发明名称 |
Dual-polarity low-noise block downconverter systems and methods |
摘要 |
Methods and systems are provided for spectrally separating first and second satellite signals that occupy a common frequency band with different first and second electromagnetic polarizations. These systems and methods facilitate the use of inexpensive single-cable distribution networks to simultaneously deliver all transmitted channels of a satellite communication system to a plurality of subscriber locations. In particular, a frequency-converter system is provided that includes first and second low-noise block downconverters whose outputs are coupled into an output diplexer. The low-noise block downconverters each have a downconverter mixer and a local oscillator that couples a local oscillator signal to the mixer but the local oscillator signals are sufficiently spaced apart to convert the first and second satellite signals to spectrally spaced first and second intermediate-frequency (IF) bands. The IF bands are isolated because they are spectrally separated. Accordingly, they can be combined in the diplexer and distributed to subscribers over an economical single-cable distribution network.
|
申请公布号 |
US6424817(B1) |
申请公布日期 |
2002.07.23 |
申请号 |
US19980148913 |
申请日期 |
1998.09.04 |
申请人 |
CALIFORNIA AMPLIFIER, INC. |
发明人 |
HADDEN IAN;BUCHAN BRUCE J. |
分类号 |
H04B7/185;(IPC1-7):H04B7/14 |
主分类号 |
H04B7/185 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|