Transmitter
US6625470B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0483
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dual band transmitter (1) including: a lower band power amplifier (2) and a higher band power amplifier (3), a lower band transmit path (4) between the output of the lower band power amplifier (2) and a combining means (8); and a higher band transmit path (5); between the output of the higher band power amplifier (3) and the combining means (8). A surface mounted device includes a stub (6) having a first (61) and a second (62) end, the first end of the stub (6) being connected to the higher band transmit path (5) and the second end of the stub (6) being coupled to a switch. The second (62) end of the stub (6) is substantially closed or opened, in dependence upon the state of the switch, so that, in use, spurious harmonics are prevented from being generated in, and transmitted from, the transmitter (1).The lower band transmit path (4) incorporates a lower band low pass filter (48) for removing all signals having a frequency greater than or equal to the second harmonic of the lower band wanted signal; and the higher band transmit (5) path includes a higher band low pass filter (58) for removing all signals having a frequency greater than or equal to the second harmonic of the highe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.