MATCHING DEVICE FOR ANTENNA OPERATION AT TWO DIFFERENT FREQUENCIES Russian patent published in 2005 - IPC

FIELD: radio engineering; antenna-feeder assemblies.

SUBSTANCE: proposed device has filter built around capacitor, first cylindrical spiral, and two inductance coils made in the form of second uniform cylindrical spiral. Turn number of first cylindrical spiral is smaller than that of second uniform cylindrical spiral. One end of first cylindrical spiral is connected to turn of second uniform cylindrical spiral; other end of first cylindrical spiral is connected through capacitor to filter output. Turn number of second uniform cylindrical spiral between point of connection of first cylindrical spiral end to turn of second uniform cylindrical spiral and its end connected to ground is smaller than that of first cylindrical spiral and smaller than turn number of second uniform cylindrical spiral between mentioned point of connection and end functioning as filter input. Turn number of second uniform cylindrical spiral between mentioned point of connection and its end used as filter input is greater than turn number of first cylindrical spiral.

EFFECT: improved standing-wave ratio, facilitated adjustment to desired frequency, simplified design, reduced size.

5 cl, 4 dwg