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Harmonic suppressed compact wideband branch‐line coupler using unequal length open‐stub units
Author(s) -
Velidi Vamsi Krishna,
Patel Bhavesh,
Sanyal Subrata
Publication year - 2011
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20495
Subject(s) - stub (electronics) , broadband , passband , wideband , harmonics , bandwidth (computing) , microstrip , electrical impedance , physics , electrical engineering , topology (electrical circuits) , acoustics , electronic engineering , engineering , telecommunications , voltage , optics , band pass filter
In this article, the design of a broadband branch‐line coupler (BLC) with reduced size and suppressed harmonic passband response is presented. The proposed approach can be used to replace the low impedance λ/4 lines of the conventional BLC by an equivalent structure almost λ/12 in length. The main advantage of the proposed BLC is that, it has approximately the same bandwidth as that of a conventional BLC. A prototype broadband coupler having fractional bandwidth >50% at 1.1 GHz and of size less than one third of a conventional three‐section wideband BLC topology is realized. In addition, at least 20 dB suppression of up to fourth harmonics is achieved. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.