Directive Antenna for Ultrawideband Medical Imaging Systems by Amin M. Abbosh

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On Eavesdropping Attacks in Wireless Sensor Networks with Directional Antennas by Hong-Ning Dai, Qiu Wang, Dong Li, Raymond Chi-Wing Wong

“…The reason of the improved security of WSNs with directional antennas lies in (i) the smaller exposure region of a directional antenna and (ii) the fewer hops to route a packet due to the longer transmission range of a directional antenna. …”
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Selective Cooperative Transmission in Ad Hoc Networks with Directional Antennas by Eui-Jik Kim, Sungkwan Youm

“…This paper presents a selective cooperative transmission scheme (abbreviated SCT) for ad hoc network with directional antennas that leverages the benefits of directional-only antenna approach and cooperative communication. …”
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A Wideband Printed Directional Antenna Array with Impedance Regulating Load by Chun-Ying Kang, Shu Lin, Li-Wen Jing, Yu Tian, Jia-Xin Dong, Jia Lu

“…We proposed a broadband directional antenna array working at mobile communication frequency band, which achieves a relative bandwidth of 50.7%. …”
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Tractable yet effective approximation to directional antenna array for millimeter-wave networks by Na DENG, Haichao WEI

“…The complexity of the actual antenna pattern imposes restrictions on investigating the benefits of directional antenna arrays in large-scale networks.Hence,a novel multi-level flat-top antenna pattern was proposed to approximate and simplify the actual one and was applied in millimeter-wave cellular networks for performance analysis.To fully characterize the impact of the directional antenna array on the user performance,stochastic geometry was adopted to establish an analytical framework for millimeter-wave cellular networks and derive the coverage probability and transmission rate of the typical user with the proposed multi-level flat-top antenna pattern,including the exact and bounding expressions.The simulation results show that the proposed antenna pattern provides a better tradeoff between the accuracy and tractability than previous patterns.…”
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High-Directivity Antenna Array Based on Artificial Electromagnetic Metamaterials with Low Refractive Index by Zhigang Xiao, Jiang Yao, Shaoquan Yin

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Performance analysis of multi-relay DF cooperative communication system based on directional antenna by Mingwei WANG, Huisheng ZHANG, Lixin LI, Lifeng HE

“…In order to achieve reliable communication in multi-relay cooperative communication，the directional antenna combining multi-relay cooperative communication system and optimal relay selection decode-and-forward cooperative strategy was presented.Firstly，the theoretical closed form of outage probability of the communication system using directional antenna operating in the three modes of DT-DR，DT-OR and OT-OR were presented.Then for three kinds mode，the collaboration communication system interrupt probability and signal-to-noise ratio，the number of relay nodes，the antenna gain channel fading efficiency and relationship between the channel capacity were analyzed in numerical simulation.These findings reveal that excellent performance of cooperative communication system with directional antennas could be achieved such as smaller outage probability and improved by best relay nodes and optimal power allocation coefficient.…”
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Gateway Deployment Optimization in Wireless Mesh Backbone Network Based on Closeness Centrality by Chengxin Guo, Taoshen Li, Zhihui Ge

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Directional microwave ablation in spine: experimental assessment of computational modeling by Austin Pfannenstiel, Haileigh Avellar, Clay Hallman, Brandon L. Plattner, Margaret A. Highland, Francois H. Cornelis, Warren L. Beard, Punit Prakash

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Cramér-Rao Bound Analysis of Spatial Effects in 2D TOA Localization With Directive Antennas by Imran Moez Khan, Xuezhi Wang, William Moran, Wayne S. T. Rowe

“…This paper introduces a new, more realistic and comprehensive model that accounts for directive antennas, offering a significant improvement over conventional TOA localization theory. …”
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Single anchor node real-time positioning algorithm based on the antenna array by Yong Fu

“…This article presents an anchor node based on directional antenna array and reports the design of an automatic test system. …”
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Coverage in airborne backbone network by Bo ZHENG, Hengyang ZHANG, Yong LI, Wei CHENG

