“…These will affect the energy harvesting performance of the antenna. 37,38 The fabric covering factor and its relationship with the printing accuracy is shown in Figure 7. It is reported that, with the increase of fabric holes, the line width deviation of printed conductors gradually decreases.…”
Section: Resultsmentioning
confidence: 99%
“…These will affect the energy harvesting performance of the antenna. 37,38 Figure 6.Fabric characteristics and its effect on the printing accuracy: (a) Surface roughness of the fabric and its printed conductor and (b) wetting time of the fabric.Figure 7.The fabric covering factor and its relationship with the printing accuracy.…”
Textile materials are the ideal substrate of the antenna of eco-friendly wireless radio frequency (RF) energy harvesting technology for sustainable battery-free operation of wearable electronic devices, while few of the work published have been focused on the effect of textile properties on the energy harvesting performance. This work will clarify the effect of typical fabric surface structures on the energy harvesting performance of Radio Frequency Identification (RFID) antenna. The antennas were screen-printed onto three different weave structures, and performance for the different fabric-based antennas were studied. The results showed that the antenna printed on plain fabric, which has the smallest porosity and lower surface roughness, was able to achieve a maximum transmission distance of 110 cm and output voltage of 3.003 mV at 69 cm. Consequently, in order to improve the energy harvesting performance of antenna, the smooth and compact fabric surface is more beneficial to highly efficient energy harvesting.
“…These will affect the energy harvesting performance of the antenna. 37,38 The fabric covering factor and its relationship with the printing accuracy is shown in Figure 7. It is reported that, with the increase of fabric holes, the line width deviation of printed conductors gradually decreases.…”
Section: Resultsmentioning
confidence: 99%
“…These will affect the energy harvesting performance of the antenna. 37,38 Figure 6.Fabric characteristics and its effect on the printing accuracy: (a) Surface roughness of the fabric and its printed conductor and (b) wetting time of the fabric.Figure 7.The fabric covering factor and its relationship with the printing accuracy.…”
Textile materials are the ideal substrate of the antenna of eco-friendly wireless radio frequency (RF) energy harvesting technology for sustainable battery-free operation of wearable electronic devices, while few of the work published have been focused on the effect of textile properties on the energy harvesting performance. This work will clarify the effect of typical fabric surface structures on the energy harvesting performance of Radio Frequency Identification (RFID) antenna. The antennas were screen-printed onto three different weave structures, and performance for the different fabric-based antennas were studied. The results showed that the antenna printed on plain fabric, which has the smallest porosity and lower surface roughness, was able to achieve a maximum transmission distance of 110 cm and output voltage of 3.003 mV at 69 cm. Consequently, in order to improve the energy harvesting performance of antenna, the smooth and compact fabric surface is more beneficial to highly efficient energy harvesting.
“…These conductive traces printed on flexible substrates offer many potential applications in the area of wearable electronics, ranging from search and rescue operations, to health and physiological monitoring. Lim Y. Y. et al investigated the effect of the pasting property on the dc conductivity of printed interconnects on a substrate, as well as the consequent RF performance up to the frequency of 30 GHz [13].…”
This paper presents a low-loss, high-transmission, broadside-coupled, transverse, reciprocal, two-port, and nature-inspired Ka-band transition design to move the electromagnetic energy of a rectangular waveguide (RWG) to the microstrip (MS) line. The proposed transition is simple in structure, with an excellent insertion loss, S12/S21, (IL) near −0.40 dB and return loss, S11/S22, of <−21 dB, while the VSWR value is very close to one. Thus, this transition is an outstanding candidate for MIC/MMIC-based millimeter wave, military, and RADAR applications, as well as in wireless and satellite communications as a compatible connector. This transition also provides a bandwidth of 21.50 GHz (23.52–45.0 GHz) for the abovementioned microwave applications, at a <−10 dB return loss (RL). The proposed transition model also exhibits a −15 dB absolute bandwidth of 27.06–23.44 GHz, with an insertion loss < −0.60 dB. Due to a return loss of <−15 dB over an ultra-wide bandwidth, the proposed transition is not only a good candidate for full Ka-band (26–40 GHz) applications but also covers applications for K-band from 23.74 GHz to 26.0 GHz, Q-band applications from 33.0 to 45.0 GHz, and U-band applications from 40.0 GHz to 45 GHz, with approximately 97% power transmission between the transmission lines and only 3% power reflections. The impedance matching at the designed frequency between the RWG and MS line is achieved by flaring one end of the MS line inside the RWG in a fishtail shape, without the need for a quarter-wave/tapered/exponential/Binomial, or multi-section Chebyshev transformer. The main goal of this research was to design a multi-section impedance-transformer-free, simple, and easy-to-fabricate MS line, to share electromagnetic (EM) energy between an MS line and RWG in 30 GHz satellite applications and 30 GHz high-frequency applications, for interconnects screen printed on an organic substrate for flexible, wearable, textile conformal antennas. This work also presents an exact RLC electrical equivalence model of the MS line (fishtail) to RWG transition at 30 GHz. The novelty of this work is that the proposed transition can be used for four microwave bands of electromagnetic energy transmission, with extremely low reflection, and with a compact, simple-design MS line, and simple RWG.
Printed tracks/patterns with low conductivity are one of the challenges for printed electronics application because they exist in almost every electrical device. All printing methods are applied to manufacture conductive tracks, even high-resolution conductive lines and patterns. These printed tracks can be further given new functions, such as stretchability and self-healing properties, and can also be directly applied to circuits, antennas and flexible heaters. In this chapter, the application of conductive tracks, electrical circuits, electrodes and conductive patterns are demonstrated. Printing methods are also used to fabricate stretchable conductors, self-healing conductors and flexible heaters, exhibiting good electrical properties.
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