of series fed antenna based on tapering patch width and through element is presented. The antenna has wide impedance bandwidth of 16.18% covering from 5.34 GHz to 6.28 GHz with a gain of 6.53 dBi. The use of through element technique reduces the overall length of array structure by 25.47%. It also has lower side lobe level, and wider impedance bandwidth compared to the past...
A dual-band B-shaped monopole antenna for MIMO application is presented. The proposed antenna consists of B-shaped element which operates at dual band frequencies of 2.45GHz and 5.8GHz. The prototype has been fabricated and when tested, the impedance bandwidths are 29.9% and 33.8% for 2.45GHz and 5.8GHz, respectively. Good agreement between the measurement and simulation results in term of return...
An X-Polarization array microstrip patch antenna for WiMAX application is introduced in this paper. The array antenna operates at WiMAX frequency of 3.55 GHz. The substrate used is FR-4 with the thickness of 1.6 mm, relative permittivity of 4.5 and loss tangent of 0.019. The antenna use parallel feeding network to feed all the eight elements with coaxial port. The array has gain of 6 dBi, and directivity...
We examine the relative merits of bank versus trade credit in a supply chain consisting of a manufacturer and a capital-constrained retailer. We show that trade credit is more effective than bank credit in mitigating double marginalization in the supply chain when marginal production cost is relatively low, and that bank credit becomes more effective otherwise.
From a process perspective, the tasks that individuals carry out within an organization are linked. These linkages are often documented as process flow diagrams that connect the data inputs and outputs of individuals. In such a connected setting, the differences among individuals in preference for data attributes such as timeliness, accuracy, etc., can cause data quality problems. For example, individuals...
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