“…The high-altitude long-durance unmanned aerial vehicle (HALE-UAV) equipped with directional antenna and the cuboid-shaped air corridor (AC) were taken as the study objects,and the basic idea was to extract the invariant coverage area of moving spherical cones,cylinder,as the basic component to fill AC.The general goal was to employ HALE-UAV as few as possible under the condition that the height of the cylinder was larger than that of AC.The circular and triangular orbits of HALE-UAV were analyzed in geometry respectively,and the mathematical expressions of the radius and height of the cylinder were derived.Then two coverage schemes were introduced.Through comparing the two schemes by optimization theory,the optimal coverage strategy was derived.Results show that the circular orbit is better than the triangular orbit.Moreover,the optimal solution is to employ the quasi-static floating platforms,and the suboptimal is to adopt the circular orbit of a small radius,or the triangular orbit of a small side,with a HALE-UAV on an orbit.…”
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Geometrical statistical channel model with an Inverted-Parabolic spatial distribution by Jie ZHOU, Dong-dong XU, Kikuchi HISAKAZU

“…,a proper geometrical statistical channel model was proposed with inverted-parabolic spatial distribution around mobile station(MS) by using geometric partitioning method.Closed-form expressions for probability density functions(PDF) of AOA ,TOA and DS in the outdoor macrocell and microcell wireless environments were derived.Compared with the uniform and Gaussian scatter density model,the observed results consist with previous theory and experience.In addition,the Doppler spectra at the MS was also presented and the Clarke U-shaped model was modified.Employing the channel model,the effect of directional antenna was analyzed with the main-lobe width 2α at the BS and D/R and φ .v…”
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Magnetic-Electric Dipole Antenna with Circular Polarization Feature and Directional Pattern with Improved Bandwidth by Seied Ali Banihashem, Pejman Mohammadi, Yashar Zehforoosh

“…This paper introduces a new and compact structure of a directional antenna consisting of an electric dipole and a truncated connection element. …”
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Efficient Design of the Microstrip Reflectarray Antenna by Optimizing the Reflection Phase Curve by Xing Chen, Qiang Chen, Pan Feng, Kama Huang

“…The microstrip reflectarray antenna is an attractive directional antenna combining advantages of both the reflector and the microstrip array antenna. …”
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Anomalous Long‐Distance Propagation of ILS LOC Signals by the Es Layer and Its Impact on Aviation Receivers by S. Saito, K. Hosokawa, J. Sakai, I. Tomizawa

“…The maximum received power was −99 dBm for an omni‐directional antenna. It was strong enough to cause co‐channel interference. …”
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An Omni-Directional Wideband Patch Antenna with Parasitic Elements for Sub-6 GHz Band Applications by Liton Chandra Paul, Himel Kumar Saha, Tithi Rani, Md. Zulfiker Mahmud, Tushar Kanti Roy, Wang-Sang Lee

“…The use of a partial ground plane plays a vital role in making it an omni-directional antenna, and the existence of a rectangular parasitic element in the ground plane influences the improvement of gain and directivity of the antenna. …”
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Model of an automated control system for the positioning of radio signal transmission/reception devices by Bohdan Boriak, Alina Yanko, Oleksandr Laktionov

“…This research aimed to develop a model of an automated control system for the positioning of radio signal transmission/reception antennas, including directional antennas with a radiation pattern angle of 60-90 degrees, ensuring the minimization of azimuth positioning error. …”
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Target Q-Coverage Problem with Bounded Service Delay in Directional Sensor Networks by Deying Li, Hui Liu, Xianling Lu, Wenping Chen, Hongwei Du

“…By steering some sensors' directional antennas, our protocol could deal with the changes of network topology or monitoring tasks. …”
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Contention graph based concurrent scheduling algorithm in millimeter wave WPAN by Yibing WANG, Yong NIU, Weiguang DING, Hao WU

“…The directional antennas and beamforming techniques in millimeter wave (mmWave) bands are used to make concurrent transmission between multiple flows become possible.However,higher mutual interference may be caused by concurrent transmission.Therefore,when the time slots were limited and the number of data flows was large,how to schedule the concurrent flows efficiently was solved by proposed algorithm.The contention graph based spatial-time division multiple access (CB-STDMA) concurrent scheduling algorithm guaranteed the quality of service (QoS) of users,and aimed at maximizing the number of flows with their QoS requirements satisfied.It considered the interference between different flows,and a higher priority was given to the flow with fewer time slots requirement.Extensive simulations demonstrated that the proposed CB-STDMA algorithm increased the number of flows with their QoS requirements satisfied and the network throughput by 50% and 20% respectively compared with the existing algorithms.…”
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