ANTENNA DEVICE AND MANUFACTURING METHOD FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an antenna device having a structure for suppressing performance deterioration caused by reducing its height.SOLUTION: Four FM band antenna elements 401 to 404 and two AM band antenna elements 405, 406 are arranged in parallel on an antenna base 10. A circuit board 20 including a composite circuit connected to each antenna element in a one-to-one manner is arranged in an inner space of each of the antenna elements 401 to 406. To implement an omnidirectional characteristic in a horizontal plane, the antenna elements 401 to 406 are constituted by a linear conductor wound in a helical shape and a planar conductor that communicates with the linear conductor at a part substantially the most distant from a ground plane (antenna base 10).