CATV 시스템용 신호분배회로망의 최적설계 및 제작에 관한 연구

Abstract

In this thesis, the transformer type tap-off and power divider as transmitting circuits for the CATV systems are studied. The CATV systems have been widely adopted in USA, Canada, Europe, Korea, Japan etc. The CATV systems have become more popular and have occupied an important position as a medium of mass communications according to the interface of the DBS(Direct Broadcasting Satellite) systems.

To transmit a high quality signal and to increase the number of channels, the broadband tap-off and power divider have become very important. In order to design broadband tap-off and power divider, proposed transformer type.

Thus, the optimum design and analysis method of the tap-off and power divider were proposed, where the even-mode and odd-mode method was adopted.

The measured results of frequency characteristics for the fabricated circuits agreed well with the theoretical results, and hence the validity of the proposed analysis and deign method were confirmed. Futhermore, insertion loss, reflection loss and the isolation of the fabricated tap-off showed excellent performance in the frequency band from 5 MHz to 2,500 MHz. In addition, the transformer type power divider for input port compensation showed better performance than conventional ones in the frequency band from 5 MHz to 1,000 MHz.