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Filter in telecommunication is a device which has function like a frequency band selector. it plays an significant role especially to select the frequency band that is wanted to be passed through. At this advanced technology era where every device is getting compact in design and size, the filter model also has been challenged in order to meet and fit the recent situation. The microstrip filter is...
Millimeter wave technology has facilitated new commercial gigabit wireless applications which require large bandwidth. Circular polarized millimeter wave antennas act as an efficient tool for suppressing the multipath fading effects seen in millimeter wave band. In this paper, a circularly polarized substrate integrated waveguide fed aperture coupled antenna at 60 GHz is presented. The circular polarization...
This paper demonstrates the design and performance analysis of the star shaped microstrip patch antenna. The proposed antenna design employs substrate of FR4 material having thickness and dielectric constant of 1.6 mm and 4.4 respectively. The proposed antenna design consists of a FR4 substrate, star shaped radiating copper patch and slotted ground forming star shaped microstrip patch antenna configuration...
Carrier lifetime limited bandwidth in proposed III-Nitride LED is relaxed with further improvement in its internal quantum efficiency. Moderate output power (1.7mW) with record-high 3-dB electrical-to-optical bandwidth (1GHz) among all reported visible LEDs is demonstrated.
The functionality of communication networks can be extended by using overlay networks. One interesting application of this idea is to acquire more flexibility in path choices through the network without introducing new mechanisms or physical changes to the underlying topology. This paper studies the benefits of installing main and backup paths assisted by an overlay network, solving this problem at...
Network functions virtualization is a new technology for the future internet that eliminates the dependency of the network function and the hardware requirement. The network functions virtualization provides a successful approach for meeting the increase in demand of the end-to-end (E2E) services with low operational and capital costs. Replacing the network specific purpose hardware (e.g. firewall)...
The main challenge in network visualization is known as so called virtual network embedding(VNE). Most proposed VNE algorithms are heuristic so far in the literature. This paper presents an exact algorithm based on the Integer Linear Programming(ILP) of optimization theory. The exact algorithm VNE-ILP is able to simultaneously map virtual nodes and virtual links of VNRs. The constraint of virtual...
The effects of thickness and dielectric constant of flexible substrates on the performance of a circular planar monopole antenna (PMA) is reported in this paper. The antenna is printed on a flexible Polyimide substrate and fed by 50 Ω microstrip line. Results revealed that substantial effect on the antenna performance due to substrate thickness and material even if the radiating structure is ungrounded...
An ever increasing utility and use of virtualization in various emerging scenarios, e.g.: Cloud Computing, Software Defined Networks, Data Streaming Processing, asks the Infrastructure Providers (InPs) to optimize the allocation of the virtual network requests (VNRs) into a substrate network. In this paper we present a two-stage virtual network embedding (VNE) algorithm, which map first virtual nodes...
Airborne ultrasonic inspection is performed in through transmission, where the test piece (e.g. adhesive joint or polymer-based composite plate) is placed between the transmitter and the receiver. However, many structures with difficult shapes allow only one-sided inspection. The strong reflection of the signal from the surface overshadows the signals from the inside, so that broadband pulses are...
This paper is about new class of band-pass Frequency Selective Surface (FSS) that works at X-band. For this purpose, two structures are presented. First structure same as traditional FSS uses aperture element and can control bandwidth with changing lengths. For single layer resonant frequency is located at 9.86GHz and the range of −3dB bandwidth is between 7.44 to 12.42GHz (4.98GHz). In order to made...
One main challenge in network virtualization is known as virtual network embedding(VNE). VNE is NP-hard and most algorithms in the literature are heuristic. This paper presents an exact algorithm based on the Integer Linear Programming(ILP). The exact algorithm aims to simultaneously minimize the cost of substrate network and average virtual link delay of mapped VNRs. Simulation results reveal that...
In this demonstrative work, rectangular microstrip patch antenna has been proposed. Teflon substrate having thickness of 4mm and dielectric constant of εr = 2.1 has been employed. The design and analysis of the proposed system has been carried out on Computer Simulation Technology (CST) Microwave Studio 2014. The proposed antenna has compact size, light weight. The proposed antenna ground and patch...
This paper presents a broadband, dual-polarized substrate integrated waveguide cavity-backed slot antenna. In this design, high-order cavity resonances are used to generate arbitrary levels of inclined linear polarization. The antenna can provide an adjustable inclined linearly polarized with an aspect ratio of Ex/Ey ranging from 0.11 to 0.69. The proposed antenna provides fractional impedance bandwidth...
This paper concentrates on the design and performance analysis of blind hole substrate slotted microstrip patch antenna design for X-band applications. The anticipated antenna has been designed using Flame Retardant 4 (FR4) substrate of dielectric constant, εr of 4.4 sandwiched between copper patch and ground plane. The intended antenna has compact area with impedance bandwidth of 560 MHz (7.67 GHz–...
An optimized planar antenna for transceiver operating at 1800 MHz (DCS band) is designed and presented. The designed microstrip antenna is used for Digital cellular system operating at the frequency of 1800 MHz with the return loss better than 10 dB.FR4 substrate is used in the design with lesser occupancy of 50*40*3.8mm3. The simulated design of antenna confirms satisfactory output gain and omnidirectional...
A new approach is investigated to enhance the gain of Microstrip Antenna Array using the substrate integrated waveguide (SIW). Integration of SIW is implemented firstly in single microstrip antenna and then in 4×1 array. Rectangular microstrip antenna array is backed with SIW cavity is designed to improve gain as well as bandwidth for wireless communication applications. Proposed antenna array acquires...
Network visualization in Elastic Optical Networks (EONs) utilizes the flexible spectral resources to map Virtual Networks (VN) requests onto the physical substrate network. The process of mapping the VN requests onto the physical substrate network is called Virtual Network Embedding (VNE) problem. The use of EONs in network virtualization brings in an additional requirement of satisfying the spectrum-continuity...
We demonstrate a substrate-removed silicon Mach-Zehnder modulator with the 3-dB electro-optical bandwith beyond 50 GHz. Based on this modulator, 80 Gb/s on-off-keying and 50 Gbaud PAM-4 optical modulations are experimentally achieved without electrical pre-equlization.
Folded substrate integrated waveguide (FSIW) has been proposed for further size reduction, while keeping the advantages of traditional SIW. FSIW-based horn antennas are very promising in millimeter wave applications. To improve the bandwidth and efficiency of such antennas, a thick substrate is preferred but the microstrip feeding line becomes unacceptly wide to obtain a reasonable impedance. This...
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