Title :
An Optimized Isolation Network for the Wilkinson Divider
Author :
Tas, Vahdettin ; Atalar, Abdullah
Author_Institution :
Dept. of Electr. & Electron. Eng., Bilkent Univ., Ankara, Turkey
Abstract :
We propose an isolation network to simultaneously improve the input return loss, output return loss and isolation of the Wilkinson power divider in a wide bandwidth. The required even mode and odd mode reflection coefficients of the isolation network are calculated. Constructed even and odd mode circuits are combined to give the desired isolation network. Analytical expressions for the optimal component values for a single-section divider are given. Compared with the single-section Wilkinson divider, the final design can triple the bandwidth for an input-output return loss and isolation of greater than 25 dB. Broadband characteristic is achieved without increasing the number of sections hence extra length and insertion loss are avoided. Wide operation bandwidth of the new divider is verified by experimental results. The proposed method can be applied to a two-section divider, also broadening its bandwidth.
Keywords :
power dividers; Wilkinson power divider; analytical expressions; broadband characteristic; even mode circuits; even mode reflection coefficients; input-output return loss; insertion loss; odd mode circuits; odd mode reflection coefficients; optimal component values; optimized isolation network; single-section Wilkinson divider; two-section divider; Bandwidth; Equivalent circuits; Impedance; Insertion loss; Ports (Computers); Power dividers; Trajectory; Even mode; Wilkinson divider; isolation network; odd mode; reflection coefficients; wideband power divider;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2014.2365533