Abstract: The present invention relates to a structure of an antenna and its shielding structure for a mobile phone which may significantly reduce the hazardous electromagnetic wave transmitted to the user's body. The present invention arranges a monopole antenna inside of the mobile phone housing, and installs an electromagnetic wave absorber between the antenna and the circuit board. The electromagnetic wave absorber can absorb the electromagnetic wave reflected form conductive plate constituting the circuit board. Thus, the adverse effect of the reflected electromagnetic wave to the performance of antenna is prevented and the amount of the electromagnetic wave to which the users is exposed can be significantly reduced as well.

Abstract: A case for a secondary battery. The case for a secondary battery has a space in which an assembled battery unit including a positive electrode plate, a separator, and a negative electrode plate, is accommodated, and sealing portions welded along the periphery of the space, wherein at least one notch is present in the sealing portions.

Abstract: A method for evaluating radiation electric fields using output port powers of GTEM cell to obtain correlation between GTEM cell and Open Area Test Site(hereinafter, called OATS) in order to simulate electromagnetic wave radiation emission more accurate than GTEM(Giga-hertz Transverse Electromagnetic; hereinafter, called GTEM) cell, one of replacing facilities of OATS, a test facility for evaluating radiation emission for a test of electromagnetic interference(EMI). The adaption to a phase change of a dipole moment is very high by computing the electric field from a radiated matter using 15 GTEM cell output port powers as well as stably evaluating a radiation quantity upon considering the respective phase of the dipole illustrating an object due to various input values required in the algorithm.

Abstract: A method for manufacturing a case for a secondary battery includes preparing a case material in a plate state; setting a plurality of sections on the case material, each section including parts for forming a pan for a battery main body, a gas receiving portion disposed at a side of the pan, a path connecting the pan and the gas receiving portion, and a cover portion covering the pan and the gas receiving portion together; forming the pan of the battery main body, the gas receiving portion, and the path by molding the case material; and severing each section from the case material.

Abstract: A case for a secondary battery includes a pan having a space for accommodating a battery main body and an opening. A first bonding portion extends along the edge of the pan. A second bonding portion extends along the edge of the cover portion for corresponding attachment to the first bonding portion when folded onto the pan. Thus, mass production of the case is possible and the bonding portion becomes firm when the first and second bonding portions are bonded together.

Abstract: A rotary coupled transmission line cell is disclosed which generates standard electromagnetic waves needed for measuring the electromagnetic wave susceptibility (EMS), for measuring the electromagnetic wave interference (EMI) and for correcting the probe. In the present invention, two internal conductors are used to have a 4-port structure, and therefore, the generation of the circulation transmission waves are inhibited during the generation of the standard waves having arbitrary impedances. Therefore, accurate standard waves can be generated, and adjustments of arbitrary polarizations and arbitrary irradiating directions are made possible. Further, when an odd mode power supply is carried out to the internal conductors, the standard electromagnetic waves having a uniformity as high as 3 times that of the conventional ones can be generated. Further, an inverted L shaped test object supporting plate is installed, so that the polarization can be carried out with a greater adjustment width.

Abstract: A heterojunction bipolar transistor has a mesa including collector 604, base 603, and emitter 602 layers. The mesa has first and second sidewalls 606. An improved heat dissipation structure comprises a layer of electrically insulative and thermally conductive material 607 disposed on one of the sidewalls. A thermal path metal 600 is electrically connected to the emitter 602 and is disposed on the layer of electrically insulative and thermally conductive material 607. The thermal path metal 600 extends from the emitter 602 to the substrate 608 providing for efficient dissipation of heat that is generated by the HBT device.

Abstract: The present invention relates to the variable wave impedance generator (VWIF) which is used for the electric field intensity measuring instructor calibration, the magnetic field intensity measuring instructor calibration, the antenna calibration, and the unnecessary electronic wave interference and tolerance (EMI/EMS) measurement of the electric and electronic equipment using the features to generate the low impedance electronic wave (or, magnetic field) at the point meeting in phase, and the high impedance electronic wave (or electric wave) at the point meeting out of phase, when the power transmits in the coupled transmission line inside in the opposite direction from each other.

Abstract: A frequency multiplier circuit receives an input signal and generates an output signal. The input waveform (110) has a frequency F.sub.1. The output waveform (112) has a frequency nF.sub.1 wherein n is an even integer. The frequency multiplier circuit comprises first and second transistors T.sub.1 and T.sub.2, each transistor having a base, emitter, and collector. The emitters of each transistor are coupled together and are connected to an output load (108). The collectors of each transistor are coupled together and are connected to a voltage potential (109). The base of each transistor receives an input waveform, wherein a first input waveform (110) at the first transistor base is 180.degree. out of phase with a second input waveform (111) at the second transistor base.

Abstract: A 6 port TEM cell for measuring garbage EMI/EMS of an electrical and electronic equipment which can form an electromagnetic field of horizontal/vertical polarization using characteristic that internal electric field polarization is changed according to feeder line selection inside a multi-transmission line, and coupling amount among internal conductors is reduced by positioning the spherical internal conductors at corners of external conductors, thereby widening a test area.

Abstract: An automatic broadband electromagnetic generator is disclosed including a coaxial connector joint portion for maintaining impedance matching; a taper area placed between an object tested and the coaxial connector joint portion, and in which a force transmitting member for rotating an internal conductor is installed to enable external driving; a rotating table for performing bearing variation to the rotation of the object tested; and a terminal portion in which a radio wave absorber terminates high-band electromagnetic waves, a distribution resistor absorbs low-band electromagnetic wave, and a radio wave absorbing ferrite terminates their intermediate band.