| 摘要 |
Provided is a triplate line inter-layer connector having excellent loss suppression capability and allowing for inter-layer connection at any position, and a planar array antenna having uniform frequency characteristics in a beam direction. The triplate line inter-layer connector has an electrical connection structure between a first triplate line and a second triplate line. A first patch pattern is formed at a connection-side terminal end of a first feeder line. A first feed substrate has a first shield spacer disposed therebeneath, and a second shield spacer disposed just thereabove. Each of the first and second shield spacers has a hollow portion hollowed out to a size encompassing the first feeder line and the first patch pattern so as to define a corresponding one of first and second dielectrics in a respective one of the positions beneath and just above the first feed substrate. A second feeder line is provided on a second feed substrate together with a second patch pattern to extend in two directions from the second patch pattern to respective two output ends of the second feeder line, and a second ground conductor has a first slit formed in a portion thereof located approximately intermediate between the first and second patch patterns. The planar array antenna has a multi-layer structure comprising an antenna section and a transmission line section. The antenna section includes an antenna substrate and a first ground conductor having a slit. The antenna substrate has an antenna region which comprises a feeder line connected to respective radiation elements of the radiation element array. The feeder line, the slit and the patch pattern are provided at respective positions approximately corresponding to each other. Respective shapes and positions of the slit and the feeder line in a thicknesswise direction of the planar array antenna are adjusted to satisfy the following relation: d1<d2, where d1 is a maximum distance of an overlap region between the slit and the feeder line; and d2 is a distance between two straight lines which extend parallel to the longitudinal direction of the feeder line to sandwich the slit therebetween. The transmission line section includes a first shield spacer, a transmission line substrate having a transmission line, a second shield spacer and a second ground conductor.
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