Low profile tunable circularly polarized antenna
US6339402B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna assembly for a wireless communication device. The antenna assembly is mountable onto a printed wiring board (PWB) and consists of first and second conducting elements. The first conducting element is capacitively coupled via a matchable shunt and operatively connected to a ground plane of the PWB, while the second conducting element is operatively connected to the ground plane of the PWB at two locations. The first and second conducting elements are operatively connected to each other by a tunable bridge capacitor and together form two orthogonal magnetic dipole elements. The antenna assembly provides substantially circular hemispherical polarization over a wide range of amplitudes by virtue of the geometry and orientation of the two magnetic dipole elements which are fed with equal amplitude, but in-phase quadrature. The matchable shunt acts as an impedance transformer to yield a low voltage standing wave ratio (VSWR) of less than two-to-one at the operating frequency. The antenna assembly includes a single feed point which permits RF energy to be distributed to both conducting elements without a power splitter or phase shifter(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.