Compensating on-chip transmission line losses for a high-sensitivity microwave sensor

Resonator- and Filter-Induced Slow Waves for High-Sensitivity RF Interferometer Operations

“…Strong electric field will contribute to sensitivity enhancement besides slow wave effects. 21 , at a few specified frequency points. The apostrophe indicates the device with PDMS slabs.…”

“…The working principle of the interferometer has been introduced in [11]. Coplanar waveguides (CPW), which have higher sensitivity and broader bandwidth than micro-strip lines [21], have often been used as the sensing structures to generate RF fields and interact with MUTs. The quasi-TEM mode RF fields are non-dispersive with a field distribution and intensity well defined by CPW geometries.…”

Determination of the complex permittivity of microfluids in a microstrip geometry

“…The benefits of using microstrip over coplanar technology are twofold: (i) compared to a CPW field distribution, a greater proportion of the fundamental mode field pattern can be made to overlap the chamber containing the analyte, as shown in Fig. , thus improving the potential sensitivity over coplanar devices almost 2‐fold as noted in and (ii) the field distribution in a CPW is most concentrated very close to the CPW slots and dissipates further away, whereas a microstrip field overlaps the fluid analyte chamber in a more uniform fashion, which is potentially helpful when attempting to make counts of suspended particulates adrift in the fluidic chamber (e.g., biological cells in ), especially when there are a small number of particles or a concentration gradient is present. A CPW device would overemphasize the region closer to the trace, whereas a microstrip has a more uniform interrogation of the sample and the location of any particulates in the chamber is therefore less influential on the result.…”

“…Much of the recent literature has emphasized a coplanar geometry for these approaches , which places the fluid sample on top of a coplanar waveguide (CPW) or a planar capacitive element. It was speculated (though not developed further) in that the sensitivity of these measurements could be improved by increasing the degree of overlap between the electromagnetic waves and the analyte in a geometry such as microstrip. Nevertheless, comparatively few recent works have been presented in microstrip, and of these, seldom in the suggested manner.…”

Dual‐band microwave device for sensing dielectric property changes in microfluidic channels

“…[5], further research results about sensitivity improvements and loss compensations are reported in Refs. [6] and [7], respectively.…”