Results 31 to 40 of about 777 (161)
Synthesis‐free backscatter directional modulation communication using Van‐Atta arrays
IET Microwaves, Antennas &Propagation, Volume 16, Issue 10, Page 654-659, August 2022., 2022 Abstract Backscatter communication, an emerging ultra‐low‐power wireless communication paradigm, has been studied as a promising solution for wireless communications in some Internet‐of‐Things (IoT) applications. The required ubiquitous data transmission in the IoT world is demanding information security.
Gaojian Huang +4 more
wiley +1 more source
A model for non‐ideal retrodirective channels in non‐line‐of‐sight geometry
Electronics Letters, Volume 58, Issue 10, Page 382-384, May 2022., 2022 Abstract Backscatter radio communication typically has less reliability than conventional radio links, hindering adaptation. Retrodirective arrays have been shown to enhance the link with gain and a recently‐observed resistance to small‐scale fading. However, the statistical advantages of retrodirective backscatter channels have only been theoretically
Mohammad Alhassoun
wiley +1 more source
Directional modulation‐enhanced retrodirective array [PDF]
Electronics Letters, 2015 Unlike the mathematical techniques adopted in classical cryptographic technology at higher protocol layers, it is shown that characteristics intrinsic to the physical layer can be exploited to secure useful information. It is shown that a retrodirective array can be made to operate more securely by incorporating directional modulation (DM) concepts ...
Ding, Y., Fusco, V.
openaire +3 more sources
A short‐time range‐angle‐decoupled beam pattern synthesis for frequency diverse arrays
IET Microwaves, Antennas &Propagation, Volume 15, Issue 8, Page 855-870, 1 July 2021., 2021 Abstract Frequency diverse array (FDA), by virtue of its range‐angle‐dependent beam pattern, has drawn a substantial attention in recent years. However, as far as the time‐variant range‐angle‐coupled beam pattern is concerned, such inherent flaw has become a bottleneck of its further development.
Can Cui +4 more
wiley +1 more source
International Journal of Antennas and Propagation, Volume 2021, Issue 1, 2021., 2021 This paper presents a compact, dual polarized bistatic (two closely spaced transmit and receive radiators) patch antenna with excellent interport isolation performance. The presented antenna system employs differential receive mode operation for the cancellation of self‐interference (SI) to achieve very high interport isolation for 2.4 GHz in‐band full
Haq Nawaz +4 more
wiley +1 more source
Establishing Multi-User MIMO Communications Automatically Using Retrodirective Arrays
IEEE Open Journal of the Communications Society, 2023 Communications in the mmWave and THz bands will be a key technological pillar for next-generation wireless networks. However, the increase in frequency results in an increase in path loss, which must be compensated for by using large antenna arrays. This
Davide Dardari +3 more
doaj +1 more source
Leakage Power Canceling Module with a Negative Capacitor for a Circulator’s Isolation [PDF]
Journal of Electromagnetic Engineering and Science, 2023 In this study, we developed a leakage power canceling module (LPCM) incorporating a negative capacitor (NCAP). The NCAP provided the circulator with a wide bandwidth, rendering it suitable for retrodirective short-range wireless power transfer ...
Tan-Binh Ngo +2 more
doaj +1 more source
Retrodirective-Assisted Secure Wireless Key Establishment [PDF]
IEEE Transactions on Communications, 2017 In this paper, a new type of architecture for secure wireless key establishment is proposed. A retrodirective array (RDA) that is configured to receive and re-transmit at different frequencies is utilized as a relay node. The RDA is able to respond in “real time,” reducing the required number of time slots to two. More importantly, in this architecture,
Yuan Ding 0001 +2 more
openaire +3 more sources
A retrodirective microstrip antenna array [PDF]
IEEE Transactions on Antennas and Propagation, 1998 A Van Atta retrodirective reflector was designed and developed, using an aperture-coupled microstrip antenna array. This reflector possesses the advantage of reflecting high fields to the source point over a wide range of incidence angles and, owing to the low cost and conformability of the structure, is suitable for applications in intelligent vehicle
null Shyh-Jong Chung, null Kai Chang
openaire +1 more source
Beam Pattern Optimization Method for Subarray‐Based Hybrid Beamforming Systems
Wireless Communications and Mobile Computing, Volume 2020, Issue 1, 2020., 2020 Massive multiple‐input multiple‐output (MIMO) systems operating at millimeter‐wave (mmWave) frequencies promise to satisfy the demand for higher data rates in mobile communication networks. A practical challenge that arises is the calibration in amplitude and phase of these massive MIMO systems, as the antenna elements are too densely packed to provide
Joerg Eisenbeis +7 more
wiley +1 more source