IC card having a mica film for stable resonance frequency and enhanced antenna properties
First Claim
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1. An IC card, comprising:
- a mica capacitor comprising a mica film acting as a dielectric of said mica capacitor, electrodes formed on both sides of said mica film, an antenna coil, and an IC chip;
wherein;
said mica film acts as a substrate on which said antenna coil and said IC chip are provided, and stablizes a resonant frequency of said IC card as a result of a low water absorption rate of said mica film;
a first capacitor terminal is connected to a first terminal of said IC chip and is linked to a first terminal of said antenna coil;
a second capacitor terminal is connected to a second terminal of said IC chip; and
a third capacitor terminal is connected to a second terminal of said antenna coil; and
said IC chip is mounted on said mica film inside of said antenna coil, such that said IC chip does not overlay said antenna coil.
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Abstract
An IC card 10A has a mica capacitor that comprises a mica film 1 and electrodes 6a, 6b formed on both sides thereof, where the mica film 1 serves as a mounting substrate for an antenna coil 2 and an IC chip 3, thereby reducing profile of an IC card and also reducing its cost of manufacture and to stabilize its resonance frequency.
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Citations
3 Claims
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1. An IC card, comprising:
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a mica capacitor comprising a mica film acting as a dielectric of said mica capacitor, electrodes formed on both sides of said mica film, an antenna coil, and an IC chip;
wherein; said mica film acts as a substrate on which said antenna coil and said IC chip are provided, and stablizes a resonant frequency of said IC card as a result of a low water absorption rate of said mica film;
a first capacitor terminal is connected to a first terminal of said IC chip and is linked to a first terminal of said antenna coil;
a second capacitor terminal is connected to a second terminal of said IC chip; and
a third capacitor terminal is connected to a second terminal of said antenna coil; and
said IC chip is mounted on said mica film inside of said antenna coil, such that said IC chip does not overlay said antenna coil. - View Dependent Claims (2, 3)
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Specification