NDLI: Impedance-Transforming Symmetric and Asymmetric DC Blocks

Content Provider	IEEE Xplore Digital Library
Author	Hee-Ran Ahn Itoh, T.
Copyright Year	1963
Abstract	Design formulas of symmetric and asymmetric dc blocks are presented for achieving Chebyshev and Butterworth frequency responses. They can also be used for impedance transformers. Design formulas of symmetric dc blocks are first derived and those of asymmetric dc blocks are also computed based on the symmetric ones. For easy derivation of design formulas of the symmetric dc blocks, coupling coefficient, being proportional to bandwidth, is defined. It is then clarified that symmetric Chebyshev dc blocks are not possible for the impedance transforming. For the symmetric Butterworth dc blocks, three design methods are exploited. To verify the symmetric Butterworth dc blocks, a microstrip dc block with 50- and 25-Ω termination impedances designed at a center frequency of 2 GHz was fabricated. The measured S₁₂ = S₂₁ and S₁₁ = S₂₂ are - 0.19 and - 57 dB around 2 GHz, showing quite good agreement with simulation results. Based on synthesized symmetric dc blocks, the coefficients of transfer function \|S₁₂\|² are calculated and design formulas of the asymmetric dc blocks are derived based on the symmetric ones. Asymmetric Chebyshev dc blocks are verified by the measurements provided in a previously published paper and asymmetric Butterworth dc blocks by the symmetric Butterworth dc block measured in this paper.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	2463
Ending Page	2474
Page Count	12
File Size	1025300
File Format	PDF
ISSN	00189480
Volume Number	58
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chebyshev approximation Impedance Mathematical model Couplings Equations Transmission lines Equivalent circuits symmetric and asymmetric dc blocks Impedance-transforming dc blocks Chebyshev and Butterworth types of dc blocks coupled-line dc blocks impedance transformers
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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