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International Journal of Antennas and Propagation
Volume 2016, Article ID 7964528, 7 pages
Research Article

An ANN-Based Synthesis Model for Parallel Coupled Microstrip Lines with Floating Ground-Plane Conductor and Its Applications

1School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning 116026, China
2School of Electrical and Control Engineering, Liaoning Technical University, Huludao, Liaoning 125105, China
3School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received 15 October 2015; Revised 2 February 2016; Accepted 11 February 2016

Academic Editor: Diego Masotti

Copyright © 2016 Yuan Cao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To directly obtain physical dimensions of parallel coupled microstrip lines with a floating ground-plane conductor (PCMLFGPC), an accurate synthesis model based on an artificial neural network (ANN) is proposed. The synthesis model is validated by using the conformal mapping technique (CMT) analysis contours. Using the synthesis model and the CMT analysis, the PCMLFGPC having equal even- and odd-mode phase velocities can be obtained by adjusting the width of the floating ground-plane conductor. Applying the method, a 7 dB coupler with the measured isolation better than 27 dB across a wide bandwidth (more than 120%), a 90° Schiffman phase shifter with phase deviation ±2.5° and return loss more than 17.5 dB covering 63.4% bandwidth, and a bandpass filter with completely eliminated second-order spurious band are implemented. The performances of the current designs are superior to those of the previous components configured with the PCMLFGPC.