| 摘要 |
Folded dipole antenna elements ( 2, 4 ) are disposed generally in parallel, being spaced by a distance smaller than a half of the wavelength employed. The antenna elements ( 2, 4 ) are connected to a combiner ( 16 ) via feeders ( 12, 14 ) having different lengths. The difference in length between the feeders ( 12, 14 ) is such that received signals resulting from a radio wave coming to the antenna elements ( 2, 4 ) from the front and received by the antenna elements ( 12, 14 ) are in phase with each other at the inputs ( 16 a , 16 b) of the combiner ( 16 ), whereas received signals resulting from a radio wave coming to the antenna elements ( 2, 4 ) from the back and received by the antenna elements ( 12, 14 ) are 180° out of phase with each other at the inputs ( 16 a , 16 b) of the combiner ( 16 ).
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