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公开(公告)号：US10515483B2
公开(公告)日：2019-12-24
申请号：US15780391
申请日：2016-12-01
Applicant: Drexel University
Inventor： Kapil R. Dandekar , Cem Sahin , Logan J. Henderson , Danh H. Nguyen , James J. Chacko , Xaime Rivas Rey
IPC: G06T19/00 , G01R29/10 , H04B17/336 , H04B17/345 , G06F3/0484 , H04L12/24
Abstract: Presenting a visualization of antenna radiation patterns may include sending a request to a server for up-to-date information regarding an antenna mode; receiving the request at the server and reading a register value for the antenna mode; responding, by the server, with updated antenna mode information; and overlaying antenna radiation patterns on an image based on the mode information.
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公开(公告)号：US10178124B2
公开(公告)日：2019-01-08
申请号：US15390134
申请日：2016-12-23
Applicant: Drexel University
Inventor： Prathaban Mookiah , Kapil R. Dandekar , John MacLaren Walsh , Rachel Greenstadt
Abstract: Channel based authentication schemes for intrusion detection that operates at the physical layer are described that apply the capabilities of a pattern reconfigurable antenna for improved performance. Performance gains are achieved by the schemes as a function of the number of antenna modes. The first scheme relies on a channel based fingerprint for differentiating between transmitters whereas another scheme poses the intruder detection problem as a generalized likelihood ratio (GLR) test problem that operates on the channel realizations corresponding to different modes present in a reconfigurable antenna. The benefits of these two schemes over single element antennas are demonstrated. General guidelines are provided on how to choose the different elements of the decision metric in order to realize better performance for physical layer based authentication schemes based on any diversity scheme.
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13.发明授权公开(公告)号：US10014585B2
公开(公告)日：2018-07-03
申请号：US15205551
申请日：2016-07-08
Applicant: Drexel University
Inventor： Damiano Patron , Kapil R. Dandekar
CPC classification number: H01Q13/28 , H01Q3/443 , H01Q15/0086
Abstract: Composite Right/Left Handed (CRLH) Leaky-Wave Antennas (LWAs) are a class of radiating elements characterized by an electronically steerable radiation pattern. The design is comprised of a cascade of CRLH unit-cells populated with varactor diodes. By varying the voltage across the varactor diodes, the antenna can steer its directional beam from broadside to backward and forward end-fire directions. A CRLH Leaky-Wave Antenna for the 2.4 GHz Wi-Fi band is miniaturized by etching a Complementary Split-Ring Resonator (CSRR) underneath each CRLH unit-cell. As opposed to conventional LWA designs, the LWA layout does not require thin interdigital capacitors, significantly reducing the PCB manufacturing constraints required to achieve size reduction. The resulting antenna enables CRLH LWAs to be used not only for wireless access points, but also potentially for mobile devices.
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14.发明申请公开(公告)号：US20180062841A1
公开(公告)日：2018-03-01
申请号：US15560507
申请日：2016-03-25
Applicant: Drexel University
Inventor： Cem SAHIN , Kapil R. Dandekar
CPC classification number: H04L9/0875 , H04L9/14 , H04L2209/80
Abstract: Symmetric keys are generated by an algorithm that uses the randomness from the wireless PHY layer to extract the keys. When used with reconfigurable antennas, the algorithm yields longer keys. By using the randomness from the wireless PHY layer, the algorithm solves the issue of secure information leakage to the wireless channel during key establishment phase. The algorithm also omits transmitting anything secure during this phase and prevents any intruder from obtaining information related to the key. This approach can automatically secure the communications over open wireless networks (those without authentication or encryption) or closed wireless networks using other methods of authentication.
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15.发明授权Transparent conformal polymer antennas for RFID and other wireless communications applications 有权用于RFID和其他无线通信应用的透明保形聚合物天线公开(公告)号：US09444134B2
公开(公告)日：2016-09-13
申请号：US14554828
申请日：2014-11-26
Applicant: Drexel University
Inventor： Adam K. Fontecchio , Kapil R. Dandekar , Timothy Kurzweg
CPC classification number: H01Q1/38 , G06K19/07773 , H01Q1/2208 , H01Q1/2225 , H01Q1/36 , H01Q9/065 , H01Q9/16
Abstract: An optically transparent conformal polymer antenna and a method for producing the antenna from optically transparent conductive polymers. The method includes selecting an antenna design; providing an optically transparent conductive polymer material capable of being printed using an ink-jet printer device; and printing layers of the polymer in the desired antenna design pattern onto a substrate. The surface tension of the polymer solution is adjusted to allow the material to pass through a printer head for printing on a flexible substrate. The material is modified to have a higher conductivity than regular conductive polymer materials so that a suitable antenna may be formed.
