International Journal of Rf and Microwave Computer-aided Engineering, Mar 30, 2021
This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) print... more This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) printed Ultem 9085 substrate and a 3D printed body‐centered cubic lattice cell structure (LCS) superstrate made of Verowhite Plus. The radiating patch was fabricated by manual screen‐printing method using commercially available silver pastes. The superstrate was affixed to the top of the patch to mitigate shock‐induced damage to the patch. The antenna, which operates close to 5 GHz (an alternative frequency band to 2.4 GHz for data link applications) was designed as a test platform to quantify the effects of a printed superstrate on the resonant frequency and bandwidth. The addition of the superstrate shifted the resonant frequency by 0.1 GHz; and while this is not insignificant it still provides a promising strategy for adding vibration mitigation to radio frequency (RF) structures. Further, it was used to assess a less computationally expensive scheme for modeling of RF antennas involving cellular structures. In this scheme, the LCS superstrate is treated as a solid with dielectric properties that resemble that of a porous medium. Comparisons of measured and simulated S11 before and after adding the LCS superstrate revealed that the scheme yields results that are in good agreement with the experiment. Results from this work can provide guidance in the fabrication of low‐cost fully printed patch antennas with LCS superstrate for specific frequency application.
Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetti... more Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetting parameters are required to be optimized to generate desired drop in term of volume and speed. In this research paper, different jetting device parameters such as waveform dwell voltage and frequency are tested at different platform velocity using fly mode printing with burst to print lines on semicrystalline polyether ether ketone (PEEK) substrate. The ink used in this case is high conductive nanosilver supplied by UT Dots, Inc. (UTDAg) to investigate its feasibility to be printed on PEEK. Initially, the printer is used to print six lines directly on the substrate at same velocity 20 m m / s and different drop spacing for printing along the line. Then, three lines with drop spacing of 80 μ m is printed at stage velocity 30 m m / s , 40 m m / s a n d 50 m m / s to investigate effective frequency for droplet generation and obtain even and smooth line. Physical and adhesion characteristics of the printed lines are performed by optical microscopy, scanning electron microscopy, surface profilometry, and soak tests. It is observed that for 60 μ m nozzle and a dwell voltage of 24 V, drop spacing of 80 μ m and stage velocity of 50 m m / s result in uniform line. Finally, the resistance of optimized line is measured.
The performance of printed electronics strongly depends on printing parameters and printing resol... more The performance of printed electronics strongly depends on printing parameters and printing resolution.
International Journal of RF and Microwave Computer-Aided Engineering, 2021
This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) print... more This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) printed Ultem 9085 substrate and a 3D printed body‐centered cubic lattice cell structure (LCS) superstrate made of Verowhite Plus. The radiating patch was fabricated by manual screen‐printing method using commercially available silver pastes. The superstrate was affixed to the top of the patch to mitigate shock‐induced damage to the patch. The antenna, which operates close to 5 GHz (an alternative frequency band to 2.4 GHz for data link applications) was designed as a test platform to quantify the effects of a printed superstrate on the resonant frequency and bandwidth. The addition of the superstrate shifted the resonant frequency by 0.1 GHz; and while this is not insignificant it still provides a promising strategy for adding vibration mitigation to radio frequency (RF) structures. Further, it was used to assess a less computationally expensive scheme for modeling of RF antennas involving cellular structures. In this scheme, the LCS superstrate is treated as a solid with dielectric properties that resemble that of a porous medium. Comparisons of measured and simulated S11 before and after adding the LCS superstrate revealed that the scheme yields results that are in good agreement with the experiment. Results from this work can provide guidance in the fabrication of low‐cost fully printed patch antennas with LCS superstrate for specific frequency application.
Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetti... more Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetting parameters are required to be optimized to generate desired drop in term of volume and speed. In this research paper, different jetting device parameters such as waveform dwell voltage and frequency are tested at different platform velocity using fly mode printing with burst to print lines on semicrystalline polyether ether ketone (PEEK) substrate. The ink used in this case is high conductive nanosilver supplied by UT Dots, Inc. (UTDAg) to investigate its feasibility to be printed on PEEK. Initially, the printer is used to print six lines directly on the substrate at same velocity 20 m m / s and different drop spacing for printing along the line. Then, three lines with drop spacing of 80 μ m is printed at stage velocity 30 m m / s , 40 m m / s a n d 50 m m / s to investigate effective frequency for droplet generation and obtain even and smooth line. Physical and adhesion characteristics of the printed lines are performed by optical microscopy, scanning electron microscopy, surface profilometry, and soak tests. It is observed that for 60 μ m nozzle and a dwell voltage of 24 V, drop spacing of 80 μ m and stage velocity of 50 m m / s result in uniform line. Finally, the resistance of optimized line is measured.
