Existence of a leaky dominant mode on microstrip line with an isotropic substrate: theory and measurements

A newly discovered leaky dominant mode is reported for conventional microstrip line on an isotropic substrate, at higher frequencies. The existence of this leaky mode has been confirmed both numerically and experimentally. This new mode exists independently of, and in addition to, the customary bound dominant mode. It leaks power away from the line into the fundamental TM/sub 0/ surface wave of the surrounding grounded substrate, and may therefore be responsible for spurious microstrip circuit performance at higher frequencies. This could have important implications for millimeter-wave circuits.

[1]  David R. Jackson,et al.  Proper and improper dominant mode solutions for a stripline with an air gap , 1993 .

[2]  Krzysztof A. Michalski,et al.  Rigorous analysis of open microstrip lines of arbitrary cross-section in bound and leaky regimes , 1989 .

[3]  T. Itoh.  Numerical techniques for microwave and millimeter-wave passive structures , 1989 .

[4]  Mikio Tsuji,et al.  Dominant mode power leakage from printed‐circuit waveguides , 1991 .

[5]  A. A. Oliner,et al.  The Nature of the Leakage from Higher Modes on Microstrip Line , 1986, 1986 IEEE MTT-S International Microwave Symposium Digest.

[6]  D. M. Pozar,et al.  Full-wave spectral-domain computation of material, radiation, and guided wave losses in infinite multilayered printed transmission lines , 1991 .

[7]  David R. Jackson,et al.  Leakage of the stripline dominant mode produced by a small air gap , 1992, 1992 IEEE Microwave Symposium Digest MTT-S.

[8]  Mikio Tsuji,et al.  The nature of the spectral gap between bound and leaky solutions when dielectric loss is present in printed-circuit lines , 1993 .

[9]  Rolf H. Jansen,et al.  Spectral Domain Investigation of Surface Wave Excitation and Radiation by Microstrip Lines and Microstrip Disk Resonators , 1983, 1983 13th European Microwave Conference.

[10]  Mikio Tsuji,et al.  Printed-circuit waveguides with anisotropic substrates: a new leakage effect , 1989, IEEE MTT-S International Microwave Symposium Digest.

[11]  T. Itoh.  Spectral Domain Immitance Approach for Dispersion Characteristics of Generalized Printed Transmission Lines , 1980 .