Reseach on how the size of the high-ohmic sections of the compact branch-line coupler affects its characteristics

Abstract

Nowadays such super-high frequency devices as a microstrip branch-line coupler are widely used in present day's radio technical systems. This article contains an analysis of how thickness of the compact two-branch-line coupler's thin elements affects its characteristics. A constructions miniaturization procedure involves replacement of a microstrip transmission line section by a lowpass filter, which has the same phase shift as the replaced section. Constructions modeling is carried out and its frequency-response characteristics are obtained. Based on the research findings, it may be concluded that the accuracy of the compact elements manufacturing is very important when manufacturing samples.