In this paper it is shown for the first time that a novel transition may occur for dominant ( quasi transverse electromagnetic (quasi-TEM)) leaky modes on microstrip line, between a leaky mode that leaks into the TM0 surface wave mode and one that leaks both into the surface wave and into space. The modal evolution of leaky modes as a function of frequency is studied by means of a full-wave spectral domain approach, and it is shown that such transitions occur on microstrip lines that have a critical strip width, which is relatively large. When the strip width is equal to the critical value, a transition frequency will exist at which the attenuation constant of the leaky mode drops exactly to zero and the leaky mode has a real propagation wave number exactly equal to the free-space wave number. At this frequency, the leaky mode transitions from one that leaks into only the surface wave to one that also leaks into space. In a frequency neighborhood of the transition frequency, very large spurious effects may be produced because of interference between the fundamental quasi-TEM mode and the continuous spectrum current.

Baccarelli, P. (2005). Direct modal transition from space-wave to surface-wave leakage on microstrip lines. RADIO SCIENCE, 40, RS6017-1-RS6017-14 [10.1029/2005RS003286].

Direct modal transition from space-wave to surface-wave leakage on microstrip lines

BACCARELLI, PAOLO
2005

Abstract

In this paper it is shown for the first time that a novel transition may occur for dominant ( quasi transverse electromagnetic (quasi-TEM)) leaky modes on microstrip line, between a leaky mode that leaks into the TM0 surface wave mode and one that leaks both into the surface wave and into space. The modal evolution of leaky modes as a function of frequency is studied by means of a full-wave spectral domain approach, and it is shown that such transitions occur on microstrip lines that have a critical strip width, which is relatively large. When the strip width is equal to the critical value, a transition frequency will exist at which the attenuation constant of the leaky mode drops exactly to zero and the leaky mode has a real propagation wave number exactly equal to the free-space wave number. At this frequency, the leaky mode transitions from one that leaks into only the surface wave to one that also leaks into space. In a frequency neighborhood of the transition frequency, very large spurious effects may be produced because of interference between the fundamental quasi-TEM mode and the continuous spectrum current.
Baccarelli, P. (2005). Direct modal transition from space-wave to surface-wave leakage on microstrip lines. RADIO SCIENCE, 40, RS6017-1-RS6017-14 [10.1029/2005RS003286].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/327825
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