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Papers 1990
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Andrea Francesco Morabito15
Estimated H-index: 15
(Mediterranea University of Reggio Calabria),
Loreto Di Donato8
Estimated H-index: 8
(University of Catania),
Tommaso Isernia32
Estimated H-index: 32
(Mediterranea University of Reggio Calabria)
In this article, we propose a method based on the aperture antennas theory to understand the limitations of orbital angular momentum (OAM) antennas in far-field links. Additional insight is also given by analyzing the properties of the operators relating source and farfield distributions for a given order of the vortex and emphasizing additional drawbacks. The degrees-of-freedom (DoF) of the fields associated with the different orders of the vortices are also discussed.
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Agnese Mazzinghi6
Estimated H-index: 6
(University of Florence),
Angelo Freni14
Estimated H-index: 14
(University of Florence),
Alessandro Agostini ... more
Preventing accidents at level crossings is a global-size problem. Despite all the European railways having planned to replace them with underpasses or overpasses, it is expected that, for the next 20 years, there will still be a strong need for additional automatic protection to be achieved with, for example, a radar detection system. In this article, we present and compare the different antenna solutions that have been designed and manufactured for a 77-GHz level-crossing monitoring frequency-m...
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Marshed Mohamed1
Estimated H-index: 1
(Norwegian University of Science and Technology),
Michael Cheffena10
Estimated H-index: 10
(Norwegian University of Science and Technology),
Fernando Perez Fontan8
Estimated H-index: 8
(University of Vigo)
... more
The use of indoor wireless devices has substantially increased in recent years. This escalation is due to the expansion of traditional communication devices, such as mobile phones and laptop computers, to less traditional ones, such as wirelessly communicating sensor nodes present in smart homes, office buildings, and industrial environments. The placement of these nodes varies considerably from one application to the next, but, when the nodes are placed indoors and within the vicinity of human ...
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Qiang Xu (University of California, Los Angeles), Mathew M. Biedka1
Estimated H-index: 1
(University of California, Los Angeles),
Yuanxun Ethan Wang10
Estimated H-index: 10
(University of California, Los Angeles)
In full-duplex communication systems, reflections of transmitted waves as a result of the antenna mismatch may leak into the receiver and create strong on-site interferences. Such reflections cannot be suppressed by conventional frontend isolation techniques even with ideal circulators. Indented antenna arrays are thus proposed to destructively combine the reflection from each antenna element and prevent them from negatively impacting the receiver sensitivity. The essential idea is to break the ...
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Toan K. Vo Dai1
Estimated H-index: 1
(The Catholic University of America),
Anh Thai (The Catholic University of America), Tuan Phan1
Estimated H-index: 1
(The Catholic University of America)
... more
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Ehab A. Etellisi2
Estimated H-index: 2
(University of Colorado Boulder),
Mohamed A. Elmansouri5
Estimated H-index: 5
(University of Colorado Boulder),
Dejan S. Filipovic20
Estimated H-index: 20
(University of Colorado Boulder)
Broadband copolarized monostatic circular-antenna arrays based on mode orthogonality principles are presented for in-band full-duplex (FD) applications. The simultaneous excitation of circular phase modes in a circular array with four elements provides ideally infinite isolation. However, once the realistic beamformer network (BFN) is used, the isolation between the transmitter (Tx) and receiver (Rx) is reduced and becomes bound by the internal leakages. To mitigate the undesired leakages, two p...
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Carla Di Paola (Aalborg University), Anders Karstensen2
Estimated H-index: 2
(Aalborg University),
Wei Fan8
Estimated H-index: 8
(Aalborg University)
... more
This article compares the over-the-air (OTA) performance of tradit ional voice service and voice-over LTE (VoLTE). We present the results of the OTA measurements of the antenna performance of 22 mobile phones commonly used over the last two years. VoLTE is a feature included in LTE that allows voice service to be delivered as data flows. Traditional studies on LTE include only data service and, therefore, OTA for data service, which is measured with the phone held in the browsing position only b...
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Andrea Michel8
Estimated H-index: 8
(University of Pisa),
Paolo Nepa23
Estimated H-index: 23
(University of Pisa),
Xianming Qing32
Estimated H-index: 32
... more
Radio-frequency identification (RFID) is being widely used in supply chain and logistics applications for wireless identification and the tracking and tracing of goods, with excellent performance for the long-range interrogation of tagged pallets and cases (up to 4-6 m, with passive tags). Item-level tagging (ILT) has also received much attention, especially in the pharmaceutical and retail industries. Low-frequency (125-134 KHz) and high-frequency (HF) (13.56 MHz) RFID systems have traditionall...
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Kwok Kan So11
Estimated H-index: 11
(City University of Hong Kong),
Kwai-Man Luk48
Estimated H-index: 48
(City University of Hong Kong),
Chi Hou Chan29
Estimated H-index: 29
(City University of Hong Kong)
Patch antennas are widely applied in modern wireless communication systems. However, conventional patch antennas have the disadvantage of narrow bandwidth and are not suitable for Ku-band satellite broadcast reception. Many researchers have proposed various techniques to enhance the bandwidth of probe-fed patch antennas, e.g., employing thick substrate [1], adding parasitic patches either in the same layer (coplanar) [2]-[3] or in another layer (stacked) [4], and using capacitor-loaded patches [...
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