| 摘要 |
PROBLEM TO BE SOLVED: To attain the flattening of a gain in each frequency in an antenna with two trapezoidal elements. SOLUTION: An antenna 10 with two trapezoidal elements includes elements 12a and 12b, a feeding point 14 and a passive element 16. The elements 12a and 12b are symmetrical with the feeding point 14 as a center axis, widths of the elements 12a, 12b are H1. The antenna includes the feeding point 14, the length of a long side including the feeding point 14 is L1, and the length of a short side is L2. Furthermore, the passive element 16 is a conductor plate, and not connected with the feeding point 14. The length is L3 and the width is H3. The passive element is located apart from the elements 12a and 12b. In addition, the element 12a, 12b are shaped by obliquely cutting top ends 11a, 11b which are opposed to each other at short side top ends portions only by L4 in a length direction and H4 in a width direction. COPYRIGHT: (C)2008,JPO&INPIT
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