Circuit board having a peripheral antenna apparatus with selectable antenna elements and selectable phase shifting
US7498999B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 2005 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Dec 25, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/185
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit board for wireless communications includes communication circuitry for modulating and/or demodulating a radio frequency (RF) signal and an antenna apparatus for transmitting and receiving the RF signal, the antenna apparatus having selectable antenna elements located near one or more peripheries of the circuit board and selectable phase shifting. A switching network couples one or more of the selectable elements to the communication circuitry and provides impedance matching regardless of which or how many of the antenna elements are selected, and includes a selectable phase shifter to allow the phase of the antenna elements to be shifted by 180 degrees. The phase shifter includes a first RF switch and two ¼-wavelength delay lines of PCB traces or delay elements and a second RF switch. The phase shifter selectively provides a straight-through path, a 180 degree phase shift, a high impedance state, or a notch filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.