Balun printed on substrate

摘要

A balun includes an input port, a first output port, a second output port and a coupling microstrip group including an input line connected to the input port, a first output line connected to the first output port, a first coupling line, a second output line connected to the second output port and a second coupling line. The input line includes a first coupling section connected to the input port, a second coupling section opposite to the first coupling section and a connecting section connected between the first coupling section and the second coupling section. An unbalanced signal is transformed into a first balanced signal via coupling among the first coupling section, the first output line and the first coupling line. An unbalanced signal is transformed into a second balanced signal via coupling among the second coupling section, the second output line and the second coupling line.

主权项

1. A balun printed on a substrate, comprising:
an input port operable to input an unbalanced signal; a first output port operable to output a first balanced signal; a second output port operable to output a second balanced signal; and a coupling microstrip group, operable to transform the unbalanced signal into the first balanced signal and the second balanced signal, the coupling microstrip group comprising an input line connected to the input port, a first output line connected to the first output port, a first coupling line, a second output line connected to the second output port and a second coupling line, wherein the input line comprises a first coupling section connected to the input port, a second coupling section opposite to the first coupling section, and a connecting section connected between the first coupling section and the second coupling section; the first output line and the first coupling line being respectively located at two sides of the first coupling section, one end of the first coupling line electrically connected to the first output line, the second output line and the second coupling line being respectively located at two sides of the second coupling section, one end of the second coupling line electrically connected to the second output line; the unbalanced signal being transformed into the first balanced signal via coupling among the first coupling section, the first output line and the first coupling line; the unbalanced signal being transformed into the second balanced signal via coupling among the second coupling section, the second output line and the second coupling line.