We discussed here fundamental charcters of the "Leaflet" as unit elements of TEM transmission lines. They are thoughted that the "Leaflets" are as planear distribution of the unit elements. The theoretical foundation for it, is Transmission Matrix that is based on "Multi-conducter Lines, especialy, Three-conducter Linese Theory. In general, the geometrical figures of the "Leaflets" are seemed to be "space hybrit" : SH. And the SH elements will be co-aided elements between the "space digital" : SD and the "space analogue" : SA. The rectangular types are treated here to be The FundameSDal Leaflets : FL. And it was shown that the FL have three poles in its immittance characteristics. These aim are for a developping procedure of the Humannic Intefaces Modeling, for example, with Music and Art Performance Systems.
Low-frequency noise measurements were carried out on semiconductor optical devices in the frequency and temperature ranges from 10 Hz to 100 kHz and from 77 K to 300 K, respectively. The samples are mainly photocouplers which include light emitting diodes (LED) and photodiodes (PD). The noise spectra of LED are considered to be superpositions of generation-recombination (g-r) noise components caused bv traps, and the activation energies of these traps are determined from the temperature dependence of noise. We also calculated the current dependence of noise and the correlation coefficients of noise between LED and PD, and discussed the mechanism and relation of these noises.
The possibility of distributed data transmission system which operates on noisy communication channel is discussed. The calculation shows that non-gaussian impulsive noise is main error source at high CNR with Middleton's class A model in BPSK while at low CNR and high A region of noise index is gaussian channel. It shows that the distributed data transmission has an effect on noise immunity with Fourier transform signal distributor and linear predictor against the non-gaussian impulsive noise.
Most obstacles of electronic equipments due to electrostatic discharge (ESD) are well-known to be caused by the electrification phenomena appearing with the human body walking, while this mechanism has not sufficiently been elucidated. For taking drastic measures against the ESD, it is necessary to understand both the occurrence-charge behaviors and human-body capacitance in relation to walking actions. From this point of view measurements of the occurrence charges and human potentials are made. The electrification properties are examined statistically for the furdamental walking-motions. The pace transitions of the human-potentials due to continuous walking and stepping are also shown and their prediction models are presented.
CISPR草案(1989)は、NSA(Normalized Site Attenuation)の概念を導入しているが、物理的意味が不明確な上、従来のCSA(Conventional Site Attenuation)との関係も明らかではない。本論文は、NSAとCSAの関係式を求めてグラフ化すると共に、新たにNSIF(Normalized Site Gain or Improvement Factor)を定義して、その有用性を示した。次に、異種長テストサイト間の相関値が、勧告による20Log(距離比)dbとは大きく異なる(5〜10dB以上)ことを例示し、これが現行の金属面大地を設けたオープン・エリア・テストサイト(Open Area Test Site)の宿命的欠陥であると述べている。
This paper is to clarify the methods to improve the degradation of shielding effectiveness by a low Q-factor in shielded enclosure; particularly to improve the degradation of shielding effectiveness by realising low Q at anti-resonance frequency in low frequencies. In shielded enclosure, there are several eigenfrequencies which are decided by geometric structures. At these eigenfrequencies, we can generally observe resonance and anti-resonance phenomna. The shielding effectiveness is low in anti-resonance frequency while it is high in resonance frequency. In order to avoid the degradation of shielding effectiveness, we have to lower a Q-factor at shielded enclosure. There are two methods to realize this purpose. One method is to realize low-Q by improving the shape of shielded enclosure. The other is to change a dielectric constant ε and/or permeability μ in space of the enclosure by using some microwave absorber.
The RF protection guideline, submitted on 25 June 1990 by M.P.T. of Japan tells us that exposure of RF field to the operator of an RF transmitter does not harm on his health as long as the rated output at the transmitter is not beyond 7 W at frequencies 100kHz to 3GHz. However, there arises a new question whether it is true regardless of the exposure duration. To answer the question we must refer to the experimental results obtained by Kues et al. : corneal endothelial abnormalities were observed after the 4h exposure duration of 2.45GHz CW to monkey's eyes. We traced their experimental study applying RF power density of 40mW/cm^2 which is beyond the threshold, 30mW/cm^2,shown by Kues et al., but we have not observed the same abnormalities as they had done.
This paper deal with the design of thin dielectric and ferromagnetic which consist of double layered structure, the first layer being covered with either loss less or lossy ferromagnetic material, there by making re lay impedance of the absorber match that of the free space with fairly thickness. The design procedures for two type of absorber are introduced, one being for the case where loss-less ferromagnetic material is applied over the surface of the first layer dielectric, when it has larger Tan δ_G than the optimum value and the other being for the absorber, which use thin lossy ferromagnetic material for the surface of the first layer dielectric, which has smaller Tan δ_G than optimum values.