| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-frequency sharing inverted F antenna in which an antenna gain is made high by making uniform horizontal plane direction characteristics and horizontal plane radiation characteristics without damaging the feature of the low attitude form of the inverted F antenna. <P>SOLUTION: Power is fed by locating a second frequency upper radiation element 10 at an intermediate position between a first frequency lower radiation element 1 and a first frequency upper radiation element 3. Besides, the first frequency upper radiation element 3 and the second frequency upper radiation element 10 are located without being mutually overlapped on a horizontal plane for avoiding mutual interference. By configuring the inverted F antenna for first frequency and the inverted F antenna for second frequency like this, the two-frequency sharing inverted F antenna can be provided. Further, a pair of respective upper and lower radiation elements each for first frequency and second frequency and respective short elements are defined as one unit and the respective elements are radially located in the horizontal direction for such a unit with a feeding point as a center so that the antenna can be made into multi-element. <P>COPYRIGHT: (C)2003,JPO |
