Patent ID: 8497807
Filing Date: 2013-07-30
Classification: H01Q

Abstract:
1. An antenna apparatus that is projected with a height of 70 mm or less when mounted, comprising: an antenna case; and an antenna portion that is accommodated in the antenna case, wherein the antenna portion includes: a conductive antenna base that is fitted in a lower end of the antenna case so as to close a lower surface of the antenna case; an antenna board that is vertically provided on the antenna base, an antenna pattern being formed in an upper portion of the antenna board; a conductive top portion whose section is formed into a chevron shape is disposed so as to stride over the antenna board, the top portion including an apex portion and side portions that are formed as inclined planes from both sides of the apex portion, a proximity of the apex portion being connected to the antenna pattern, an antenna element including the top portion and the antenna pattern, a longitudinal length of the top portion being longer than a longitudinal length of the antenna pattern formed in the upper portion of the antenna board; and an amplifier board that is disposed on the antenna base, an amplifier being provided in the amplifier board, the amplifier amplifying signals of an AM broadcast and an FM broadcast, the AM broadcast and the FM broadcast being received by the antenna element, wherein a distance between the antenna base and a lower edge of the side portion in the top portion is not lower than about 10 mm, a size of the top portion is configured such that an antenna capacitance of the antenna base becomes about 3 pF or more, and the antenna pattern in the antenna board is connected to an input of the amplifier in the amplifier board through a coil that compensates inductance of the antenna element.