| 摘要 |
<p>A microwave variable attenuator (10) comprises a conductive substrate (30), a microstrip line (55), and a movable attenuator means (40) sandwiched between the microstrip line (55) and the substrate (30). The attenuator means is shaped so that the amount of its area between the microstrip line (55) and the substrate (30) can be changed by moving the attenuator means (40). In a preferred embodiment, a segment (45) of a disc embodies the attenuating material, and the disc is rotated to the desired orientation in an alumina guide (35). The attenuating material and the alumina guide (35) have the same dielectric constant. </p> |
