Antenna, and radio-controlled timepiece, keyless entry system and RFID system using same
An electromagnetic wave and antenna technology is applied in the fields of antennas, electromagnetic wave watches using the antennas, keyless input systems and RFID systems, and can solve problems such as hindering electromagnetic wave reception.
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Embodiment 1
[0059] The antenna 1 having the main magnetic circuit member 2 and the auxiliary magnetic circuit member 3 shown in FIGS. 4( a ) and 4 ( b ) is manufactured as follows. The main magnetic circuit part 2 is made of Mn-Zn ferrite (specific magnetic permeability: 7000, ferrite MT80D manufactured by Hitachi Metals Co., Ltd.), and has a central part 4a (2mm x 2mm x length 8.4mm) and a cover The ends 4b and 4b on both sides (4mm×4mm×length 0.8mm) are processed into a magnetic core 4 and a coil 5 made of copper wire coated with insulating varnish with a wire diameter of 65 μm. The coil 5 is wound with 1180 turns. I wind it around the central part. 45% by volume of flat high-permeability nanocrystalline soft magnetic metal powder (refined pure metal (registered trademark) manufactured by Hitachi Metals Co., Ltd.) with a thickness of 1 μm and an average particle diameter of 35 μm was used as a binder resin ethylene methyl acrylate A thin slice (thickness: 0.13 mm) of a mixture (specifi...
Embodiment 2~4
[0064] An antenna was manufactured in the same manner as in Example 1 except that the thickness t of the sub-magnetic circuit member 3 was changed as shown in Table 1. In Example 4, such as Figure 11As shown, two secondary magnetic circuit members 3a, 3b each having a thickness of 0.5mm are attached to both sides of the end portions 4b, 4b of the magnetic core 4. As shown in FIG. The Q value, signal voltage S, noise voltage N, and S / N ratio were measured in the same manner as in Example 1. exist Figure 8-10 Indicates the result.
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