| 摘要 |
Grounding conductors (4g, 5g), a conductor (4a) for a transmission line, a conductor (4k) for a coupling line are formed on a dielectric substrate (3). A dielectric filled waveguide is composed of a lower conductive sheet (1), an upper conductive sheet (2), a lower dielectric strip (6), and an upper dielectric strip (7). The dielectric substrate (3) is sandwiched therebetween. A cut-off region of the dielectric filled waveguide is composed of a conductor portion (S) which is a part of the grounding conductor of the dielectric substrate. The conductor (4k) for a coupling line is coupled at a portion where the electric field strength of the standing wave produced in the cut-off region. Hence, a planar circuit can be disposed parallel to the direction of the propagation of an electromagnetic wave propagated through a microwave waveguide. As a result, the process of the dielectric substrate is facilitated. The characteristics of coupling of the planar circuit to the microwave waveguide constituted on the dielectric substrate are immune to the precision of assembly of both the planar circuit and the microwave waveguide. Therefore, line conversion characteristics can be easily obtained as designed.
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