| 摘要 |
1. In a strip-line microwave circulator comprising at least three central strip conductors disposed between parallel outer conductors and connected at one of their ends at a central point with said strip conductors, being parallel to said outer conductors and extending radially outwardly from said point, including predetermined angles with each other, a pair of concentric gyromagnetic discs disposed at said point each between one side of said strip conductors and the adjacent outer conductors, and means to magnetize said discs in a direction substantially at right angle to said conductors, to create microwave circulators switching action; the improvement consisting in the provision of unitary stub conductors disposed between any two adjacent ones of said strip conductors, each of said stub conductors having one end coupled with the junction between the respective strip conductors and extending outwardly along the symmetry line thereof to a distance being in excess of half the radius and less than the full radius of said discs, said strip conductors being in the form of an integral Y-shaped conducting spider strip with the axes thereof including equal angles of 120 DEG between them, said stubs consisting of a further spider strip concentric with and overlying said first spider strip and movable in a parallel plane relative to the latter so as to compensate for any minor imbalance of admittances at the input terminals of the circulator, said outer conductors comprising a first cover member and a bottom member extending over the respective ferrite discs, a casing ring connecting the first cover member to the bottom member, said means to magnetize said discs consisting of a single permanent magnet extending over said first cover member, a second cover member extending over said permanent magnet, the first and second cover members, a substantial portion of the casing ring and the bottom member being formed of magnetic material to provide a magnetic circuit for said permanent material.
|
