Compact transmission-line circuit for audio and microwave signals

In this paper, a transmission line is proposed to propagate both audio and microwave signals. The input and output chokes at audio input and output paths isolate the microwave signal transmitting to audio input and output respectively. The proposed transmission line shows that audio and microwave signals can be mixed together in the same line, which reduces the size of print circuit board (PCB). This proposed transmission-line circuit can be designed in any transmission structures and it shows that the overall result is the same as individual result.