Analysis of parallel plate mode in slot-coupled microstrip antenna

✍ Scribed by Hisao Iwasaki; Hiroki Shoki; Kazuaki Kawabatas

• Book ID: 102822470
• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 721 KB
• Volume: 76
• Category: Article
• ISSN: 8756-6621
• DOI: 10.1002/ecja.4410760204

✦ Synopsis

In the electromagnetic slotcoupled microstrip antenua in which a triplate transmission line is used and a patch anteMa is fed via a slot on the ground plane, a parallel plate mode ("EM wave) propagating between the ground planes is excited so that a power leakage causes unwanted coupling and radiation.

This paper studies the Poynting power and the electric field of this parallel plate mode. The amount of the parallel plate mode generated and the propagation W v i o r are investigated analytically by means of the Spatial Network Method. The method for installing shorting pins known for their suppression of the parallel plate mode is studied in its relationship to the generation of the parallel plate mode.

A method for placing pins with a least number of pins is proposed. The relationship between the resonance of the parallel plate mode and the external dimensions of the dielectric substrate comprising the triplate transmission line is studied experimentally. It is found that the resonance of the parallel plate mode coincides with that of an open resonator with its dimensions identical to a finite dielectric substrate comprising the triplate transmission line.