Wave Propagation Characteristic

In this section, a hexagonal SAW device based on LiNb03 substrate is modeled using hnite element technique. The wave propagation characteristics along the three different delay paths corresponding to crystal orientation with Euler angles (0, 90, 90),... 

AC analysis with a 5 V peak-peak input and 100 MHz frequency to study the wave propagation characteristics. 

In Chapter 2, wave propagation characteristics and transients in an overhead transmission line are described. The distributed parameter circuit theory is applied to solve the transients anal5 cally. The EMTP is then applied to calculate the transients in a power system composed of the overhead line and a substation. Various simulation examples are demonstrated, together with the comparison of field test results. 

As is well known, many physical phenomena are expressed mathematically as a second-order partial differential equation. Electrical transients associated with a wave-propagation characteristic are mathematically represented by a hyperbolic partial differential equation. 

Ametani, A. 1980. Wave propagation characteristics on single core coaxial cables. Scz. Eng. Rev. Doshisha Univ. 20(4) 255-273 (in Japanese). 

Ametani, A. et al. 1981. Wave propagation characteristics on an untransposed vertical twin-circuit line. lEE Japan B-101(ll) 675-682. 

We will now discuss the wave propagation characteristics of a three-phase single-core cable. Figure 3.13 and Table 3.2 show a cross section and the parameters of a tunnelinstalled cable. 

Ametani, A., Y. Miyamoto, and N. Nagaoka. 2003. An investigation of a wave propagation characteristic on a crossbonded cable. lEEJ Trans. PE 123(3) 395-401 (in Japanese). 

Based on Equations 7.42 and 7.46, the wave propagation characteristic on a grounding electrode is discussed. 

It is made clear that the so-called inductive characteristic of a grounding impedance is caused, in many cases, by the inductance of a current lead wire used in the measurement. The wave propagation characteristic on the electrode is determined by the soil permittivity in a VHF region, but is determined by in a lower-frequency region, where p is the soil resistivity and f is the frequency. Although the characteristic impedance of an electrode is proportional to In where r is the electrode radius, h the buried depth, and x the length, the effect of is more pronounced. 

Ametani, A., M. Nayel, S. Sekioka, and T. Sonoda. 2002. Basic investigation of wave propagation characteristics on an underground bare conductor. Proceedings ofICEE 2002, Jeju, Korea 2141-2146. 

Earth-return impedance has been well discussed, and its effect on the wave-propagation characteristic and the transient waveform is well-known, as is clear from a number of publications. Earth-return admittance [8,9,39,40], however, is neglected in most studies on wave propagation and surge characteristics, and its significant effect is not well understood [8,9,40, 41, 42 3]. 

Ametani, A., N. Nagaoka, R. Koide, and T. Nakanishi. 1999. Wave propagation characteristics of iron conductors in an intelligent building. Trans. lEE Jpn. B-120(l) 271-277. 

Ametani, A., K. Kawamura et al. 2013. Wave propagation characteristics on a pipe-type cable in particular reference to the proximity effect. lEE. High Voltage Eng. Conf. Kyoto, Japan, Paper HV-13-005. 

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