Title:
TRANSMIT NETWORK FOR A CELLULAR BASE-STATION
Document Type and Number:
WIPO Patent Application WO2002082581
Kind Code:
A3
Abstract:
A transmit network for cellular mobile radio networks incorporates tow transmit multiplexers (122ABE) and (122CD): the first transmit multiplexer 122ABE receives a group of output signals from three transmitters (124A, 124B and 124E), and filters them in respective band-pass filters (126A, 126B and 126E); the second transmit multiplexer (122CD) receives a group of output signals from two further transmitters (124C and 124D), and filters them in respective band-pass filters (126C and 126D). The transmit frequencies in each signal group are non-adjacent, which improves isolation between transmitters provided by the filters (126). Filtered output signals from respective band-pass filters (126) are combined at filter outputs (128X and 128Y) from which signals are combined in a combiner (132) providing a degree of isolation between these outputs and enabling the signals to be combined with minimal distortion. Signals from the combiner (132) are fed via a duplexer to a transmit/receive antenna.
Inventors:
NIMMO-SMITH NORMAN RICHARD (GB)
Application Number:
PCT/GB2002/001401
Publication Date:
February 20, 2003
Filing Date:
March 22, 2002
Export Citation:
Assignee:
QINETIQ LTD (GB)
NIMMO-SMITH NORMAN RICHARD (GB)
NIMMO-SMITH NORMAN RICHARD (GB)
International Classes:
H04J11/00; H01Q21/30; H04B1/04; H04W88/08; (IPC1-7): H04Q7/36
Foreign References:
| US5584058A | 1996-12-10 | |||
| US5229729A | 1993-07-20 |
Other References:
See also references of EP 1374616A2
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