| 摘要 |
A mobile radio apparatus antenna for improving the gain and widening the band is provided. A inverted-L antenna ( 10 ) is a feed element with one end thereof electrically connected to one plate surface of a circuit board ( 12 ) through a feed point. The circuit board ( 12 ) is a circuit board of a mobile radio apparatus, to which the circuit parts including the inverted-L antenna ( 10 ) are connected. A planar antenna ( 14 ) is provided facing the backside plate surface of the plate surface of the circuit board ( 12 ), to which the inverted-L antenna ( 10 ) is connected, and is a parasitic element with an electrical length in the length direction set to approximately ½ of the wavelength of radio waves communicated by the mobile radio apparatus. Here, the dimension of the inverted-L antenna ( 10 ), the circuit board ( 12 ), and the planar antenna ( 14 ), and the distance therebetween are adjusted to predetermined values, so as to change the self-impedance of the inverted-L antenna ( 10 ), the self-impedance of the planar antenna ( 14 ), and the mutual impedance between the inverted-L antenna ( 10 ) and the planar antenna ( 14 ).
|
