Miniaturization of 3-dB/90° and 180° Power Splitters using Microstrip Technology


  1. Caillet, M.
  2. Clénet, M.
  3. Yahia, M.
  4. Antar, M.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
This document reports on the analysis and design of miniaturized 3-dB / 90° and 180° power splitters. Several miniaturization techniques are presented, and were applied to the design of microstrip splitters. Concerning the 3-dB / 180° splitters, two miniaturized microstrip circuits have been designed using two different methods. The first one is a Moore 2nd iteration fractal ring hybrid, of size 23 x 28 mm2 (23% of the conventional ring hybrid area) with similar performance over the 1.15-1.6 GHz frequency band. Over this band, characterization has shown a maximum 3-dB coupling imbalance of 1 dB and an output phase difference varying by 22° (± 11° ). The second proposed circuit is an H-shaped aperture-coupled transition, of compact size and wide frequency bandwidth. Its size is 23 x 30 mm 2, including the slot and matching network. Measurements revealed a maximum 3-dB imbalance of 0.3 dB and an output phase difference fluctuation of 1° (± 0.5° ) over the 1.15-1.6 GHz band. Regarding the 90° splitters, two miniaturization methods have been investigated to reduce the size of a branch-line hybrid. The first technique is based on fractal geometries as for the 180° splitter. A Sierpinski 2-nd iteration fractal branch-line hybrid has been simulated and showed a coupling imbalance of 0.4 dB and a phase difference variation of 1° (± 0.5° ) over a 10 % bandwidth. Its size is about 50 % of the area of the branch-line hybrid. The second miniaturization

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Report Number
DRDC-OTTAWA-TM-2007-257 — Technical Memorandum
Date of publication
01 Nov 2007
Number of Pages
Hardcopy;CD ROM

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