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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-08-31
Size Reduction and Harmonic Suppression of Rat-Race Hybrid Coupler Using Defected Microstrip Structure
By
Morteza Kazerooni,

    Dr. Morteza Kazerooni

    College of Electrical Engineering

    Iran University of Science and Technology (IUST)

    Iran

    Homepage

Morteza Aghalari

    Dr. Morteza Aghalari

    Electrical and Electronic Engineering University Complex

    Iran

    Homepage

Progress In Electromagnetics Research Letters, Vol. 26, 87-96, 2011
doi:10.2528/PIERL11071704 | Google Scholar

Abstract
In this paper, defected microstrip structure (DMS) is applied to design a compact microstrip rat-race hybrid coupler. The proposed structure introduces both harmonic signal suppression and a significant reduction of size because half of the ring is embedded in upper section. By embedding the DMS, it is observed that the third harmonic signal is suppressed to -25 dB with respect to a conventional rat-race hybrid coupler. Besides, this structure also effectively reduces the occupied area to 25% of the conventional case. Finally, using even and odd modes analysis the ABCD matrix of the proposed rat-race coupler was extracted. It is observed that the results are in good agreement with the full wave analysis and measurement.
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Citation
Morteza Kazerooni, and Morteza Aghalari, "Size Reduction and Harmonic Suppression of Rat-Race Hybrid Coupler Using Defected Microstrip Structure," Progress In Electromagnetics Research Letters, Vol. 26, 87-96, 2011.
doi:10.2528/PIERL11071704
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