| 摘要 |
<p>A glass antenna is provided which can obtain a reception property that can meet two frequency bands of a low frequency band and a high frequency band without a choke coil for the low frequency band and allow a directivity of the high frequency band to come closer to a round shape. The glass antenna includes a shared antenna conductor which meets a first frequency band and a second frequency band higher than the first frequency band and a feeding part 16 connected to the shared antenna conductor. The shared antenna conductor includes a first element 1 extended from the feeding part 16 as a starting point and a second element 2 extended from the first element 1 as a starting point. A termination C of an extension of the first element 1 and a termination B of an extension of the second element 2 are provided to be close to each other so that at least a part of the first element 1 and the second element 2 configure a semi-loop form having a cut-out part 13 in a part of a loop form. When it is assumed that a wavelength in air in a central frequency of the second frequency band is » 02 , a glass shortening coefficient of wavelength is k 2 (in this case, k 2 = 0.64) and k g2 = » 02 ·k 2 , a conductor length of the first element 1 is 0.65 » g2 or higher and 1.0 » g2 or lower, and the shortest distance between a defogger 30 provided in window glass 12 and the shared antenna conductor is 15 mm or longer.</p> |
