NDLI: Directional coupler with arbitrary even and odd mode impedance product for power monitoring applications

Content Provider	IEEE Xplore Digital Library
Author	Kearns, B. Napijalo, V.
Copyright Year	2010
Description	Author affiliation: 184 Bellevue, Block D, South Circular Road, Dublin 8, IRELAND (Napijalo, V.) \|\| 11 Beech Row Cottages, Old Nangor Road, Dublin 22, IRELAND (Kearns, B.)
Abstract	This paper presents a new approach towards the design and use of directional couplers for power monitoring in RF front-end circuits. A conventional power monitoring circuit comprises a weakly coupled directional coupler and an attenuator at the coupled port where the attenuator desensitises the coupler from the effects of a mismatch at the coupled port. In a conventional design, the dimensions of the coupled lines are chosen so that the product of the even and odd mode impedances is equal to the square of the reference impedance; this condition ensures good matching of the coupler at all ports. An alternative approach to achieve high directivity is presented where the product of the impedances terminating the direct port and the coupled port is adjusted to match the product of the even and odd mode impedances of the coupled lines. For applications demanding 50 Ohm terminations at all ports, impedance transformation is employed. Measurements of fabricated directional couplers are presented showing improvements in directivity which are available through this new design approach. Specifically, it is shown that a directional coupler fabricated in a multilayer LTCC substrate offers improved directivity when terminated into a lower impedance at the coupled port. Thus, a capability to correct systematic errors in the fabrication process of directional couplers is provided. Furthermore, the freedom to choose lower terminating impedances at the design stage opens up the potential to produce RF couplers which make use of the capability to fabricate closely spaced transmission lines in high precision production processes such as photo lithography.
Starting Page	168
Ending Page	171
File Size	135659
Page Count	4
File Format	PDF
ISBN	9781424472321
e-ISBN	9782874870163
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-28
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	EUROPEAN MICROWAVE ASSOC
Subject Keyword	Directional couplers Impedance Attenuators Monitoring Couplings Radio frequency
Content Type	Text
Resource Type	Article

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