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Inventi Impact - Microwave

Articles

  • Inventi:emw/81/14
    WIDEBAND MICROSTRIP 90° HYBRID COUPLER USING HIGH PASS NETWORK
    Leung Chiu

    A wideband 90° hybrid coupler has been presented and implemented in planar microstrip circuit. With similar structure of conversional 2-section branch-line coupler, the proposed coupler consists of a lumped high-pass network but not the quarter wavelength transmission at the center. The values of all lumped elements were optimized to replace a quarter-wavelength transmission line with a phase inverter. To demonstrate the proposed concept, a 1-GHz prototype was fabricated and tested. It achieves 90% impedance bandwidth with magnitude of S11 less than -10 dB. Within this bandwidth, more than 13 dB port-toport isolation, less than 5.0 degree phase imbalance, and less than 4.5 dB magnitude imbalance are achieved, simultaneously. The proposed coupler not only achievesmuch wider bandwidth but also occupies less circuit area than that of the conversional 2-section branch-line coupler.

    How to Cite this Article
    CC Compliant Citation: Leung Chiu, “Wideband Microstrip 90° Hybrid Coupler Using High Pass Network,” International Journal of Microwave Science and Technology, vol. 2014, Article ID 854346, 6 pages, 2014. doi:10.1155/2014/854346. Copyright © 2014 Leung Chiu. This is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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