To provide a double resonant antenna which attempts to reduce size while balancing an antenna characteristic on the high frequency side with an antenna characteristic on the low frequency side at a low cost, a method for manufacturing the same, and a communication device using the same.
According to the double resonant antenna, when a first antenna electrode 2 is an antenna electrode for low frequency and a second antenna electrode 3 is an antenna electrode 3 for high frequency, since a high dielectric part 5 having a high dielectric constant is provided under a part including a free end which is highest in electric intensity in the first antenna electrode 2, the first antenna electrode 2 can secure an effective electric length without substantially requiring a folded part. Further, the high dielectric part 5 scarcely affects a radiation characteristic of the second antenna electrode 3. For this reason, the second antenna electrode 3 can secure an effective bandwidth. Accordingly, the double resonant antenna can balance the antenna characteristic on the high frequency side with the antenna characteristic on the low frequency side.
SHIMODA HIDEAKI
URABE JUNICHIRO
HIRABAYASHI NORIYUKI
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