Permittivity Measurements at Microwave Frequencies Using Epsilon-Near-Zero (ENZ) Tunnel Structure

Lobato‐Morales, Humberto; Murthy, D. V. B.; Corona‐Chávez, Alonso; Olvera‐Cervantes, José‐Luis; Martinez-Brito, Juan; Guerrero-Ojeda, L.G.

doi:10.1109/tmtt.2011.2132141

Cited by 59 publications

(24 citation statements)

References 16 publications

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“…The ENZ tunneling phenomenon, described in [7] and [8], is used here for the design of Sensor-B. Such an effect can be obtained by coupling a narrow-height waveguide in its propagation mode.…”

Section: B Sensor-b (Siw Tunnel Sensor)mentioning

confidence: 99%

“…For the tunnel sensor, maximum couplings of 31.69 and 36.52 dB are generated with single and double feedings, respectively. The addition of the hybrids occupies an area of 440 mm in each of the sensors; however, enhanced couplings are achieved increasing the accuracy of the measurements in the system [1], [3], [5]- [8]. Ports 3 and 4 of the sensors are terminated with 50loads.…”

Section: Coupling Of the Sensorsmentioning

confidence: 99%

“…The frequency response for each sample is then analyzed in terms of the and factor by using the CPT for SIW structures [6], [8] (3a) (3b) with and being real and imaginary parts of the complex dielectric permittivity; the subscripts and indicate the case whether before perturbation or when perturbed with the sample, respectively; and , as well as and , are the operating frequencies and quality factors before the perturbation and when perturbed with the LUT, respectively; is the volume of the cavity/tunnel and is volume of the sample; and are constants related with the configuration of the circuits, mode of operation, shape and position of the sample inside the sensors. As the calculation difficulty of and is high, they are obtained experimentally by using standard samples of known dielectric properties [5], [6].…”

Section: Measurement and Characterization Of The Samplesmentioning

confidence: 99%

“…The cavity perturbation technique (CPT) for the characterization of dielectric measurements using SIW cavity resonators is presented by Lobato-Morales et al in [6]. A new type of dielectric-permittivity sensor exploiting the epsilon-near-zero (ENZ) effect is proposed by Alu and Engheta in [7]; and the experimental demonstration using an SIW ENZ sensor is reported in [8], achieving even higher sensitivity and smaller dimensions compared with the aforementioned circuits.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Lobato‐Morales

Corona‐Chávez

Olvera‐Cervantes

et al. 2014

IEEE Trans. Microwave Theory Techn.

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A wireless sensing system for the evaluation of the complex dielectric permittivity of solvent liquids is presented. Two sensing tags are proposed for testing of the samples. The first tag is based on a cavity resonator and the second makes use of the epsilon-near-zero effect. Both circuits are designed over the planar substrate-integrated-waveguide (SIW) technology, and operate at 4 GHz. A quartz capillary tube is used for the liquid measurements where only a small amount of sample volume is required. With the addition of planar antennas at the input and output of the sensors, the complete system is implemented for wireless sensing of the materials following the RF identification scheme. The cavity perturbation technique for SIW structures is applied for the dielectric liquid characterization. The proposed sensing tags and system have high potentials for low-cost wireless measurements and real-time monitoring applications.

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Section: B Sensor-b (Siw Tunnel Sensor)mentioning

confidence: 99%

Section: Coupling Of the Sensorsmentioning

confidence: 99%

Section: Measurement and Characterization Of The Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Lobato‐Morales

Corona‐Chávez

Olvera‐Cervantes

et al. 2014

IEEE Trans. Microwave Theory Techn.

Self Cite

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show abstract

“…In [7], Lobato-Morales et al make use of the cavity perturbation technique for the assessment of dielectric properties. A rectangular waveguide containing a narrow height epsilon-near-zero (ENZ) channel operating at 5.4-GHz is shifted by 660-MHz by samples placed in the centre of the ENZ tunnel.…”

Section: Introductionmentioning

confidence: 99%

Chipless RF liquid sensor

Cole

Almalki

et al. 2015

2015 IEEE MTT-S International Microwave and RF Conference (IMaRC)

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Abstract-A method for the wireless evaluation of the dielectric permittivity of liquids is presented. The use of a thinfilm, slotted waveguide sleeve around a standard unplasticised polyvinyl chloride pipe is proposed. Wireless interrogation of the slot with a plane wave excites a resonant mode whose frequency is dependent on the dielectric permittivity within the pipe. The proposed method allows for measurements to be taken in situ with no need for samples. The device has good potential for very low-cost monitoring applications, which may require real-time, continuous assessment.

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High‐precision dielectric sensor system based on balanced CSRR‐SIW resonators

Wang

et al. 2021

Int J RF Microw Comput Aided Eng

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A high-precision differential microwave dielectric sensor system based on a pair of CSRR-SIW resonators is introduced. The proposed method consists of four parts: the frequency-sweeping signal source, the balanced sensor based on CSRR-SIW, the RMS power detector, and the data acquisition system. Without a vector network analyzer (VNA) and other instruments, the electromagnetic properties of materials can be measured conveniently with the proposed method. In this work, two CSRR resonators inside SIW cavities are used as the balanced RF sensing components, one for measurement and the other for ref-

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Permittivity Measurements at Microwave Frequencies Using Epsilon-Near-Zero (ENZ) Tunnel Structure

Cited by 59 publications

References 16 publications

Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Chipless RF liquid sensor

High‐precision dielectric sensor system based on balanced CSRR‐SIW resonators

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