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    • 1. 发明授权
    • Complete outdoor radio unit for LMDS
    • LMDS的完整室外无线电单元
    • US06640084B2
    • 2003-10-28
    • US09725240
    • 2000-11-29
    • Krishna PandeGuobao ZhengTho NguyenLee PhelpsAli I. BawangaonwalaSunil M. NagabhushanaEric Funk
    • Krishna PandeGuobao ZhengTho NguyenLee PhelpsAli I. BawangaonwalaSunil M. NagabhushanaEric Funk
    • H04H100
    • H04H40/90H01Q1/02H01Q13/0258H01Q23/00H05K1/0237H05K1/142H05K3/0058
    • The complete outdoor radio unit for LMDS is a light weight, compact transceiver featuring planar circuitry. The transceiver uses cross polarization through an orthomodal transducer and frequency offset between transmit and receive to provide isolation between the transmitter and receiver. The transceiver includes three printed circuit boards directly attached by thermally conductive epoxy to a heat sink which forms part of the antenna dish/transceiver housing for effective heat transfer. Two of the waveguides are used as receiver and transmitter transmission lines into the orthomodal transducer, and two of the waveguides are used as bandpass filters. The transceiver also includes a DC—DC converter in the power supply which is modified to connect the base plate to the heat sink for compactness and improved heat transfer, and a frequency synthesizer with a phase locked loop hardwired to a single reference frequency for compact size.
    • 用于LMDS的完整的室外无线电单元是一种重量轻,紧凑的收发器,具有平面电路。 收发器使用交叉极化通过正交模式转换器和发射和接收之间的频率偏移来提供发射机和接收机之间的隔离。 收发器包括三个印刷电路板,其通过导热环氧树脂直接附接到散热器,该散热器形成用于有效传热的天线盘/收发器壳体的一部分。 两个波导用作接收器和发射机传输线进入正交模拟换能器,并且两个波导被用作带通滤波器。 收发器还包括电源中的DC-DC转换器,其被修改以将基板连接到散热器以实现紧凑性和改善的热传递,以及频率合成器,其具有硬连接到单个参考频率的紧凑尺寸的锁相环 。