Analysis of a Direct Antenna Modulation Transmitter for Wideband OOK With a Narrowband Antenna

Srivastava, S. C.; Adams, Jack A.

doi:10.1109/tap.2017.2734063

Cited by 18 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with [29], the use of diodes with lower series resistance has improved the peak antenna efficiency from 10% to 46%. However, efficiency results are not given in [20], [27]. The symbol rate demonstrated in this paper is of a similar order to, but lower than, that achieved in [20], [27], though the same as [29].…”

Section: B Measurement Of System In Awgncontrasting

confidence: 53%

“…However, efficiency results are not given in [20], [27]. The symbol rate demonstrated in this paper is of a similar order to, but lower than, that achieved in [20], [27], though the same as [29]. Note, however, that these values are those demonstrated by practical testbeds, which are not necessarily the upper limits of each technique's operation.…”

Section: B Measurement Of System In Awgnmentioning

confidence: 50%

“…By using four FSS layers rather than three, this work has increased the modulation order achievable from QPSK to 8-PSK. Compared with other DAM approaches, as shown in Table IV, this is equivalent to the modulation orders achieved by [27] and an advance over [20]. However, this comes at the cost of a greater physical depth than all the other approaches, reaching 1.71λ.…”

Section: B Measurement Of System In Awgnmentioning

confidence: 93%

“…It should also be noted that [27] requires a plane wave feed to the metasurface, which is not included in the dimensions given here. The solution in [20] is the most compact, at nearly a quarter of the aperture area of the DAM unit in this paper.…”

Section: B Measurement Of System In Awgnmentioning

confidence: 97%

“…This concept was further developed by using PIN diodes, and showing how these could be used to allow a patch antenna to transmit signals more broadband than its own bandwidth [18], [19]. A similar approach for ultra-wideband on-off keying (OOK) with a patch antenna is described in [20].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Direct Antenna Modulation for High-Order Phase Shift Keying

Henthorn

Ford

O’Farrell

2020

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

An antenna capable of directly phase modulating a radio frequency carrier is discussed, designed, and measured as both an antenna and a modulator. Access point densification for the Internet of Things will be expensive in part due to the cost and inefficiency of amplifying waveforms with large peak-to-average power ratios for downlink transmission. Directly modulating at the antenna means only a carrier wave has to be amplified, reducing the cost of densification. Here, reconfigurable frequency selective surfaces are suggested as phase modulators. The design process for producing a phase modulating antenna is detailed, and a prototype is fabricated that is capable of up to 8-PSK modulation with 5.3dB variation in constellation points and a peak gain of 2.3dB. When implemented in an end-to-end communications system, the antenna exhibits only 1.5dB drop in performance compared with instrument grade modulation in an AWGN channel.

show abstract

Section: B Measurement Of System In Awgncontrasting

confidence: 53%

Section: B Measurement Of System In Awgnmentioning

confidence: 50%

Section: B Measurement Of System In Awgnmentioning

confidence: 93%

Section: B Measurement Of System In Awgnmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Direct Antenna Modulation for High-Order Phase Shift Keying

Henthorn

Ford

O’Farrell

2020

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

Reconfigurable CRLH‐inspired antenna based on Hilbert curve EBG structure for modern wireless systems

Ismail

Elwi

Salim

2023

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This paper presents a novel antenna design with an enhanced gain-bandwidth product for modern communication networks, including 5G systems. The design is consistent with 17 unit cells of a composite right/left-hand (CRLH) structure with an electromagnetic band gap of Hilbert inclusions. Therefore, the resulting design occupies an area of 40 × 200 mm 2 of a Taconic RF-43 substrate. The maximum antenna gain is 16 dBi at 5.5 GHz, which is very applicable for long-range communication systems. Nevertheless, the antenna performance is controlled with optical switches of light-dependent resistors (LDR) technology. Therefore, the antenna performance is tested with different switching seniors to investigate the possibility of reconfiguration scenarios at various frequency bands. However, the antenna gain is highly affected by changing LDR switching status; for example, at 5.5 GHz, the antenna gain is varied between 7 and 16 dBi. Thus, the proposed antenna is an excellent candidate for direct amplitude modulation. Finally, the antenna simulation results and measurements agree very well with each other.

show abstract

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

Santos

Bhakta

Fereidoony

et al. 2022

IET Circuits, Devices & Syst

View full text Add to dashboard Cite

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.

show abstract

Analysis of a Direct Antenna Modulation Transmitter for Wideband OOK With a Narrowband Antenna

Cited by 18 publications

References 13 publications

Direct Antenna Modulation for High-Order Phase Shift Keying

Direct Antenna Modulation for High-Order Phase Shift Keying

Reconfigurable CRLH‐inspired antenna based on Hilbert curve EBG structure for modern wireless systems

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

Contact Info

Product

Resources

About