Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2008-05-23
2010-11-23
Takaoka, Dean O (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S117000
Reexamination Certificate
active
07839235
ABSTRACT:
A feed network device, an antenna feeder subsystem, and a base station system are provided. The feed network device comprises: two first stage couplers, two phase shifters, and two second stage couplers cascaded on a Printed Circuit Board, wherein each coupler is a multilayered dielectric broad-side coupler, and the difference of phase between an output signal at the coupling port and an output signal at the direct connection port is 90° in each multi-dielectric broad-side coupler.
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Xiong Xianzhi
Yuan Wenxin
Huawei Technologies Co. Ltd.
Takaoka Dean O
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