Multilayer Inkjet Printing of Millimeter-Wave Proximity-Fed Patch Arrays on Flexible Substrates

Inkjet‐Printed Smart Skins and Wirelessly‐Powered Sensors for Wearable Applications

“…One simple application of this fabrication technology is shown in the demonstration of an inkjet-printed millimeter-wave, proximity-coupled patch antenna array [11]. This antenna utilizes 1 mm [11]. Reproduced with permission of IEEE.…”

24‐GHz Patch antenna array on cellulose‐based materials for green wireless internet applications

“…This is because its size is constrained to be within a quarter to a half of wavelength for an acceptable radiation efficiency. From this observation, one can simply infer that microwave antennas cannot be integrated directly on silicon, but must be implemented on a different substrate such as, for example, a flexible or conformal printed circuit board (PCB) [15][16][17]. Thus, in future wireless terminals and sensors, the mass and the volume of the antenna will be very significant compared with that of the SoC (i.e.…”

Fully inkjet-printed multilayer microstrip patch antenna for Ku-band applications

“…The new fabrication method can create complex electronic structures with low cost, fast and environmentally preferable process. It has been already reported that multilayer passive RF components, microfluidic structures, and high-gain millimeterwave antenna arrays can be achieved by utilizing conductive silver nanoparticle-based ink and dielectric polymer-based ink [1]- [3]. However, fully inkjet-printed RF devices, where the metallization layers and microwave substrate are printed in a single integrated process have yet to be demonstrated.…”

“…However, there still be the room for improvement to achieve better parameters as off the shelf circuit components only with inkjet printing technology. In the past research of printed antenna, commercially used circuit board and paper are utilized as substrate [3]. On the other hand, the first fully additive, multilayer patch antenna including both circuit pattern and substrate is printed on 5cm by 7cm base glass substrate in this paper.…”

“…The RF ground plane is printed directly on glass. On top of it, about 40um thick dielectric substrate is printed using a customized dielectric ink which can print layers over 20 times thicker than previously demonstrated dielectric inks [3]. Finally on top of the printed SU-8 substrate the microstrip fed patch antenna is printed with conductive silver nano-particle ink.…”