BROADBAND MICROSTRIP BALUN AND MANUFACTURING METHOD THEREOF

摘要

A broadband microstrip balun and a manufacturing method thereof are provided to remove unnecessary parasitic component by connecting an unbalanced transmission line and a balanced transmission line through an opening. A broadband microstrip balun includes a first strip line(101), a second strip line(301), and a common ground plane(200). The first strip line is formed on an upper substrate(100). An input port(102) is formed in one end of the first strip line. The second strip line is formed on a lower substrate(300). An output port(302) is formed in both end parts of the second strip line. A part of the second strip line is overlapped with the first strip line. The common ground surface is formed between the upper substrate and the lower substrate. The common ground surface has an opening. The opening is the overlapped part of the first strip line and the second strip line.