P31 - Electronics for Continuously Measuring the Resonance Frequency and Attenuation of a Split-Ring Resonator

Lippmann, M.; Hermeling, L.; Hitzemann, Moritz; Dehning, Kirsten J.; Zimmermann, Stefan

doi:10.5162/16dss2022/p31

Cited by 2 publications

(2 citation statements)

References 8 publications

(9 reference statements)

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“…The R SRR includes the ohmic and polarization and dielectric losses, respectively. A detailed description is given by Lippmann et al [ 26 ]. The inductance L SRR is determined in particular by the shape and size of the ring and can thus be assumed constant in a given design.…”

Section: Methodsmentioning

confidence: 99%

Split-Ring Resonator Based Sensor for the Detection of Amino Acids in Liquids

Dehning

Hitzemann

Gossmann

et al. 2023

Sensors

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Amino acids belong to the most important compounds for life. They are structural components of proteins and required for growth and maintenance of cells. Essential amino acids cannot be produced by the organism and must be ingested through the nutrition. Therefore, the detection of amino acids is of great interest when analyzing cell culture media and nutrition. In this work, we present a split-ring resonator as a simple but sensitive detector for amino acids. Split-ring resonators are RLC resonant circuits with a split capacitance and thus a resonance frequency that depends on the electromagnetic properties of a liquid sample at the split capacitance. Here, the split capacitance is an interdigital structure for highest sensitivity and covered with a fluidic channel for flow through experiments. First measurements with a vector network analyzer show detection limits in the range from 105 µM for glutamic acid to 1564 µM for isoleucine, depending on the electromagnetic properties of the tested amino acids. With an envelope detector for continuous recording of the resonance frequency, the split-ring resonator can be used in ion chromatography. At a flow rate of 0.5 mL/min, it reaches limits of detection of 485 µM for aspartic acid and 956 µM for lysine.

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Section: Methodsmentioning

confidence: 99%

Split-Ring Resonator Based Sensor for the Detection of Amino Acids in Liquids

Dehning

Hitzemann

Gossmann

et al. 2023

Sensors

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“…Inspired by the Pound-Drever-Hall technique [19,20], which is based on measuring the phase change in the emitted light to a reference oscillator and subsequent control of the light source, a new concept using two simultaneously measured attenuations in the frequency response of the resonator has been proposed by Lippmann et al [21]. A comparable methodology for tracking the resonance frequency has already been proposed in the field of atomic force microscopy [22][23][24] and is now to be transferred to the domain of electrical resonators, utilizing the concept presented in this work.…”

Section: Introductionmentioning

confidence: 99%

Continuous Recording of Resonator Characteristics Using Single-Sideband Modulation

Lippmann,

Hitzemann,

Hermeling

et al. 2024

Electronics

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Electrical resonators are usually characterized by their resonance frequency, attenuation and quality factor. External quantities can affect these parameters, resulting in a characteristic change in the resonator, which can be used as a sensor effect. This work presents a new concept and electronic device for the continuous recording of resonator characteristics using single-sideband modulation. A test signal consisting of a center frequency and two sidebands is generated and the center frequency is set close to the resonator’s resonance frequency while the two sidebands are adjusted symmetrically around the center frequency. By exiting the resonator with the test signal and demodulating the resulting output into individual frequency components, a continuous measurement of the attenuation is possible. The center frequency is adjusted so that both sidebands have equal attenuation, resulting in a center frequency that corresponds to the resonance frequency of the resonator. If the resonator does not show a symmetrical frequency response, the sideband attenuation ratio can be adjusted accordingly. Continuous recording of the resonator characteristics at a sampling rate of 100 Sps was verified using a digitally tunable RLC series resonator with resonance frequencies between 250 MHz and 450 MHz, resulting in a maximum error below 1.5%.

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P31 - Electronics for Continuously Measuring the Resonance Frequency and Attenuation of a Split-Ring Resonator

Cited by 2 publications

References 8 publications

Split-Ring Resonator Based Sensor for the Detection of Amino Acids in Liquids

Split-Ring Resonator Based Sensor for the Detection of Amino Acids in Liquids

Continuous Recording of Resonator Characteristics Using Single-Sideband Modulation

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