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A Novel Directional Coupler Loaded with Feedback Capacitances and Its Applications
Motomi ABE Yukihiro TAHARA Tetsu OWADA Naofumi YONEDA Hiroaki MIYASHITA
IEICE TRANSACTIONS on Electronics
Publication Date: 2016/01/01
Online ISSN: 1745-1353
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
feedback capacitance, coupled lines, tandem 3-dB coupler, stubs, rectangular coaxial line, 8×8 HYB matrix,
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A novel directional coupler loaded with feedback capacitances on the coupled lines is presented. Its effect of enhancing the coupling is qualitatively shown by deriving an equation for the coupling. Besides, a method to compensate for the phase difference between the even and odd modes of the coupler is presented. To demonstrate, a novel tandem 3-dB coupler consisting of the proposed coupled lines is designed and described. In addition, a waveguide (rectangular coaxial line) 8×8 HYB matrix using planar double-layer structure that is composed of the proposed tandem 3-dB couplers and branch-line couplers, which is operated in S-band, is designed and fabricated showing excellent performance.