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Design of low‐loss directional couplers with compensated coupled‐line sections in suspended microstrip technique
Author(s) -
Smolarz Robert,
Wincza Krzysztof,
Gruszczynski Slawomir
Publication year - 2017
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21125
Subject(s) - microstrip , capacitive sensing , power dividers and directional couplers , hybrid coupler , compensation (psychology) , realization (probability) , capacitive coupling , capacitance , line (geometry) , coupling (piping) , acoustics , electronic engineering , electrical engineering , materials science , topology (electrical circuits) , engineering , physics , voltage , mechanical engineering , mathematics , geometry , psychology , statistics , electrode , quantum mechanics , psychoanalysis
Design of coupled line 3dB directional couplers realized in suspended microstrip technique has been presented. The main goal was to minimize the insertion losses of the coupler, what has been achieved by a proper choice of the realization technique. As the chosen coupled line geometry is asymmetric to achieve good electrical performance of the resulting coupler, capacitive compensation technique has been utilized to equalize capacitive and inductive coupling coefficients. Furthermore, a distributed‐element approach has been investigated for realization of compensation capacitances, due to their physical size resulting from the dielectric structure. The proposed coupler has been designed in two versions, having center frequencies equal to 0.89 and 1.1 GHz, manufactured and measured. The measurement results show good agreement with electromagnetic analyses and prove the correctness and usefulness of the presented design method. The manufactured couplers exhibit insertion losses as low as 0.08 dB at the center frequency.