Abstract translation: 光学透明的保形聚合物天线和由光学透明导电聚合物制造天线的方法。 该方法包括选择天线设计; 提供能够使用喷墨打印机装置打印的光学透明导电聚合物材料; 并将所需的天线设计图案中的聚合物层印刷到基底上。 调节聚合物溶液的表面张力，以使材料通过打印头以在柔性基底上印刷。 该材料被修改为具有比常规导电聚合物材料更高的导电性，使得可以形成合适的天线。
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Patent Agency Ranking
16.发明申请公开(公告)号：US20150195047A1
公开(公告)日：2015-07-09
申请号：US14408807
申请日：2013-06-19
Applicant: Drexel University
Inventor： Rohit Bahl , Nikhil Gulati , Kapil R. Dandekar , Dwight L. Jaggard
CPC classification number: H04B15/00 , H04B7/0452 , H04B7/0456 , H04B7/0617 , H04L27/2601
Abstract: By using reconfigurable antenna based pattern diversity, an optimal channel can be realized in order to maximize the distance between two subspaces, thereby increasing sum-rate. The inventors show the benefits of pattern reconfigurability using real-world channels, measured in a MIMO-OFDM interference network. The results are quantified with two different reconfigurable antenna architectures. An additional 47% gain in choral distance and 45% gain in sum capacity were achieved by exploiting pattern diversity with IA. Due to optimal channel selection, the performance of IA can also be improved in a low SNR regime.
Abstract translation: 通过使用基于可重构天线的模式分集，可以实现最佳信道，以便最大化两个子空间之间的距离，从而增加总和速率。 本发明人使用在MIMO-OFDM干扰网络中测量的真实世界信道来显示模式可重构性的优点。 结果用两种不同的可重构天线架构进行量化。 通过利用IA的模式多样性，实现了合唱距离增加了47％的增长和总和能力的45％的增长。 由于最佳信道选择，IA的性能也可以在低SNR方案中得到改善。
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17.发明申请公开(公告)号：US20200244453A1
公开(公告)日：2020-07-30
申请号：US16851182
申请日：2020-04-17
Applicant: Drexel University
Inventor： Cem Sahin , Kapil R. Dandekar
Abstract: Symmetric keys are generated by an algorithm that uses the randomness from the wireless PHY layer to extract the keys. When used with reconfigurable antennas, the algorithm yields longer keys. By using the randomness from the wireless PITY layer, the algorithm solves the issue of secure information leakage to the wireless channel during key establishment phase. The algorithm also omits transmitting anything secure during this phase and prevents any intruder from obtaining information related to the key. This approach can automatically secure the communications over open wireless networks (those without authentication or encryption) or closed wireless networks using other methods of authentication.
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18.发明申请公开(公告)号：US20190268087A1
公开(公告)日：2019-08-29
申请号：US16284574
申请日：2019-02-25
Applicant: Drexel University
Inventor： Danh H. Nguyen , Marko Jacovic , Cem Sahin , Kapil R. Dandekar
IPC: H04K3/00
Abstract: A reactive jamming software defined radio (SDR) apparatus to target Frequency Hopping Spread-Spectrum (FHSS) signals includes a peripheral module for SDR processing; a reactive jamming hardware IP core that implements time-sensitive operations on a field programmable gate array (FGPA); and a host computer that implements non-time-critical operations, such as jammer configuration, logging, and strategy composition.
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19.发明授权公开(公告)号：US10038240B2
公开(公告)日：2018-07-31
申请号：US14653076
申请日：2013-12-20
Applicant: Drexel University , Adant Technologies, Inc.
Inventor： Damiano Patron , Kapil R. Dandekar , Daniele Piazza
Abstract: A planar reconfigurable antenna that is capable of generating omnidirectional and directional radiation patterns over a wide frequency band or over multiple frequency bands includes a substrate, one or more pairs of conductive elements on at least one side of the substrate, a common RF feed point, and respective switches that selectively connects one or all of the conductive elements to the common RF feed point. An omni-directional radiation pattern is generated when all of the conductive elements are connected to the common RF feed point, while a directional radiation pattern is generated when only a pair of conductive elements on opposite sides of the substrate are connected to the common RF feed point. In the directional radiation mode, the conductive elements that are not connected to the common RF feed point act as a reflector for other conductive elements that are connected to the common RF feed point.
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20.发明申请公开(公告)号：US20170180420A1
公开(公告)日：2017-06-22
申请号：US15390134
申请日：2016-12-23
Applicant: Drexel University
Inventor： Prathaban Mookiah , Kapil R. Dandekar , John MacLaren Walsh , Rachel Greenstadt
CPC classification number: H04L63/1483 , H04L63/08 , H04L63/1416 , H04W12/06 , H04W12/12
Abstract: Channel based authentication schemes for intrusion detection that operates at the physical layer are described that apply the capabilities of a pattern reconfigurable antenna for improved performance. Performance gains are achieved by the schemes as a function of the number of antenna modes. The first scheme relies on a channel based fingerprint for differentiating between transmitters whereas another scheme poses the intruder detection problem as a generalized likelihood ratio (GLR) test problem that operates on the channel realizations corresponding to different modes present in a reconfigurable antenna. The benefits of these two schemes over single element antennas are demonstrated. General guidelines are provided on how to choose the different elements of the decision metric in order to realize better performance for physical layer based authentication schemes based on any diversity scheme.
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