International Journal of Ultra Wideband Communications and Systems
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International Journal of Ultra Wideband Communications and Systems (6 papers in press)
CPW FED STAR SHAPED UWB ANTENNA WITH AND WITHOUT BAND-NOTCH CHARACTERISTICS by Sarthak Singhal, Amit Kumar Singh Abstract: A CPW-fed star shaped slot like monopole antenna with and without ITU-8 band notch characteristics for ultra wideband communication are proposed. They comprise a stage 1 Koch fractal star shaped radiating patch, modified feedline and slot loaded CPW ground plane. The band notch characteristic is achieved by loading the radiating patch with half wavelength long meander line slot. An impedance bandwidth of 3.1-17.6 GHz with band rejection for 8-9 GHz band (ITU-8 band) (S_11?-10 dB) is achieved. The band notch characteristic is modeled by an equivalent RLC resonant circuit. The equivalent circuit is validated with simulated input impedance and VSWR results. The proposed antenna provides an average gain of 4.4 dB over the entire band of operation for without band notched antenna. The radiation patterns are also observed to be omni-directional & bidirectional at lower frequencies with some distortions at higher frequencies. Non-band reject antenna configuration provides a fidelity factor of 90% along with a constant group delay over the entire operating band. The effect of various critical parameters on antenna performance is also analyzed. Keywords: Coplanar waveguide feeding; defected ground structure; modified feedline; star shaped monopole; ultra wideband communication.
On the Design and Analysis of Micro-Machined Frac Truss based Fractal Patch Antenna for Multiband Applications by ASHISH KUMAR, Amar Partap Singh Pharwaha Abstract: An optimal design of frac truss based fractal patch antenna for multiband applications devoted to satellite communications is proposed in this paper. The proposed antenna is iterative up to 3rd iteration with a miniaturized size of 15 mm Keywords: Frac Truss; Fractal; Micro-Machining; Bandwidth.
Design of a parallel coupled microstrip planar band-pass Chebyshev filter for 2.4GHz ISM band application by Quazi Mohmmad Alfred, Hashibul Alam Abstract: This paper demonstrates the design, simulation and fabrication of edge-coupled microstrip bandpass filter (BPF) at the center frequency around 2.4 GHz. It is very much useful on 2.4 GHz ISM band wireless communications e.g. GPS, WLAN Bluetooth and WiMax applications. The filter is built on relatively low-cost FR-4 substrate. The theoretically considered range of frequency 2.3 to 2.5 GHz and bandwidth is 200 MHz and Chebyshev filter response with 0.5 dB ripple in pass-band is preferred. The simulation values of cutoff frequency are 2.30 and 2.50 GHz with center frequency 2.4 GHz and measured values is 2.302 and 2.502GHz with center frequency 2.402 GHz. After fabrication the measurement, the results show the good agreement with theoretical consideration and simulation results. Keywords: Bandpass filter(BPF); Chebyshev filter response; microstrip; parallel coupled line; edge-coupled; even and odd mode impedance.
Special Issue on: Modern Research, Design and Implementation in High/Wide and Ultrawide Band Antennas and Propagation
Integrated Multipath Routing Protocol for well-organized Route Selection in Heterogeneous Wireless Networks by Asha G, Srivatsa S.K Abstract: Several challenges in the design and implementation of wireless networks using diverse aspects in heterogeneous applications. The important aspects of these networks are far beyond regular service but the assurance of Quality of Service (QoS) parameters. Devices connecting through wireless networks and dynamic in motion will rely on advanced networking prospects. The promise to be connected to a network anytime and anywhere is the predominant expectation from Mobile Ad-hoc Networks (MANETs). Wireless Sensor Networks extended their adaptations into a service provider of diverse Mobile Stations. The standard connectivity measures will not be applicable when mobile nodes transfer their messages through multi-hop environments or one-hop neighbors. This article documents a novel architecture of MANETs intending to perform the challenging task of ensuring service through the following improvements. Design of a good topology, the hierarchy of communication, discovering routes, quality of links, retransmission, and finally security parameters are some of the aspects which are concentrated when a protocol is derived. Considering the dynamic capacity of nodes/devices participating in the communication, the topology is the frequent parameter that gets altered in MANETs. QoS parameters along with topology-aware protocol will demand a path selection algorithm and thus the proposed work introduces an innovative path selection algorithm with optimal quality constraints. The stability of the path and connectivity between the nodes with a fast retransmission algorithm is ensured in the proposed algorithm. The protocol is simulated with different speeds, number of nodes, data range, and distance between all the nodes in an NS2 Simulator. From the results observed, it is evident that the preferred quality of service parameters such as packet delivery ratio, end to end delay, jitter and throughput are enhanced through the proposed approach for multipath routing with QoS promises. Keywords: Mobile Adhoc Networks; Multipath Routing; QoS Parameters; Link Stability; Reliable communication links.
Remote Monitoring of Indoor and Outdoor movement in Epidemiological situations utilizing UWB transceivers by Sukumar Rajendran, Prabhu J, Sandeep Kumar M, Prasanna S, Manivannan SS, Kumar P J, Maheshwari V, Prasanna M Abstract: A global pandemic has reduced mobility, impacting the healthcare assessment, and diagnostics on comorbid patients. Various challenges for location finding and indoor signaling issues give rise to the necessity for compact and low-cost ultra-wide band sensor technology. Lock down has played a vital role during crisis in engaging with specific conditions like position estimation in areas under LOS and NLOS caused by diffraction and reflection of UWB signals across obstacles. UWB based localization system with edge/fog computing is used to analyze the indoor/ outdoor usage of quarantined patients reducing the transmission, which becomes a threat for society and healthcare personals. The mathematical models to symbolize various patterns utilizing UWB sensors with Anchors and Tags to determine the flow of all rapid and random movements within the specified clustered locations. The proposed system achieves high classification accuracy with SVM to classify the patterns and assist frontline medical workers in containing pandemics through human interaction. Keywords: Ultra-wide band; SVM; Mathematical model; COVID-19; Localization; Motion Detection; Wireless positioning systems; Healthcare.
Special Issue on: Cognitive Computing Sensing, Security and Challenges
Clusters based Rendezvousing Approach for Scheduling the Flash Crowd Transmissions over Cognitive Radio Networks by Suneetha Chalasani, S. Srinivasa Rao, K.S. Ramesh Abstract: Rendezvousing the transmissions and radio frequencies is a crucial objective to achieve optimal utilization of the spectrum bands by secondary users in cognitive radio networks. Many dimensions of research, such as attaining quality of service during transmissions occurring through spectrum bands, optimizing security factors to enable fair and trusted transmissions over spectrum bands is happening in the recent past.However, optimizing the spectrum band utilization by rendezvousing the transmissions and radio frequencies of spectrum band as transmission channels is essential against the massive transmissions (flash crowd) framed by multiple users. Concerning this, a batch processing approach called Clusters based Rendezvousing Approach for Scheduling the Flash Crowd Transmissions over Cognitive Radio Networks has proposed in this manuscript.A new distance measuring technique has adapted to perform a clustering process, which has applied on both buffered transmissions and idle radio frequencies. The results obtained from an experimental study indicating the comparatively better performance from the proposed model and, if utilized within the definitive frameworks, can yield better performance results. Keywords: Dynamic Spectrum Access; flash crowd; Cognitive Radio Networks; Primary Users; Secondary Users; Spectrum Assignment.