Unique Permittivity Determination of Low-Loss Dielectric Materials From Transmission Measurements at Microwave Frequencies

Hasar, Uğur Cem

doi:10.2528/pier10060805

Cited by 43 publications

(55 citation statements)

References 55 publications

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“…In the literature, various methods based on complex S 21 measurements have been proposed for stable ε r measurement of highloss and low-loss dielectric materials [30][31][32][33][34][35][36][37][38]. While the method in [30] assumes that the sample is low-loss and thin, the method in [31] uses a second-order approximation to derive a one-variable objective function for fast ε r measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Although the technique in [37] is attractive and applicable to low-loss samples, it is not appropriate for thin samples with lower dielectric constants. To eliminate this drawback, the method in our recently published paper [38] can be employed. However, the discussed methods in [34][35][36][37][38] need precise knowledge of the sample thickness.…”

Section: Introductionmentioning

confidence: 99%

“…To eliminate this drawback, the method in our recently published paper [38] can be employed. However, the discussed methods in [34][35][36][37][38] need precise knowledge of the sample thickness. Elimination this necessity is very crucial in the extraction of electrical properties of low-loss materials, as will be discussed in Results Section of the paper.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, any inhomogeneity or irregularity present in the second sample also lowers the measurement accuracy. Besides, swept-frequency phase measurements [34,35] or magnitude measurements [36][37][38] of S 21 over a broadband can be directly utilized to obtain unique ε r . While the formulation in [34], sometimes, requires at least three measurements at different frequencies for a correct initial guess of ε r , those in [35] are complex in nature.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming e jωt time convention, between calibration planes in Fig. 1, the normalized S 21 can be expressed as [24,38] …”

Section: Introductionmentioning

confidence: 99%

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Microwave Method for Thickness-Independent Permittivity Extraction of Low-Loss Dielectric Materials From Transmission Measurements

Hasar¹

2010

PIER

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Abstract-A non-resonant microwave method has been proposed for complex permittivity determination of low-loss materials with no prior information of sample thickness. The method uses two measurement data of maximum/minimum value of the magnitude of transmission properties of the sample to determine an initial guess for permittivity and find the sample thickness. An explicit expression for sample thickness and two expressions for inversion of the complex permittivity of the sample are derived. The method has been validated by transmission measurements at X-band (8.2-12.4 GHz) of a low-loss sample located into a waveguide sample holder.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Assuming e jωt time convention, between calibration planes in Fig. 1, the normalized S 21 can be expressed as [24,38] …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microwave Method for Thickness-Independent Permittivity Extraction of Low-Loss Dielectric Materials From Transmission Measurements

Hasar¹

2010

PIER

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A free space frequency‐time‐domain technique for electromagnetic characterization of materials using reflection‐based measurement

Aman

Singh²,

Nilotpal³

et al. 2020

Int J RF Microw Comput Aided Eng

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In this report, a free space frequency-time-domain technique is presented for characterizing the electrical properties and thickness of the sample using multiple reflections and fabry-perot resonance phenomenon. The retrieval of constitutive electromagnetic parameters of the sample has been carried out by comparing the measured reflection coefficient data from the sample at two different incident angles. The relative permittivity as well as relative permeability along with the thickness of different samples viz., beryllia, silicon, and plexiglass have been evaluated with high accuracy in the frequency range 1 to 15 GHz. The method is also experimentally validated by successfully reconstructing the unknown material properties of two different samples. The unique advantage of this method lies in non-requirement of any prior knowledge of the sample's thickness for measuring the complex relative dielectric constant as well as relative permeability of the sample. To determine the electromagnetic properties of the sample, the sole knowledge of reflection coefficient data are needed. Moreover, the method does not involve any additional measurement for the reference calibration. The simple, cost-effective proposed scheme is quite useful in many applications like accurate determination of signal strength in indoor wireless communication, through wall imaging, food industry, and so on.

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Microwave dielectric measurements of fibrous catalyst using transmission line technique in the frequency range of 1–4 GHz

Aboutaleb

Chi-Tangyie

Huddersman

et al. 2014

Micro & Optical Tech Letters

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flows are more dominant around of the meander-line slit embedded at radiating patch [13,14]. The proposed antenna with final design was built and tested. The measured and simulated return loss characteristics of the proposed antenna are shown in Figure 5. The fabricated antenna has frequency bands of 2.01-2.67 GHz, 3.25-3.75 GHz, and 5-6 GHz which are suitable for 2.4/5.2/ 5.8 GHz WLAN and 2.5/3.5/5.5 GHz WiMAX applications. Figure 6 illustrates the measured radiation patterns, including the copolarization and cross-polarization, in the H-plane (x-z plane) and E-plane (y-z plane). It can be seen that the radiation patterns in x-z plane are nearly omnidirectional for the three frequencies [15][16][17].This antenna element can be arrayed for use in MIMO applications. The performance of an antenna array suitable for MIMO applications is based on various parameters such as mutual coupling and radiation pattern. Based on the four possible configurations that any two such monopole antennas can be arranged beside each other. Figure 8 shows the relevant simulated S-parameters. In each case, the spacing between array elements is set at 15 mm (k/10 of the lowest frequency band) [9, 10]. From Figure 7 results, it can be seen that the array structures of Figures 7(c) and 7(d), in which the antenna elements are orthogonal, show lower mutual coupling than those structures in which the elements are parallel. For such orthogonal elements, the pattern of each element lies on a plane. CONCLUSIONA new small monopole antenna with triple-band performance for WLAN/WiMAX applications is presented. The operating frequencies of the proposed antenna are 2.4/3.5/5.5 GHz, which covers WLAN and WiMAX systems. To generate a triple-band performance for the proposed antenna, we use two meander-line slits in the ground plane and radiating patch, respectively. Two-element arrays of such antennas in four different configurations for MIMO applications are analyzed. Simulated and experimental results show that the proposed antenna could be a good candidate for MIMO application.ACKNOWLEDGMENT

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Unique Permittivity Determination of Low-Loss Dielectric Materials From Transmission Measurements at Microwave Frequencies

Cited by 43 publications

References 55 publications

Microwave Method for Thickness-Independent Permittivity Extraction of Low-Loss Dielectric Materials From Transmission Measurements

Microwave Method for Thickness-Independent Permittivity Extraction of Low-Loss Dielectric Materials From Transmission Measurements

A free space frequency‐time‐domain technique for electromagnetic characterization of materials using reflection‐based measurement

Microwave dielectric measurements of fibrous catalyst using transmission line technique in the frequency range of 1–4 GHz

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