Concept for a 16-QAM RF Transmitter on Flexible Substrate using a Graphene Technology

Fan, Chao; Wei, Muh‐Dey; Gjurovski, Peco; Saeed, Mohamed; Hamed, A.; Negra, Renato; Uzlu, Burkay; Wang, Zhenxing

doi:10.1109/icecs46596.2019.8965174

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…However, it has been noted that the variation of both the amplitude and phase is important to the microwave community for many applications. In quadrature amplitude modulation schemes, the specific variation of the amplitude and phase of the signal is required, in order to complete a set of points on a constellation diagram, each representing a specific amplitude and phase [ 12 , 13 ]. In many beam-forming networks, a specific amplitude and phase is required to excite the individual elements of the network [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Amplitude-Phase Variation in a Graphene-Based Microstrip Line

2022

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A graphene-based transmission line with independent amplitude and phase variation capability is proposed. Variation of graphene’s tunable conductivity by an applied DC bias is exploited in designing an attenuator and a phase shifter. The attenuator and phase shifter are separated from each other by an interdigitated capacitor to ensure independent control of each section through an applied DC bias. The phase shifter is designed by optimizing lengths of a tapered line and an open stub for a maximum variation of input reactance with a change in graphene resistance. The attenuator is designed by two pairs of grounded vias connected to the transmission line through graphene. Variation of graphene resistance controls the signal passing through graphene pads into the ground causing attenuation. An independent variation of 5 dB of attenuation is measured along with an independent phase variation of 23 degrees in the frequency range of 4 GHz to 4.5 GHz.

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Section: Introductionmentioning

confidence: 99%

Amplitude-Phase Variation in a Graphene-Based Microstrip Line

2022

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“…Recently, a variety of flexible and wearable electronic devices have appeared on the market. Particularly for the development of microwave technology, flexible radio frequency (RF) devices have attracted growing attention due to their flexibility, light weight, low power consumption and good biocompatibility, and have been applied in wireless communication [1][2][3][4][5][6][7], biomedicine [8][9][10][11], sensing [12,13] and military [14] fields. Flexible RF devices are obtained by improving the physical material or structure of traditional RF devices, so that they can possess the excellent electrical characteristics of traditional RF devices under deformation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microcracks on Silver/Polydimethylsiloxane-Based Flexible Microstrip Transmission Lines

Ding

Yan

et al. 2020

Applied Sciences

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Microcrack is commonly seen as a defect in materials that affects the performance of flexible radio frequency (RF) devices. Here, we investigate the influence of microcracks on the RF characteristics of flexible microstrip by stretching flexible microstrip that is based on polydimethylsiloxane (PDMS) substrate and an Ag microparticles/PDMS (AgMP/PDMS) composite conductor. The RF characteristics of the microstrip were monitored with a variety of tensile displacements. An equivalent circuit model of the microstrip with microcracks was proposed to reveal the mechanisms. The fitting results matched the actual measurement well. In addition, the morphology of the microcracks was characterized by SEM and the direct-current (DC) resistance was monitored. The results show that the changes in equivalent circuit element parameters (R, L, C) are due to the change in the conductive pathways, which affect the transmission and reflection of the RF signals.

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Concept for a 16-QAM RF Transmitter on Flexible Substrate using a Graphene Technology

Cited by 2 publications

References 9 publications

Amplitude-Phase Variation in a Graphene-Based Microstrip Line

Amplitude-Phase Variation in a Graphene-Based Microstrip Line

Influence of Microcracks on Silver/Polydimethylsiloxane-Based Flexible Microstrip Transmission Lines

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