Systematic design of resonant microstrip sensors with sensitive coating

Pawlak, H.; Jannsen, B.; Jacob, Arne F.

doi:10.1002/mop.10081

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Another possible reason of discrepancy is due to the difference between, the dielectric data acquired from literature for simulation and actual dielectric values obtained from experiment. Also, it is reported that the higher humidity level in surrounding can affect the amount of resonance shift .…”

Section: Resultsmentioning

confidence: 99%

Determination of size-independent effective permittivity of an overlay material using microstrip ring resonator

Jilani

Wen

Cheong

et al. 2015

Microw. Opt. Technol. Lett.

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shown in Figure 7 with the simulation data at the same time. The performance summary is shown in Table 1.Core structures of the dual-band SIW filter are the CSRRs and CSRs. Relatively speaking, the influences of other geometrical parameters are not obvious. So that the filter has a potential to be much smaller. As shown in the photograph from Figure 8, length of the SIW is greatly reduced, and the taper microstrips are removed. After adjustment and optimization, its geometrical parameters are: l SIW 5 9 mm, w SIW 5 12 mm, r via 5 1 mm, w via 5 2 mm, w 2 5 1.2 mm, l 1 5 3 mm, l 3 5 1.9 mm, a 1 5 0.28 mm, b 5 5.2 mm, d 5 0.82 mm, g R3 5 0.3 mm u 1 5 0.22 mm, u 2 5 0.095 mm, h 5 7.5p, t 5 3.149 mm. The geometrical size of the simplified filter is 0.118k 0 3 0.184k 0 , where k 0 is the free space wavelength at the center frequency of lower passband. Furthermore, the performance of the filter does not decline with structure simplification, as shown in Figure 8, and Table 1.Due to processing inaccuracy, there are slight differences between the results of measurement and simulation. But overall, most of them are consistent, proving that the theoretical analysis of the design is correct. CONCLUSIONA new approach to design the dual-band SIW filter is proposed in this article. By modifying the CSRRs and loading them into the SIW with the CSRs together, the compact dual-band filters perform well. The interaction between the CSRRs and CSRs is discussed, indicating the potential on the combination of those two right/left-hand structures. After simulation and optimization, the proposed dual-band SIW filters are fabricated using normal PCB process. From the results of measurement, it can be seen that the proposed filters have good frequency selectivity, and excellent band rejection, which are consistent with the simulation results.ABSTRACT: This letter describes a size-independent effective permittivity of biological tissues, using microstrip ring resonator (MRR), to evaluate the moisture content more effectively. As permittivity is depends on material density, the optimum sample size where further size variations will not change the effective permittivity are identified. Using simulation and experimental results it is found that, a sample having thickness more than 9% of substrate height (t sub ) and width greater than 18.3% of guided wavelength (k g) shows size-independent effective permittivity. Both simulation and experimental results are in good agreement (within 3%). These findings allow more effective characterization of muscles according to their moisture content. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:4-9, 2016; View this article online at wileyonlinelibrary.com.

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Section: Resultsmentioning

confidence: 99%

Determination of size-independent effective permittivity of an overlay material using microstrip ring resonator

Jilani

Wen

Cheong

et al. 2015

Microw. Opt. Technol. Lett.

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“…Originally, they were used as a measurement tool for the characterization of the transmission properties of microstrip lines (Troughton 1969). Previously, they have been widely used as external probes for dielectric material properties (Bernard and Gautray 1991), moisture sensors (Abegaonkar et al 1999, Pawlak et al 2002 and active or passive filter elements in microwave systems (Lu and Ferendeci 1996). At THz frequencies, however, they have not been applied as sensor elements so far.…”

Section: Introductionmentioning

confidence: 99%

A functionalized THz sensor for marker-free DNA analysis

Nagel¹,

Richter²,

Bolívar³

et al. 2003

Phys. Med. Biol.

133

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We report on a novel resonant THz sensor for the label-free analysis of DNA molecules. The sensor allows the direct detection of DNA-probe molecules at functionalized electrodes via hybridization. Subsequent time resolved photoconductive sampling of the THz transmission identifies the binding state between probe and target DNA. Integrating neighbouring sensors on a chip, this technique can be extended to a parallel analysis of multiple DNA sequences. A clearly readable sensor response is obtained with less then 40 fmol of 20-mer single-stranded DNA molecules, indicating at least a sevenfold sensitivity increase compared to previous approaches.

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