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Network virtualization (NV) is an indispensable approach to handle the ossification of current Internet. Previous research has been conducted concerning the implementation issues like heuristic-based mapping algorithms, yet little has focused on quality of service (QoS) for end users who launch virtual network (VN) requests, and revenue both service providers and infrastructure providers can obtain...
Wireless network virtualization has gained a lot of interest from academic research and is seen as a promising way to relieve the rigid network problem due to its abstraction and sharing of infrastructure and radio spectrum resources. Some algorithms have been proposed to assign physical resources to virtual networks in an efficient way regardless of the change of user's demand during their entire...
We have designed two end-fire antennas on LTCC with horizontal and vertical polarizations respectively. The antennas operate at 38GHz, a potential frequency for 5G applications. The horizontally-polarized antenna provide a broadband performance about 27% and 6dB end-fire gain and the vertically-polarized one provide a 12.5% bandwidth and 5dB gain. Both antenna are integrated under a compact substrate...
According to the analysis of substrate integrated waveguide structure, a design of double-layer and seven-order MEMS bandpass filter using network synthesis is proposed in this paper. The simulation and optimization are explained with Ansoft HFSS. Based on MEMS technology, a millimeter-wave filter is designed with a center frequency at 30GHz, the 1dB bandwidth range is 690MHz, the passband return...
As virtualization is becoming a promising way to support various emerging application, efficient virtual network embedding (VNE) algorithm is becoming more and more important. In this paper, we investigate the VNE problem from a new perspective. We propose two concepts of strongly connected graph and weakly connected graph in undirected graph witch are similar to the concepts in directed graph. With...
Planar chial meta-surface (PCM) is a class of meta-materials, consisted of a two dimensional surface grating with a chiral-shaped pattern in its unitcell. It has been reported that appropriate choice of film materials and the shape of chiral pattern made it possible to induce giant optical activity (polarization rotation) [1]. In this study we focused on Si/Si3N4/SiO2 PCM and investigated its potential...
This paper presents the effect of dimensions, spacing, periodicity and shapes of Reactive Impedance Surface (RIS) elements on resonating frequency of a suspended 2 × 2 MSA antenna array designed on a RIS loaded FR4 substrate. RIS consists of 13 × 13 square patch array with each patch of side 4mm and 1mm inter-element spacing. Elements of MSA array are fed through a feed line network which is fed by...
In this paper, a novel electrically tunable bandpass filter with constant fractional bandwidth based on the half-mode substrate integrated waveguide(HMSIW) with magnetic coupling is presented. Varactors are used as the tunable elements, and the varactors in each tunable element are connected in parallel to reduce the insertion loss of the filter. The prototype with overall size of 20mm × 30mm × 2mm...
This paper presents a printed monopole antenna for Ultra-Wideband (UWB) communication. The designed antenna consists of a circular disc radiator and a partial ridged ground plane. The proposed antenna has overall dimensions of 38mm × 38mm × 1.6 mm. The printed monopole antenna has been realized by using the FR-4 printed circuit board substrate. The permittivity of the substrate is 4.6 and loss tangent...
The advantages of broad band and high efficiency make CBSA (cavity-backed slot antenna) a potential alternative for modern SAR (Synthetic Aperture Radar) systems. Therefore, a broadband CBSA is proposed for dual-polarization SAR system. By adopting double-layer wide slots and strip-lines feed, dual-polarization is achieved while still maintaining broad bandwidth. To enhance the antenna integration,...
Ultra wide band system is a short-haul wireless communication with advantages of low power consumption, high data rate, resistance to interference, co-existence with narrowband systems and so on. A new-type ultra wide band antenna is proposed to solve the problems of miniaturization and integration. To realize on-chip system and combine with other functional microwave monolithic integrated circuits,...
The loop types such as the three- and four-legged loaded unit cells, the circular loops, and the square loops and the hexagonal loops are widely used to design the frequency selective surface (FSS) for a number of applications. Correlation analysis and evaluation of them are investigated in previous works. In this work, we try to use another loop, namely triangular loop, for designing the FSS. A multi...
This paper presents high gain substrate slotted microstrip patch antenna design for X-band satellite applications. The proposed antenna has been designed by using the substrate of Flame Retardant 4 (FR4) having dielectric constant εr of 4.4. The ground, patch and the feedline are made of copper material having thickness of 0.02mm and conductivity of 5.58 × 106 Siemens/m. The proposed antenna has been...
This paper presents an optically transparent equilateral triangular shaped microstrip patch antenna made of transparent ITO (Indium Tin Oxide) film. The transparent triangular microstrip antenna comprises a thin sheet of soda lime glass substrate with conductive ITO film coating radiating patch and ground plane and is feed through a CPW feeding technique. The inverted L-shape slot in the ground is...
Network virtualization has been proposed to be a promising way to solve the Internet ossification problem. One of the main challenges for network virtualization is the virtual network embedding (VNE) problem, which focuses on the efficiency of the substrate resources allocation and involves the virtual node and link mapping problems. Node mapping process has serious influence on the whole mapping...
This paper investigates the development of branchline coupler using parallel coupled transmission lines on planar microstrip using CST Studio Suite 2010 design tool. This project operates within 4 GHz to 8 GHz frequency band. Two designs are proposed in this project which are basic branch line coupler and branch line coupler with parallel line feeding technique. The main purpose of this study is to...
A broadband substrate integrated dielectric resonator antenna (BSIDRA) is presented and investigated experimentally. The proposed BSIDRA consists of a substrate integrated dielectric resonator (SIDR) fed by a substrate integrated waveguide with an exciting slot. Dual resonances of the SIDR and the exciting slot radiator are merged to expand the antenna bandwidth. To validate the proposed concept,...
A substrate integrated waveguide (SIW) end-fire antenna is proposed and analyzed for achieving wideband dual circularly polarized radiation performance. Wave-polarization is realized through constructing a two-layer SIW polarizer. The sloping slot etched on the common broad wall of the stacked SIWs could gradually induce a horizontally polarized electric field with a certain phase shift. Furthermore,...
In this paper, a wideband substrate integrated waveguide (SIW) horn antenna with enhanced performance is investigated. Through adding metallic via on the edge of the parallel plates, additional inductance is introduced and can compensate the coupling capacitance in some degree, which significantly improves the impedance matching of the planar horn antenna. Moreover, the introduced via act as the extended...
This paper presents a novel substrate integrated dual-wideband magneto-electric (ME) dipole antenna for WLAN and WiMAX applications. By employing a ladder-shaped feeding structure to excite the dual-layer electric dipole radiated patches, a dual-band feature can be acquired. Besides, by using the ladder-shaped feeding structure and the printed metal via technology, the impedance matching can be easily...
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