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Vacuum microwave electronics, including microwave power tubes, vacuum microelectronics and high power microwaves,development in China is described in this paper.
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An accurate analytical method to analyze the wave scattering and guidance by electromagnetic crystals is discussed, using a model of multilayered periodic arrays of circular cylinders. The approach is based on the lattice sums of ...
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An accurate analytical method to analyze the wave scattering and guidance by electromagnetic crystals is discussed, using a model of multilayered periodic arrays of circular cylinders. The approach is based on the lattice sums of periodic scatterers. the T-matrix of a circular cylinder, and the generalized reflection and transmission matrices for a layered system.
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In finite spaces such as tunnels and mines, mobile communication is mostly implemented by using leak coaxial cable. Starting from the basic electromagnetic theory, the radiation characteristics of eight-slot leaky coaxial cable is...
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In finite spaces such as tunnels and mines, mobile communication is mostly implemented by using leak coaxial cable. Starting from the basic electromagnetic theory, the radiation characteristics of eight-slot leaky coaxial cable is studied, the existing condition of radiation mode is given, and the frequency bandwidth of the single-mode radiation is discussed. In this paper, the authors point out that the cable does not have radiation waves of even mode but only has waves of odd mode such as -1, -3, -5 and so on. A series of new slots can be opened at the outer conductor of the cable where the distance between the new slot and old ones is P/2n where n must be an odd number and it should be equal to or less than -3. Consequently, the corresponding high-order mode is restrained and the frequency bandwidth of the single-mode radiation is extended. The conclusions have all important meaning to the design and use of eight-slot leaky coaxial cable.
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摘要 :
Starting from the basic electromagnetic theory, the radiation characteristic of eight-slot leaky coaxial cable is studied, the existing condition of radiation mode is given, and the frequency bandwidth of the single-mode radiation...
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Starting from the basic electromagnetic theory, the radiation characteristic of eight-slot leaky coaxial cable is studied, the existing condition of radiation mode is given, and the frequency bandwidth of the single-mode radiation is discussed. In this paper, authors point out that the cable does not have radiation wave of even mode but only have wave of odd mode such as-1, -3, -5 and so on. A series of new slots can be opened at the outer conductor of the cable where the distance between the new slot and old ones is P/2n where n must be odd number and it should be equal or less than -3. Consequently, the corresponding high-order mode is restrained and the frequency bandwidth of the single-mode radiation is extended. The conclusions have an important meaning to the design and use of eight-slot leaky coaxial cable.
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摘要 :
In finite spaces such as tunnels and mines, mobile communication is mostly implemented by using leak coaxial cable. Starting from the basic electromagnetic theory, the radiation characteristics of eight-slot leaky coaxial cable is...
展开
In finite spaces such as tunnels and mines, mobile communication is mostly implemented by using leak coaxial cable. Starting from the basic electromagnetic theory, the radiation characteristics of eight-slot leaky coaxial cable is studied, the existing condition of radiation mode is given, and the frequency bandwidth of the single-mode radiation is discussed. In this paper, the authors point out that the cable does not have radiation waves of even mode but only has waves of odd mode such as -1, -3, -5 and so on. A series of new slots can be opened at the outer conductor of the cable where the distance between the new slot and old ones is P/2n where n must be an odd number and it should be equal to or less than -3. Consequently, the corresponding high-order mode is restrained and the frequency bandwidth of the single-mode radiation is extended. The conclusions have all important meaning to the design and use of eight-slot leaky coaxial cable.
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Indoor radiowave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in unive...
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Indoor radiowave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in university buildings. The power-distance gradients were found. The penetration loss of walls was calculated from measured data. Calculated cumulative distribution function (CDF) showed that spatial distribution of power resembles the log-normal distribution.
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Indoor radio wave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in univ...
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Indoor radio wave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in university buildings. The power-distance gradients were found. The penetration loss of wall was calculated from measured data. Calculated CDF showed that spatial distribution of power resembles log-normal distribution.
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摘要 :
Indoor radiowave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in unive...
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Indoor radiowave propagation is studied by mathematical models of 5 and 7 ray multipath. Frequency response and impulse response are calculated. Measurement of spatial variation of receiver power were performed at 5 sites in university buildings. The power-distance gradients were found. The penetration loss of walls was calculated from measured data. Calculated cumulative distribution function (CDF) showed that spatial distribution of power resembles the log-normal distribution.
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