Analysis and Design of Branch-Line Hybrids with Coupled Lines

@article{citeulike:2678823, abstract = {The scattering parameters of four-ports consisting of coupled lines with coupled or uncoupled connecting branches are derived in terms of the even- and odd-mode impedances and the lengths of the lines. These are used to analyze and formulate basic design procedures for the application of these structures as directional couplers including 0\&\#176; and 90\&\#176; 3-dB hybrids. The proposed new structures are quite compact at lower frequencies as compared to conventional uncoupled branch-line and rat-race hybrids. The results for the case of the coupled-line four-port with uncoupled branch lines also lead to closed-form expressions for the lengths and impedances of the lines required to nullify the effect of coupling between the main lines of a conventional branch-line coupler for use at higher frequencies. The measured response of the fabricated couplers is in good agreement with the theoretical predictions.}, author = {Tripathi, V. K. and Lunden, H. B. and Starski, J. P. }, booktitle = {Microwave Theory and Techniques, IEEE Transactions on}, citeulike-article-id = {2678823}, journal = {Microwave Theory and Techniques, IEEE Transactions on}, keywords = {branch-line, coupler, line}, number = {4}, pages = {427--432}, posted-at = {2008-04-16 20:41:30}, priority = {2}, title = {Analysis and Design of Branch-Line Hybrids with Coupled Lines}, url = {http://ieeexplore.ieee.org/xpls/abs\_all.jsp?arnumber=1132694}, volume = {32}, year = {1984} }

TY - JOUR ID - citeulike:2678823 L3 - citeulike-article-id:2678823 TI - Analysis and Design of Branch-Line Hybrids with Coupled Lines T2 - Microwave Theory and Techniques, IEEE Transactions on JF - Microwave Theory and Techniques, IEEE Transactions on VL - 32 IS - 4 SP - 427 EP - 432 N2 - The scattering parameters of four-ports consisting of coupled lines with coupled or uncoupled connecting branches are derived in terms of the even- and odd-mode impedances and the lengths of the lines. These are used to analyze and formulate basic design procedures for the application of these structures as directional couplers including 0° and 90° 3-dB hybrids. The proposed new structures are quite compact at lower frequencies as compared to conventional uncoupled branch-line and rat-race hybrids. The results for the case of the coupled-line four-port with uncoupled branch lines also lead to closed-form expressions for the lengths and impedances of the lines required to nullify the effect of coupling between the main lines of a conventional branch-line coupler for use at higher frequencies. The measured response of the fabricated couplers is in good agreement with the theoretical predictions. KW - branch-line KW - coupler KW - line AU - Tripathi, VK AU - Lunden, HB AU - Starski, JP PY - 1984/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1132694 ER -