Abstract
The detection of multiple fluids using a single chip has been attracting attention recently. A TM02 quarter-mode substrate-integrated waveguide resonator designed at 5.81 GHz on RT/duroid 6010LM with a return loss of 13 dB and an unloaded quality factor of Q ≈ 13 generates two distinct strong electric fields that can be manipulated to simultaneously detect two chemicals. Two asymmetric channels engraved in a polydimethylsiloxane sheet are loaded with analyte to produce a unique resonance frequency in each case, regardless of the dielectric constants of the liquids. Keeping in view the nature of lossy liquids such as ethanol, the initial structure and channels are optimized to ensure a reasonable return loss even in the case of loading lossy liquids. After loading the empty channels, Q is evaluated as 43. Ethanol (E) and deionized water (DI) are simultaneously loaded to demonstrate the detection of all possible combinations: [Air, Air], [E, DI], [DI, E], [E, E], and [DI, DI]. The proposed structure is miniaturized while exhibiting a performance comparable to that of existing multichannel microwave chemical sensors.
Highlights
The monitoring of several parameters at different processing steps is common in chemical industries and pharmaceutical plants and in quality control for the food industry [1]
A radiofrequency (RF) sensor chip realized from components and monolithic devices can be utilized as a multiple sensing device; its high power consumption could limit its widespread adoption
We describe the design process for the TM02-mode triangular-patch quarter-mode substrate-integrated waveguide (QMSIW)
Summary
The monitoring of several parameters at different processing steps is common in chemical industries and pharmaceutical plants and in quality control for the food industry [1]. A radiofrequency (RF) sensor chip realized from components and monolithic devices can be utilized as a multiple sensing device; its high power consumption could limit its widespread adoption. Simultaneous detection of multiple fluids using a single-chip sensor is the main objective of this study. Radio frequency (RF) technology-based sensors are generally noninvasive, small, inexpensive, and fabricated compared with nonelectromagnetic sensors. They are noncontact and operate in the ambient environment. Their sensitivity (lower limit of detection) is significantly lower than that of nonelectromagnetic sensors. Trends in RF sensors include enhancing the performance, miniaturization, and adding functionality, such as the capability to detect multiple chemicals. Hybrid sensors (RF sensors with additional coatings) have been utilized to obtain RF sensors with selectivity
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