Quasi-TEM Wave Characterization Method for Tightly Coupled Microstrip Lines with Conductor Overlay

Masayuki NAKAJIMA  Eikichi YAMASHITA  

IEICE TRANSACTIONS (1976-1990)   Vol.E73   No.6   pp.959-967
Publication Date: 1990/06/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology

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A quasi-TEM wave characterization method is proposed for tight couplers which are constructed of coupled microstrip lines with conductor overlay. The characterization is carried out with consideration for strip conductor thickness by applying the rectangular boundary division method and a sequential optimization procedure. Estimated characteristics of a quarter-wavelength tight coupling section are given in the graphical form for the design of structural dimensions. A trial 3-dB hybrid coupler is designed with this method and its measured characteristics are compared with theoretical ones.