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1. 发明专利

JPH11260610A RADIO WAVE ABSORBING MATERIAL 失效
公开(公告)号：JPH11260610A
公开(公告)日：1999-09-24
申请号：JP6154398
申请日：1998-03-12
申请人： KANKYO DENJI GIJUTSU KENKYUSHO
发明人： OTA HIROYASU
IPC分类号： H01F1/00 , H01F41/02 , H05K9/00
摘要： PROBLEM TO BE SOLVED: To provide a radio wave absorbing material which provides absorptive attenuation of 20 dB or more in a greater frequency bandwidth. SOLUTION: A radio wave absorbing material constituted of a magnetic portion 1 mixed with a non-magnetic portion 2 is provided. In the case, the non-magnetic portion in the cross section of the absorptive material is caused to include an island portion having an average diameter of 10 μm or more, and the magnetic portion is made of a ferrite sintered body. The volumetric mixture rate F of the magnetic portion is set 0.2-0.8, and a relation 0.3 Fμrs '

2. 发明专利

JP2001066337A DEVICE FOR VISUALIZING ELECTRIC FIELD/MAGNETIC FIELD DISTRIBUTION 失效
公开(公告)号：JP2001066337A
公开(公告)日：2001-03-16
申请号：JP24149699
申请日：1999-08-27
申请人： SONY CORP , KANKYO DENJI GIJUTSU KENKYUSHO
发明人： OTA HIROYASU , KURIKI CHOEI
IPC分类号： G01R33/10 , G01R29/08
摘要： PROBLEM TO BE SOLVED: To accurately and continuously visualize and display a state of an electromagnetic field discharge of an overall material to be measured by supplying an electromagnetic field detection signal of an antenna to a band-pass filter and visualizing and displaying a signal level of the obtained detection signal. SOLUTION: The electric field/magnetic field distribution visualizing device comprises a plurality of array-like detecting display units 1 disposed on a sheet 2. As the sheet 2, a transparent insulation sheet having much flexibility is used. As the unit 1, an electric field display detecting display unit 10 having a dipole antenna 11, a band-pass filter 12 connected to the antenna 11 and a display element 15 is used. Here, the antenna 11 induces a high frequency voltage responsive to an applied electric field, and the filter 12 outputs the high frequency voltage as an electric field intensity detection signal. The signal of the output intensity is, for example, converted into a heat by the element 15 made of a resistor or the like. A heat amount responsive to the signal level is visualized by an infrared camera 5 to observe a space distribution state of the electric field.

3. 发明专利

JPH11354972A RADIO WAVE ABSORBER 失效
公开(公告)号：JPH11354972A
公开(公告)日：1999-12-24
申请号：JP16267598
申请日：1998-06-10
申请人： TDK CORP , KANKYO DENJI GIJUTSU KENKYUSHO
发明人： HONMA MOTOFUMI , OTA HIROYASU , TANAKA TAKASHI , KURIHARA HIROSHI
IPC分类号： H05K9/00
摘要： PROBLEM TO BE SOLVED: To exhibit a radio wave absorbing power in a high frequency range, including millimeter wave bands by fixing a radio wave absorptive material to a conductor plate which is composed of a powder of magnetoplumbite type hexagonal ferrite wherein part of Fe is substituted with one or more kinds of metals, or its mixture with grain holders or sintered material. SOLUTION: Owing to the uniaxially anisotropic crystal magnetic anisotropy of a magnetoplumbite type hexagonal ferrite, a ferroelectric resonance phenomenon occurs at 40-60 GHz. Powders of magnetoplumbite type hexagonal ferrite BaFe8 (Ti0.5 Mn )4 O19 and Z type hexagonal ferrite Ba3 Co2 Fe24 O41 and epoxy resin are mixed at a wt. ratio 35:35:30 to form a composite material which is sheeted into a flat plate of 2.7 mm thick and backed with a conductor (metal) plate to form a radio wave absorber and an absorbing power of 20 dB or more at a frequency of 5-18 GHz in free space is obtd. from its absorbing characteristic.

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