Miniaturized broadband 3-dB / 90° and 180° power splitters for GPS/GNSS anti-jam systems


  1. Caillet, M.
  2. Clénet, M.
  3. Sharaiha, A.
  4. Antar, Y.M.M.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
This document reports on compact broadband rat-race and branch-line hybrids designed in the 1.15-1.6 GHz frequency band using microstrip technology. Two relatively simple design techniques using a conventional unilayer fabrication process have been investigated. The technology described in this document has been specifically developed for designing antenna feeding circuits for GPS/GNSS anti-jam systems, but it can be used for other wideband applications. A miniaturized two-section 180° hybrid using microstrip space-filling curves has been designed and fabricated to operate between 1.15 and 1.6 GHz on an FR4 substrate. The miniaturized geometry area is 31% of the broadband two-section 180° hybrid area. The obtained performance is as good as the conventional geometry. A 3-dB coupling with maximum amplitude imbalance of less than 0.15 dB has been measured over the 1.15-1.6 GHz band. Over this frequency band, the phase variation is ±2°. The measured insertion loss is approximately 0.9 dB, and is mainly due to the substrate loss. To further reduce the footprint of the compact hybrid and the insertion loss, a second circuit has been designed on a substrate having a higher dielectric constant and lower loss (Cer10). The area of the second circuit is 54% of the hybrid area on the FR4 substrate. The measured performance is very similar, except that the insertion loss has been reduced by about 0.4 dB. The lumped distributed element method has been applied to miniaturize a two-secti

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Report Number
DRDC-OTTAWA-TM-2009-270 — Technical Memorandum
Date of publication
01 Feb 2010
Number of Pages
Electronic Document(PDF)

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