| 摘要 |
The invention relates to a phase shifter for high-frequency electric lines (36), wherein phase shifting is essentially achieved by specifically selecting the line length, the device essentially consisting of a circuit arrangement (30) equipped with coplanar lines. The adjustment possibilities of the various-length coplanar lines (32, 34) with regard to ohmic damping and impedance are preselected in such a way that ohmic damping and impedance are essentially the same on the selectively controllable, various-length conductive paths (32, 34) of the circuit arrangement (30). Adjustment possibilities include the width w of the particular central conductor (24) and the width b of the outer conductor (22), in addition to the spacing g between the central conductor (24) and the outer conductor (22). In conforming the various-length lines (32, 34), the situation that is specific for coplanar lines is utilized, namely that the impedance depends on w and g, but the ohmic resistance depends essentially only on w, that is, these two physical variables are capable of being adjusted quasi independently of each other. Since the ohmic damping and impedance are the same for the various-length conductive paths (32; 34), a change-over of the phase state is achieved while the insertion loss remains nearly constant. Phase shifters of this nature are suitable for beam sweeping in phased arrays in motor vehicle sensor technology. The radiation characteristics remain the same when the phase is shifted.
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