Network analysis and synthesis of multislot back-to-back microstrip directional couplers

Authors
Citation
Jp. Kim et Ws. Park, Network analysis and synthesis of multislot back-to-back microstrip directional couplers, IEEE MICR T, 48(11), 2000, pp. 1935-1942
Citations number
18
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
ISSN journal
00189480 → ACNP
Volume
48
Issue
11
Year of publication
2000
Part
1
Pages
1935 - 1942
Database
ISI
SICI code
0018-9480(200011)48:11<1935:NAASOM>2.0.ZU;2-N
Abstract
This paper develops a method to analyze and synthesize multislot back-to-ba ck microstrip directional couplers, The analysis is based on an equivalent four-port network of the coupler, where the slot is represented by a lumped reactance connected in series with the microstrip lines through ideal tran sformers. The reactance and turn-ratio values are computed by network analy sis, taking into account the structure parameters of the slot, such as its length, inclination angle, and offset distance. The characteristics of the directional coupler are calculated by using even- and odd-mode analysis. Af ter deriving synthesis equations for uniform multislot couplers, an approxi mation scheme is devised for nonuniform directional couplers by combining t he loose coupling theory with an optimization process. Several different un iform and nonuniform couplers are then explored, and their results are show n as accurate.