| 摘要 |
A slot antenna according to the present invention includes: a ground conductor 12 provided on a rear face side of a dielectric substrate 101 , the ground conductor having a finite area; a slot 14 which recesses into the ground conductor 12 , beginning from an open-end point on a side edge of the ground conductor 12 ; and a feed line 261 for supplying a high-frequency signal to the slot 14 , the feed line 261 intersecting the slot 14 . At a first point near the slot, the feed line 261 branches into a group of branch lines including at least two branch lines, such that at least two branch lines in the group of branch lines are connected to each other at a second point near the slot to form at least one loop line 209 . A maximum value of a loop length of each loop line 209 is prescribed to be less than 1xeffective wavelength at an upper limit frequency of an operating band of the slot antenna. In the group of branch lines, any branch line that does not constitute a part of the loop line 209 but terminates with a leading open-end point has a branch length which is less than a ¼ effective wavelength at the upper limit frequency of the operating band.
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