Forthcoming articles

 


International Journal of Ultra Wideband Communications and Systems

 

These articles have been peer-reviewed and accepted for publication in IJUWBCS, but are pending final changes, are not yet published and may not appear here in their final order of publication until they are assigned to issues. Therefore, the content conforms to our standards but the presentation (e.g. typesetting and proof-reading) is not necessarily up to the Inderscience standard. Additionally, titles, authors, abstracts and keywords may change before publication. Articles will not be published until the final proofs are validated by their authors.

 

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International Journal of Ultra Wideband Communications and Systems (3 papers in press)

 

Regular Issues

 

  • Queueing Analysis of Ultra-wideband Medium Access Control Protocol with Finite Buffer   Order a copy of this article
    by Hassan Al-Mahdi 
    Abstract: Ultra-wideband (UWB) communication has recently emerged as a technology that offers high data rate services for future wireless personal area networks. Due to its high bandwidth, it is substantial to design medium access control (MAC) protocols that perfectly utilize the available shared bandwidth offered by UWB technology. The available bandwidth may be used as a single band or as several bands. Recently, the multi-band MAC protocols of the UWB communication have received a great attention in research domain. This paper introduces an extensive 4-dimensional Markov chain queueing model to investigate the performance of MAC protocol that was proposed in literature in terms of system occupancy, waiting time, throughput, packet loss and blocking probability. Furthermore, we modify the analyzed protocol by attaching a finite buffer inside every node. Our motivation is to precisely estimate packets collision probability due to randomly selection of receivers or bands. Besides introducing the finite buffer, our queuing model reflects the system behavior in-depth. Next, we validate the obtained analytic results using discrete-event simulation. Finally, we introduce an outline of a proposal to eliminate the randomness of selecting receivers and bands.
    Keywords: Ultra-wideband; Queueing network; performance evaluation; medium access control; ad hoc networks.

  • Compact UWB Filter with Narrow Notched Band Based on Grounded Circular Patch Resonator   Order a copy of this article
    by Mona Yazdani, Javad Ahmadi-Shokouh 
    Abstract: In this paper, a compact ultra-wideband (UWB) bandpass filter (BPF) with a single narrow notched band is proposed. This filter is designed using a novel multiple-mode resonator (MMR) based on a grounded circular patch resonator (GCPR). The proposed MMR generates three main resonances and two transmission zeros (TZs). A semi-lozenge slot (SLS) is proposed to control resonant frequencies and obtain UWB operation. The 3dB notched band is achieved from 5.65-5.8 GHz by connecting an arrowhead stub inside the filter. The UWB filter has been simulated, fabricated and measured. The dimension of the designed filter is about 0.31
    Keywords: band-pass filter; circular patch resonator; compact; notched band; ultra-wide band.

  • High Gain Dual-Polarized Pentagonal Microstrip Antenna for Wireless Communications   Order a copy of this article
    by Raghunath Bhadade, Shrinivas Mahajan 
    Abstract: In this paper we propose a dual polarized pentagonal microstrip antenna for Massive MIMO Base Station to operate at 2.4 GHz WLAN band (IEEE 802.11 b/g/n/ax). The various researchers have used antenna array with different feeds for the Massive MIMO BS to obtain the desired gain with required impedance bandwidth. However, this proposed work contradicts with existing method by using a single novel radiating element with suspended substrate to achieve the desired gain and required impedance bandwidth. The circular polarization is achieved by using two coaxial-probe feeds. The main focus of research is on the selection of proper shape of the radiating element for Massive MIMO BS. The proposed antenna is successfully simulated using HFSS 13.0, fabricated on a FR-4 substrate and measured. The proposed antenna exhibits a much higher gain of 6.17dB, improved impedance bandwidth of 171.9 MHz (Return loss, S11= -10dB) , the axial ratio (AR) is 1.78dB (< 3dB), the patch area of 1775 mm2 , and also yields return loss better than -15 dB around the center frequency of 2.45 GHz. The measured characteristics of the antenna are in good agreement with the simulated results.
    Keywords: Microstrip Antenna; Gain; Input impedance; Return loss.