Synthesis of a Planar, Coupled-line Marchand Balun with Emphasis on Balance

摘要

The Marchand balun may be one of the most popular forms of microwave balun used to generate a balanced signal. In particular, the planar coupled-line Marchand balun shows good compatibility with microwave integrated circuits (MIC) and monolithic MICs (MMIC). Numerous studies about its design and analysis have been done since it was first introduced in 1944. Most designs, however, emphasize maximum power transfer to the balanced load within a specified passband using a quarter-wave transmission line equivalent circuit.