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A compact dual-frequency antenna with two-port excitation and large frequency ratio is presented. It consists of a circularly-polarized (CP) microstrip patch antenna at 2.4 GHz and a linearly-polarized (LP) substrate-integrated cylindrical dielectric resonator antenna (DRA) at 60 GHz, resulting in a large frequency ratio of as high as 25. The two antenna parts are designed on a single substrate, giving...
Network virtualization enables the decoupling of network services from the underlying hardware infrastructure to allow the same Substrate/physical Network (SN) shared by multiple Virtual Network (VN) requests. The process of mapping virtual nodes and links onto a shared SN while satisfying the computing and bandwidth constraints is referred to Virtual Network Embedding (VNE) as an NP-hard problem...
Perceived as a key enabling technology for the future Internet, Network Virtualization (NV) allows an Infrastructure Provider (InP) to better utilize their Substrate Network (SN) by provisioning multiple Virtual Networks (VNs) from different Service Providers (SPs). A key challenge in NV is to efficiently map the VN requests from SPs on an SN, known as the Virtual Network Embedding (VNE) problem....
The proposed paper presents two I-shaped substrate slotted flexible microstrip patch antennas with reduced ground for radiolocation and military applications. The proposed antennas employ cellulose acetate having dielectric constant (∊r) of 4.2 as the substrate. The copper having conductivity of 5.95 × 108 Siemens m−1 has been used for designing of patch and ground. The substrate, patch slot and ground...
In this paper a novel Substrate Integrated Waveguide(SIW) filter has been proposed, bended with 150° angle and loaded with cylindrical iris for obtaining the filtering characteristic in the range of Ku band. 150°bend within the SIW structure is provided to facilitate its integration ability over planar Microwave Integrated Circuits (MICs). Several configurations of iris are analysed for obtaining...
The circular ring with rectangular patch antenna (CRRPA) has designed for air borne radar applications at 27.7GHz frequency. On the substrate, circular ring with rectangular patch has loaded for obtain the wide band frequency range is 21GHz–31.8GHz. On the ground plane of substrate small rectangular slot has loaded to enhance the gain. The results are presented and return loss is obtained −36.5dB,...
In this paper, we designed the Antenna on a Novel substrate material, which is used to resonate the high frequency in the range of Terahertz. The Antenna has been made up of the model of the microstrip antenna. The Nanoantenna designed and executed in the software HFFS simulation by using different shapes. The simulation result shows the increase in bandwidth as well as the reduction in loss response...
In this paper, the effect of using square cavity with two arc corners on a SIW cavity backed slot antenna is presented. The arc perturbation technique is used to separate the resonant frequencies of two degenerated modes in a square SIW cavity. The behavior of an individual SIW cavity with 2 different arc corners is discussed. The bandwidth improvement is achieved using an arc perturbation technique...
In this work, we present a miniature multi-layered patch antenna for K-band applications. The size of the antenna has been optimized by using two substrates layers, introducing a rectangular probe between the layers, and insertion of an air-filled cavity into the lower substrate. Analysis and modeling were performed using the HFSS (High Frequency Structure Simulator) simulator based on the finite...
Integrated silicon packages, such as System in Package, are becoming more popular as electronic packaging solutions, and this technology is driving the need for finer and finer circuit pattern designs. However, optical inspection methodologies are reaching their limits in detecting defects efficiently at these smaller dimensions. This potential technology gap could negatively impact yield performance...
The need in today's wireless applications is to design antennas that are compact, robust and effortless to integrate with RF circuit components. Microstrip patch antenna is one such type which satisfies these requirements. But the two main performance parameters of an antenna namely the gain and the bandwidth are near to the ground for patch antennas. Usually the gain range of a patch antenna is 1–2dB...
There is a great development in wireless communication were wireless plays a important role in all day to day things starting from home appliances to military application. Antenna is a device that plays a major role in these applications. Wearable antenna have been welcome nowadays due to the UWB that promises high data rate with wider bandwidth along with low power consumption. Textile antenna is...
This work proposes the utilization of the Reflect Array (RA) antenna in the reader of the Frequency Coded (FC) chipless RFID systems aiming at increasing the reading range, minimizing the environmental reflections and acquiring a lot of novel capabilities that can not be provided by the conventional antenna systems. The FC chipless RFID system requires an UWB range of frequencies to accommodate multiple...
This paper presents a novel circular polarized slot antenna design using microstrip-ridge gap waveguide technology, it possesses the easy manufacturing since it realizes the gap waveguide with PCB process. The antenna is composed of two substrates, by using the ring slot with a shorted strip on the upper substrate and the EBG textures located on the lower substrate, the circular polarized characteristic...
This paper presents two novel designs of SIW H-plane horn antenna which are achieved by adding different double square loops as transition structure. The double square loop and its improvement rotated double square loop are adopted to improve the mismatch between the horn and free space. By optimizing the dimensions of the double square loop structure and rotation angle, the bandwidth performance...
In this paper, a multilayer substrate integrated waveguide (SIW) cavity-backed slot antenna array with wideband performance is proposed. In order to broaden the operating bandwidth of SIW slot antenna, multilayer cavities with gradually decreased permittivity and expanded aperture sizes are loaded above the slot, which realizes a smooth transition between SIW slot and free space. A wideband feeding...
A suspended plate antenna (SPA) with L-probe feed is of interest as an efficient non-contacting feed method. It maintains high efficiency even when the plate is constructed of poorly conducting materials such as conductive inks. An SPA is designed at 10 GHz where fabrication tolerances can have an impact on performance. The SPA as designed has 36 percent impedance bandwidth and 8 to 9 dBi of gain...
This paper focuses on placement and chaining of virtualized network functions (VNFs) in Network Function Virtualization Infrastructures (NFVI) for emerging software networks serving multiple tenants. Tenants can request network services to the NFVI in the form of service function chains (in the IETF SFC sense) or VNF Forwarding Graphs (VNF-FG in the case of ETSI) in support of their applications and...
We present a novel tightly coupled dipole array (TCDA) that achieves 67:1 bandwidth over the 30 MHz to 2 GHz frequency range. The design is extremely simple, and consists of 3 overlapping dipoles that are fed at 3 different locations to ensure uniform current flow. The overlapping dipoles are “printed” on a 0.3 mm-thick polymer substrate (εr=3), and “sandwiched” between two layers of flexible polymer...
The requirement for greater bandwidth in military satellite communication systems has resulted in research for systems that can be used in the EHF band. To support this requirement, the Department of National Defence has sponsored the development of unique Canadian technology under the CANMILSATCOM project that is part of the Canadian commitment to the US Advanced EHF Satcom (AEHF) project. The end...
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