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Progress In Electromagnetics Research B
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DESIGN METHOD OF MINIATURIZED RING COUPLER USING PHASE SHIFTERS CONSISTING OF FULLY-DISTRIBUTED COMPOSITE RIGHT/LEFT-HANDED STRUCTURES

By S. Simion

Full Article PDF (517 KB)

Abstract:
A new method to design a miniaturized ring coupler consisting of multiple open stubs on the inside of the ring is proposed. It is shown that this coupler topology may be seen as fully-distributed composite right/left handed (CRLH) small-size phase shifters, cascaded in a ring configuration. The CRLH phase shifter is analyzed in detail and a design method is proposed, pointing out the condition to obtain a reduction of its length. Using the fully-distributed CRLH based phase shifter, a ring coupler is configured and analyzed in comparison with the traditional ring coupler, showing that both couplers have similar characteristics. To validate the proposed design method, a 3-dB CRLH based ring coupler is designed and fabricated. The experimental results show a very good agreement with the predicted results obtained by electromagnetic simulation. The printed area of the fabricated coupler is 49% smaller compared to the traditional ring coupler.

Citation:
S. Simion, "Design Method of Miniaturized Ring Coupler Using Phase Shifters Consisting of Fully-Distributed Composite Right/Left-Handed Structures," Progress In Electromagnetics Research B, Vol. 50, 61-76, 2013.
doi:10.2528/PIERB13021001

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