Design of lange coupler for MIC and MMIC technology using complementary deformed omega structure

Abstract

A novel design for a 3 dB Lange coupler based on complementary deformed omega structure (CDOS) is proposed. Observations, from parametric study for the CDOS based Lange coupler, are provided to aid in the design process. A functional linked artificial neural network has been used to determine the dimensions of the CDOS. Electromagnetic simulations have been validated with experimental results obtained from fabricated prototypes. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22:85-92, 2012.

Wideband 3-dB broadside-coupled CPW coupler with ACPW and DGS for directivity enhancement

“…As we know, it is very difficult to realize 3‐dB couplers using single coupled microstrip line. To obtain a tight coupling in the range of 3‐6 dB, the Lange and tandem coupler configurations were proposed. However, they require wire crossovers, which arouse parasitic effects at high frequencies and are inconvenient from the manufacturing point‐of‐view.…”

“…The proposed couplers can be easily realized on a single‐layer substrate by using common PCB processes and is compatible with microstrip circuits. Comparisons of the proposed structures with the other reported 3‐dB couplers are summarized in Table . The advantages of the proposed couplers are as follows: (1) no wire crossovers are needed; (2) it can be fabricated on a single‐layer substrate; (3) two‐finger coupled lines are used; and (4) the slot‐ and strip‐width of coupled lines can be increased.…”