| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite antenna device which can be small-sized by sharing an antenna element among a plurality of frequency bands, and in which cost can be reduced and antenna design is also facilitated thanks to reduction in the number of elements.SOLUTION: A composite antenna device includes a first tuning coil part 10, a second tuning coil part 20, and a common top capacitance part 30. The first tuning coil part 10 is connected to a common feeder part 1 and functions as a part of elements for FM frequency bands. The second tuning coil part 20 is connected to the common feeder part 1 and functions as a part of elements for Band-III frequency bands. The common top capacitance part 30 is connected to an end part of the common feeder part 1 opposite to the side where the first tuning coil part 10 and the second tuning coil part 20 are connected. The common top capacitance part 30 functions as a part of the elements for FM frequency bands and Band-III frequency bands and also functions as an element for AM frequency bands. |