International Journal of Rf and Microwave Computer-aided Engineering, Mar 30, 2021
This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) print... more This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) printed Ultem 9085 substrate and a 3D printed body‐centered cubic lattice cell structure (LCS) superstrate made of Verowhite Plus. The radiating patch was fabricated by manual screen‐printing method using commercially available silver pastes. The superstrate was affixed to the top of the patch to mitigate shock‐induced damage to the patch. The antenna, which operates close to 5 GHz (an alternative frequency band to 2.4 GHz for data link applications) was designed as a test platform to quantify the effects of a printed superstrate on the resonant frequency and bandwidth. The addition of the superstrate shifted the resonant frequency by 0.1 GHz; and while this is not insignificant it still provides a promising strategy for adding vibration mitigation to radio frequency (RF) structures. Further, it was used to assess a less computationally expensive scheme for modeling of RF antennas involving cellular structures. In this scheme, the LCS superstrate is treated as a solid with dielectric properties that resemble that of a porous medium. Comparisons of measured and simulated S11 before and after adding the LCS superstrate revealed that the scheme yields results that are in good agreement with the experiment. Results from this work can provide guidance in the fabrication of low‐cost fully printed patch antennas with LCS superstrate for specific frequency application.
Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetti... more Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetting parameters are required to be optimized to generate desired drop in term of volume and speed. In this research paper, different jetting device parameters such as waveform dwell voltage and frequency are tested at different platform velocity using fly mode printing with burst to print lines on semicrystalline polyether ether ketone (PEEK) substrate. The ink used in this case is high conductive nanosilver supplied by UT Dots, Inc. (UTDAg) to investigate its feasibility to be printed on PEEK. Initially, the printer is used to print six lines directly on the substrate at same velocity 20 m m / s and different drop spacing for printing along the line. Then, three lines with drop spacing of 80 μ m is printed at stage velocity 30 m m / s , 40 m m / s a n d 50 m m / s to investigate effective frequency for droplet generation and obtain even and smooth line. Physical and adhesion characteristics of the printed lines are performed by optical microscopy, scanning electron microscopy, surface profilometry, and soak tests. It is observed that for 60 μ m nozzle and a dwell voltage of 24 V, drop spacing of 80 μ m and stage velocity of 50 m m / s result in uniform line. Finally, the resistance of optimized line is measured.
The performance of printed electronics strongly depends on printing parameters and printing resol... more The performance of printed electronics strongly depends on printing parameters and printing resolution.
International Journal of RF and Microwave Computer-Aided Engineering, 2021
This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) print... more This work demonstrates a fully printed patch antenna consisting of a three‐dimensional (3D) printed Ultem 9085 substrate and a 3D printed body‐centered cubic lattice cell structure (LCS) superstrate made of Verowhite Plus. The radiating patch was fabricated by manual screen‐printing method using commercially available silver pastes. The superstrate was affixed to the top of the patch to mitigate shock‐induced damage to the patch. The antenna, which operates close to 5 GHz (an alternative frequency band to 2.4 GHz for data link applications) was designed as a test platform to quantify the effects of a printed superstrate on the resonant frequency and bandwidth. The addition of the superstrate shifted the resonant frequency by 0.1 GHz; and while this is not insignificant it still provides a promising strategy for adding vibration mitigation to radio frequency (RF) structures. Further, it was used to assess a less computationally expensive scheme for modeling of RF antennas involving cellular structures. In this scheme, the LCS superstrate is treated as a solid with dielectric properties that resemble that of a porous medium. Comparisons of measured and simulated S11 before and after adding the LCS superstrate revealed that the scheme yields results that are in good agreement with the experiment. Results from this work can provide guidance in the fabrication of low‐cost fully printed patch antennas with LCS superstrate for specific frequency application.
Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetti... more Abstract For uniform and ideal inkjet printing of liquid phase materials on substrates, the jetting parameters are required to be optimized to generate desired drop in term of volume and speed. In this research paper, different jetting device parameters such as waveform dwell voltage and frequency are tested at different platform velocity using fly mode printing with burst to print lines on semicrystalline polyether ether ketone (PEEK) substrate. The ink used in this case is high conductive nanosilver supplied by UT Dots, Inc. (UTDAg) to investigate its feasibility to be printed on PEEK. Initially, the printer is used to print six lines directly on the substrate at same velocity 20 m m / s and different drop spacing for printing along the line. Then, three lines with drop spacing of 80 μ m is printed at stage velocity 30 m m / s , 40 m m / s a n d 50 m m / s to investigate effective frequency for droplet generation and obtain even and smooth line. Physical and adhesion characteristics of the printed lines are performed by optical microscopy, scanning electron microscopy, surface profilometry, and soak tests. It is observed that for 60 μ m nozzle and a dwell voltage of 24 V, drop spacing of 80 μ m and stage velocity of 50 m m / s result in uniform line. Finally, the resistance of optimized line is measured.
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