High Efficiency Bandwidth Electrically Small Antennas for Compact Wireless Communication Systems

Santos, Jean Paul; Fereidoony, Foad; Hedayati, Maziar; Wang, Yuanxun Ethan

doi:10.1109/mwsym.2019.8700725

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…To realize the communication among various systems that may not contain the available electrical volume to support the traditional transmission of required signals, Santos et al 129 proposed a new small electric antenna realized by direct antenna modulation (DAM). Handouf et al 130 studied the problem of activity energy optimization of UAV, introduced the constraint optimization method of activity cycle adjustment, finally improved the system coverage and rate performance.…”

Section: Large Dynamic Channelmentioning

confidence: 99%

A review on non-terrestrial wireless technologies for Smart City Internet of Things

Wang

Miao

et al. 2020

International Journal of Distributed Sensor Networks

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Smart City Internet of Things will become a fundamental infrastructure to support massive machine-type communications between the widely deployed sensors serving big cities. Since there exists many location constraints for the existing terrestrial Internet of Things, the non-terrestrial Internet of Things sheds light on breaking these limits. Therefore, this article conducts a comprehensive survey on non-terrestrial Internet of Things technologies for Smart City, which is an important complement to terrestrial Internet of Things. We first present the application scenarios of Internet of Things and point out where the existing terrestrial Internet of Things cannot work perfectly. Two non-terrestrial Internet of Things technical proposals are then introduced, namely satellite Internet of Things and unmanned aerial vehicle Internet of Things. However, the focuses of these non-terrestrial Internet of Things are distinct, that is, the major problems of satellite and unmanned aerial vehicle Internet of Things are the high dynamic nature of channel and high maneuverability of unmanned aerial vehicles, respectively. The key technologies for satellite and unmanned aerial vehicle Internet of Things are then reviewed separately. Both physical and non-physical layer technologies are surveyed for satellite Internet of Things, and the route planning is mainly investigated for the unmanned aerial vehicle Internet of Things. Finally, we draw a conclusion and give some potential research directions of non-terrestrial Internet of Things.

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Section: Large Dynamic Channelmentioning

confidence: 99%

A review on non-terrestrial wireless technologies for Smart City Internet of Things

Wang

Miao

et al. 2020

International Journal of Distributed Sensor Networks

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“…One of the methods that enable larger bandwidth transmission despite an ESA's inherent narrowband impedance is a technique known as direct antenna modulation (DAM) [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Onto a higher power handling for very high frequency direct antenna modulation

Santos

Bhakta

Fereidoony

et al. 2022

IET Circuits, Devices & Syst

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Antennas constrained to platforms that require miniaturisation, significantly smaller than the wavelength of the desired frequency, are inefficient radiators and limited to narrowband operations. To overcome these limitations, a technique called direct antenna modulation (DAM), is incorporated with electrically small antennas to enable transmission of high-bandwidth signals through narrowband antennas. DAM utilises switching circuitry to directly modulate the antenna at its corresponding peak energy moments all while being synchronised to the input signal, yet previous iterations were susceptible to low transmit powers due to limitations in the switching network's power handling capability and tremendous coupling between transistor ports that results in an ambiguous switching signal at the gate. A frequency shift keyed (FSK) DAM antenna topology is proposed, which is capable of high-power transmission through a geometrically symmetrical switching circuitry integrating pairs of complementary GaN transistors. The symmetry assists in removing coupling among transistor ports to effectively switch the transistors OFF and ON without regard to the input RF power. The authors' theoretical analysis agrees with our simulations and far-field measurements which show the FSK DAM antenna topology is capable of transmit powers up to −1 dBm given a 42 dBm of input RF power.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The first type is the ‘carrier synchronised’ approach, which requires switching the antenna at precise instants during the carrier cycle to store the energy on the antenna and accelerate transition between two tuned states [4, 8, 10]. However, this approach requires fast and precise switch timing that may not be possible when the carrier frequencies are in the ultra‐high‐frequency (UHF) range.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamically tuning the input impedance of a transmitting antenna to different carrier frequencies in accordance with the frequency shift keying signal has been proposed for wideband frequency shift keying (FSK) transmission using an electrically small narrowband antenna [1][2][3][4][5][6][7][8][9][10]. Broadly, two types of dynamically tuned FSK transmitter systems have been reported in the literature under various names, including direct antenna modulation (DAM), which will we use in this work.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transmission of a broadband FSK signal from a dynamically tuned narrowband antenna

Srivastava

Adams

2020

IET microw. antennas propagation

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A frequency reconfigurable patch antenna is dynamically tuned to transmit frequency-shift keying (FSK) signals over a range of frequencies much broader than the static impedance bandwidth of the antenna. Experiments are conducted for two binary FSK schemes having different carrier spacing. In both cases, dynamic tuning of the antenna is shown to increase the amplitude of the radiated signal by providing a better match than the static antenna. However, the average energy of the radiated bit at each carrier frequency decreases as the symbol rate increases beyond the 3 dB bandwidth of the antenna. Therefore, the bandwidth of the antenna is found to be a limiting factor for the maximum achievable data rate in this scheme. As an alternative to shorter bit durations, the authors show that a higher level FSK scheme using dynamic tuning is able to increase throughput beyond what is possible with a static antenna.

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High Efficiency Bandwidth Electrically Small Antennas for Compact Wireless Communication Systems

Cited by 8 publications

References 10 publications

A review on non-terrestrial wireless technologies for Smart City Internet of Things

A review on non-terrestrial wireless technologies for Smart City Internet of Things

Onto a higher power handling for very high frequency direct antenna modulation

Transmission of a broadband FSK signal from a dynamically tuned narrowband antenna

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