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
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.