A Dual-Band Coupled-Line Coupler With an Arbitrary Coupling Coefficient
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AbstractA novel dual-band coupled-line coupler with an arbitrary coupling coefficient is proposed and investigated in this paper. The coupler has a simple structure and can realize a wide range of the same coupling coefficient over two designated frequencies. The mathematical design formula is also developed, which not only provides a straightforward design procedure, but also reveals the attractive features of the proposed coupler, including: 1) the same coupling coefficient in the dual frequency bands; 2) the sole dependence of a coupling coefficient on the ratio of the impedances of even and odd modes; and 3) a large range of the ratio of the dual frequencies. Two prototypes of the proposed couplers, one operating at 2.4/5.8 GHz with a - 10-dB coupling coefficient and the other working at 0.9/1.8 GHz with a - 15-dB coupling coefficient, have been designed, fabricated, and measured. The measured results demonstrate that the bandwidths for the 2.4- and 5.8-GHz bands are 22% and 19.8%, respectively, and that for the 0.9- and 1.8-GHz bands are 28.4% and 15.8%, respectively. Good correlation between the measured results and those of the theoretically designed justifies the proposed coupler circuit and the design theory.
All Author(s) ListWang X, Yin WY, Wu KL
Journal nameIEEE Transactions on Microwave Theory and Techniques
Volume Number60
Issue Number4
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages945 - 951
LanguagesEnglish-United Kingdom
KeywordsArbitrary coupling coefficient; coupled-line coupler; dual band
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC

Last updated on 2021-07-01 at 23:41