Microstrip antenna system having nonconductively coupled feedline
US4477813A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1982 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Aug 11, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/065
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microstrip antenna system having one or more conductively isolated resonantly dimensioned radiator structures disposed less than about one-tenth wavelength above a ground plane is nonconductively coupled to an intermediate layer of microstrip feedline structure. The microstrip feedline structure includes various microstrip transmission line segments fed with reference to the ground plane and including predetermined coupling locations positioned an odd integer number of one-fourth wavelength(s) from an effective r.f. short circuit to the underlying ground plane. Such coupling locations are also disposed proximate a predetermined corresponding feedpoint region of the radiating structure such that electromagnetic fields concentrated at the coupling location operate to nonconductively couple r.f. energy to/from the radiator structure from/to the feedline structure. The coupling location is preferably disposed at a widened and relatively lowered r.f. impedance coupling tab segment of the transmission line having a width dimension which is sufficient to provide matched impedance coupling to the corresponding feedpoint region but which is also substantially less than the dimension of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.