Planar balun and power amplifier using the planar balun
View Patent ↗A planar Balun used in solid-state microwave generator and radio frequency component manufacturing includes an upper coupling line, a lower coupling line and a delay line segment. The upper coupling line comprises two coupling line segments connected in series by the delay line segment. The lengths and widths of the two coupling line segments are unequal to each other. The upper coupling line and the lower coupling line are electromagnetically coupled in an up-and-down arrangement to generate a balanced signal, and the balanced signal realizes the push-pull operation of a power amplifier.
1 . A planar Balun, applicable to an environment of solid-state microwave generator and radio frequency component manufacturing, comprising:
an upper coupling line;
a lower coupling line; and
an uncoupled delay line segment;
wherein, the upper coupling line comprises two coupling line segments, and the two coupling line segments are connected in series by the uncoupled delay line segment, and lengths and widths of the two coupling line segments included in the upper coupling line are unequal to each other; and
wherein, the upper coupling line and the lower coupling line are electromagnetically coupled in an up-and-down arrangement to generate a balanced signal, and the balanced signal realizes push-pull operation of a power amplifier.
2 . The planar Baluns according to claim 1 , wherein lengths and widths of two coupling line segments included in the lower coupling line are unequal to each other.
3 . The planar Baluns according to claim 1 , wherein the widths of the two coupling line segments included in the upper coupled line gradually become larger or smaller, and widths of two coupling line segments included in the lower coupling line gradually become larger or smaller.
4 . A planar Balun, applicable to an environment of solid-state microwave generator and radio frequency component manufacturing, comprising:
an upper coupling line;
a lower coupling line; and
a delay line segment;
wherein, the upper coupling line comprises two coupling line segments, and lengths and widths of the two coupling line segments included in the upper coupling line are unequal to each other; the lower coupling line comprises two coupling line segments, and lengths and widths of the two coupling line segments included in the lower coupling line are unequal to each other; and the two coupling line segments included in the lower coupling line have gradual impedance changing characteristic and are connected by the delay line segment.
5 . The planar Baluns according to claim 4 , wherein the widths of the two coupling line segments included in the upper coupling line are gradually increasing or decreasing, and the widths of the two coupling line segments included in the lower coupling line are gradually increasing or decreasing.
6 . The planar Baluns according to claim 4 , wherein a first end of each of the two coupling line segments included in the upper coupling line is connected to a common radio frequency ground through a via hole; and a second end of each of the two coupling line segments included in the upper coupling line is connected to a balanced output terminal.
7 . The planar Baluns according to claim 6 , wherein one end of a metal segment formed by connecting the two coupling line segments of the lower coupling line with the delay line segment is connected to the common radio frequency ground through a via hole, and the other end is connected to an unbalanced input.