An Implementation Method of Transmission Line for High Frequency Band Using Inkjet Printing Technique

Abstract

In this paper, we design and fabricate transmission line resonators to verify the applicability of transmission line for high frequency band using inkjet printing technology. The implementation of the transmission line using inkjet print technology has an advantage that it can be implemented only in two steps, printing process for patterned lines and sintering process, compared with the conventional PCB manufacturing process. However, the transmission line required for the high frequency is not only connected to the signal line, but also a small loss of the line is an important factor. Thus, ten resonator samples are fabricated using the inkjet printing technique having the advantage of a simple manufacturing process, and the electrical characteristics were verified. The gap between the 50 ohm line and the transmission line for measurement was 0.3mm, and the line width was implemented as from 250 um to 700 um. The ink used in the fabrication is a silver nano paste ink of NPK with a viscosity of 5000 to 20000 cPs, and is sintered for 5 minutes on a 350 0C hot plate. Measurement results of fabricated samples using Network Analyzer showed that all 10 resonators had Q-factor of 70 to 90 around 2.7GHz. This is a very important result that shows the inkjet printing development technology can be applied to the implementation of the high frequency circuit in the future.