| 摘要 |
<p>An adjustable phase-shifting apparatus for use in shifting the phase of a microwave signal transmitted along a TEM transmission line, such as coaxial line whose inner and outer conductors have square cross-sections. The apparatus includes a body (60) with an elongated cavity therein which forms part of the outer conductor, and a cover (62) attached to the body which forms at least part of the outer conductor. The cover has at least one pair of elongated openings (104a1, 104a2) that provide access to a portion of the cavity. The apparatus also includes a movable member (100a) provided with at least one pair of elongated, tapered, dielectric-loaded projections (102a1, 102a2) that slidably pass through the elongated openings and are positionable about either side of the center conductor (64) to provide an adjustable phase lag. A digital or analog actuator, such as a solenoid (114a) or motor driven cam, is provided to slide the projections in and out of the cavity in a direction normal to the signal's direction through the cavity to enable adjustment of the phase lag or shift. Multiple pairs of openings in the cover and corresponding pairs of dielectric projections may be used along a common extended cavity in the body to provide a series of selectable phase shifts in a single apparatus. A pair of such phase shifters may be interconnected by a see-saw linkage so that the phase shifts produced by the shifters are equal but opposite. Several such interconnected pairs of phase shifters may be used to provide the phase shifts required in a phased array antenna.</p> |
