Coupled Nonuniform Transmission Line and Its Applications

Yamamoto, S.; Azakami, Takashi; ltakura, K.

doi:10.1109/tmtt.1967.1126432

Cited by 43 publications

(11 citation statements)

References 24 publications

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“…This suggests that the permittivity can alternatively be estimated with the mean value of the randomly generated profile of the line; therefore, avoiding the electromagnetic simulation. By using the mean of the permittivity of the segments of the line to estimate the effective permittivity for a specific realization of the profile instead of the electromagnetic simulation (8), the coefficients of model (10) are ao = 4, al = 0.091, a2 = 0.00, a 3 = 0.0159, a 4 = 0.00. There fore, the mean-based approach provides with an accurate and significantly more expeditious way to calculate the effective permittivity.…”

Section: Numerical Validationmentioning

confidence: 99%

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Homogenization technique for transmission lines with random permittivity profiles

Ochoa

Cangellaris

2013

2013 17th IEEE Workshop on Signal and Power Integrity

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This paper proposes a homogenization model for transmission lines with nonuniformity manifested in the random permittivity profile of their surrounding medium. The statistics of the permittivity profile are defined in terms of a finite series of correlated random variables corresponding to discrete samples taken along the longitudinal dimension of the line. Principal Component Analysis is employed to reduce the dimensionality of the random space that characterizes the uncertainty of the structure. Next, Polynomial Chaos expansion is used to capture the dependencies of the resulting homogeneous effective permit tivity with the reduced-order random parameters that define the variability. Such construction is performed efficiently with the use of a Sparse Grid integration technique. In particular, the statistics of the propagation time of a wave traveling in the uncertain medium are calculated with the proposed homogenization model and validated with Monte Carlo simulations.

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Section: Numerical Validationmentioning

confidence: 99%

“…The tra ditional approach to solve a NTL is based on the concatenation of ABCD matrices [8]. The idea of the mentioned approach is to describe the overall electromagnetic response of the system by taking the product of the individual ABCD matrices corresponding to each segment with uniform properties.…”

Section: Introductionmentioning

confidence: 99%

Homogenization technique for transmission lines with random permittivity profiles

Ochoa

Cangellaris

2013

2013 17th IEEE Workshop on Signal and Power Integrity

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“…The tapered transmission lines have shown good impedance matching over a wide range of frequency [19]- [24]. The geometry of the taper is chosen to minimize the reflection and optimize impedance matching and bandwidth.…”

Section: Uwb Antennamentioning

confidence: 99%

RF Propagation and Channel Modeling for UWB Wearable Devices

Yazdandoost

Sayrafian-Pour

Honda

2011

IEICE Trans. Commun.

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SUMMARYWireless body area network for sensing and monitoring of vital signs is the one of most rapidly growing wireless communication system and Ultra Wide-Band (UWB) is a favorable technology for wearable medical sensors. The wireless body area networks promise to revolutionize health monitoring. However, designers of such systems face a number of challenging tasks. Efficient transceiver design requires in-depth understanding of the propagation media which in this case is the human body surface. The human body is not an ideal medium for RF wave transmission; it is partially conductive and consists of materials of different dielectric constants, thickness and characteristic impedance. The results of the few measurement experiments in recent publications point to varying conclusions in the derived parameters of the channel model. As obtaining large amount of data for many scenarios and use-cases is difficult for this channel, a detailed simulation platform can be extremely beneficial in highlighting the propagation behavior of the body surface and determining the best scenarios for limited physical measurements. In this paper, an immersive visualization environment is presented, which is used as a scientific instrument that gives us the ability to observe three-dimensional RF propagation from wearable medical sensors around a human body. We have used this virtual environment to further study UWB channels over the surface of a human body. Parameters of a simple statistical path-loss model and their sensitivity to frequency and the location of the sensors on the body are discussed. key words: UWB antenna, immersive visualization system, channel model, body area network

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“…Nonuniform transmission lines (NUTL) have wide applicability in the microwave field as impedance transformers, filters, or directional couplers, just to mention a few [1]. In particular, exponential lines are an important category of NUTLs and their analysis has been extensively studied [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of coupled exponential microstrip lines by means of a multi-step perturbation technique

Manfredi

Zutter

Ginste

2016

2016 IEEE 20th Workshop on Signal and Power Integrity (SPI)

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Abstract-In this contribution, an iterative and adaptive multistep perturbation technique for nonuniform transmission lines is presented and applied to the analysis of coupled exponential lines. The Telegrapher's equations for nonuniform lines, which do not have a closed-form solution, are recast as the equations for uniform lines with equivalent distributed sources, for which a well-known numerical solution procedure exists. The line voltages and currents are computed in multiple steps by iteratively updating the distributed sources. The method turns out to be faster than classical solutions based on the discretization of the line into uniform subsections. Two validation examples are proposed that deal with coupled exponential lines, which have relevant applicability in microwave components.

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Coupled Nonuniform Transmission Line and Its Applications

Cited by 43 publications

References 24 publications

Homogenization technique for transmission lines with random permittivity profiles

Homogenization technique for transmission lines with random permittivity profiles

RF Propagation and Channel Modeling for UWB Wearable Devices

Analysis of coupled exponential microstrip lines by means of a multi-step perturbation technique

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