Full-wave finite space model of open-ended coaxial line for dielectric spectroscopy of liquids

2017 ◽  
Vol 88 (8) ◽  
pp. 084703 ◽  
Author(s):  
D. Jablonskas ◽  
S. Lapinskas ◽  
S. Rudys ◽  
M. Ivanov ◽  
J. Banys
Keyword(s):  
Dielectric Spectroscopy ◽  
Coaxial Line ◽  
Space Model ◽  
Full Wave ◽  
Finite Space

scholarly journals A Dual Band Patch Antenna with a Pinwheel-Shaped Slots EBG Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Zhaopeng Teng ◽  
Zhiqing Liu ◽  
Bincheng Li
Keyword(s):  
Patch Antenna ◽  
High Frequency ◽  
Coaxial Line ◽  
Microstrip Patch Antenna ◽  
Radiation Efficiency ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Planar Antennas ◽  
Microstrip Patch ◽  
Full Wave

A dual band microstrip patch antenna integrated with pinwheel-shaped electromagnetic band-gap (EBG) structures is proposed. The patch antenna consists of a pair of spiral slots on the patch and is fed by using coaxial line. Its full-wave simulation predicts dual bands from 4.43 GHz to 4.56 GHz and from 4.96 GHz to 5.1 GHz in the C-band. The designed EBG with eight pinwheel-shaped slots addresses smaller frequency drift compared with the traditional square mushroom-like EBG when applied to the patch antenna. With the help of designed EBG structure, the impedance bandwidth, radiation efficiency, and gain of the patch antenna are improved significantly. The 10 dB impedance bandwidth is extended by 3.4% and 6.5% at the low- and high-frequency bands, respectively. The radiation efficiency is increased by 5% and 17.8%, and the realized gain is enhanced by 1.87 dB and 1.56 dB at 4.57 GHz and 5.06 GHz, respectively. The designed EBG structure may have many applications in other types of planar antennas.

Open-Ended Coaxial Probes for Nondestructive Testing of Substrates and Circuit Boards

1994 ◽  
Vol 347 ◽  
Author(s):  
James Baker-Jarvis ◽  
Michael D. Janezic
Keyword(s):  
Nondestructive Testing ◽  
Coaxial Line ◽  
Wave Model ◽  
Circuit Boards ◽  
Low Frequencies ◽  
Full Wave ◽  
Coaxial Probes ◽  
Lift Off ◽  
Coaxial Probe ◽  
Probe Measurements

ABSTRACTThe results of the full-wave model theory for the open-ended coaxial probe with lift-off are presented and are applied to measurements of thin materials. The model allows the study of the open-ended coaxial probe as a nondestructive testing tool. The equations presented are valid for both dielectric and magnetic materials. The analysis yields insight into the effects of air gaps on probe measurements. Numerical results indicate that the probe is very sensitive to lift-off at low frequencies. This sensitivity decreases somewhat as frequency increases. In order for the field to penetrate the air gap, larger size coaxial line or higher frequencies need to be used. An application of the theory is performed by numerically solving the inverse problem using measured reflection coefficient.

Positional Estimation Within a Latent Space Model for Networks

Methodology ◽  
2006 ◽  
Vol 2 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Susan Shortreed ◽  
Mark S. Handcock ◽  
Peter Hoff
Keyword(s):  
Random Effects ◽  
Network Data ◽  
Random Effects Models ◽  
Space Model ◽  
Network Analyses ◽  
Recent Advances ◽  
Latent Space ◽  
Latent Space Model ◽  
Modeling Data

Recent advances in latent space and related random effects models hold much promise for representing network data. The inherent dependency between ties in a network makes modeling data of this type difficult. In this article we consider a recently developed latent space model that is particularly appropriate for the visualization of networks. We suggest a new estimator of the latent positions and perform two network analyses, comparing four alternative estimators. We demonstrate a method of checking the validity of the positional estimates. These estimators are implemented via a package in the freeware statistical language R. The package allows researchers to efficiently fit the latent space model to data and to visualize the results.

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