NDLI: A Broadband Forward-Wave Directional Coupler Using Periodic Y-Shaped Ground Via Structures With Arbitrary Coupling Levels

Content Provider	IEEE Xplore Digital Library
Author	Jui-Chih Yen Sen-Kuei Hsu Tong-Hong Lin Tzong-Lin Wu
Copyright Year	1963
Abstract	A broadband forward-wave directional coupler loaded with periodic Y-shaped ground via structures is proposed. Broadband impedance matching of the even and odd modes can be approximately achieved. The proposed coupler can provide an almost constant phase difference between the even and odd modes over a wide frequency range. Therefore, a forward coupler with broad bandwidth can be expected. Based on the Bloch-Floquet theorem, the Bloch impedances and the electrical lengths of both modes can be predicted with the aid of our simple equivalent models. Also, a complete design procedure for arbitrary coupling level is provided. A test sample is fabricated on a low-temperature co-fired ceramic substrate with coupled-line length 2.02 λ_g. The coupling level over 1.5 dB can be measured from 4.5 to 10.4 GHz, which corresponds to the fractional bandwidth of 79.2%. To our knowledge, the proposed coupler is the smallest design with such a broad bandwidth.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	38
Ending Page	47
Page Count	10
File Size	2187413
File Format	PDF
ISSN	00189480
Volume Number	61
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Couplings Broadband communication Microstrip Couplers Periodic structures Impedance matching Inductance Bloch–Floquet theorem Forward-wave directional coupler (FWDC)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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