A Miniaturized Microfluidically Reconfigurable Coplanar Waveguide Bandpass Filter With Maximum Power Handling of 10 Watts

作者：Saghati Alireza Pourghorban^*; Batra Jaskirat Singh; Kameoka Jun; Entesari Kamran

来源：IEEE Transactions on Microwave Theory and Techniques, 2015, 63(8): 2515-2525.

DOI：10.1109/TMTT.2015.2446477

• Frequency reconfigurable filter
• Galinstan
• high-power microwave
• liquid metal
• microfluidic tuning

In this paper, a microfluidically reconfigurable coplanar waveguide (CPW) filter is presented with a tuning range of similar to 1.6:1 and four different states. The passband frequency of the filter is changed based on employing the capacitive loading effect of a liquid metal placed on top of each CPW resonator using three parallel micro-channels. In addition, because of the loading effect of the metal bridges, miniaturization by a factor of 40% is achieved. The filter is digitally tuned from 3.4 to 5.5 GHz with an insertion loss of less than 5.0 dB and a relative bandwidth of 5 +/- 0.35%. The RF power-handling capability of the filter is characterized using a customized measurement setup. It is observed that the filter can be used for input RF powers of up to similar to 20 W for short-duration excitation conditions and 10 W for high-average-power excitation conditions. The filter is realized using common printed circuit board technology and a polydimethylsiloxane structure. Design methodology, simulation, and measurement results of the filter prototype are presented.

• 出版日期2015-8