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    • 3. 发明授权
    • Compact antenna system
    • 紧凑型天线系统
    • US4369518A
    • 1983-01-18
    • US211314
    • 1980-11-28
    • John M. Olson
    • John M. Olson
    • H01Q1/24H03F3/60H04H1/00H04B1/18
    • H01Q1/247H03F3/60
    • A compact antenna system for use in connection with pay television reception comprises a resonant cavity including a small dipole, the latter being connected to a circuit board containing circuitry for converting the received pay television signal to a frequency usable by the television receiver of the subscriber. The member defining the cavity is affixed to the circuit board, which in turn is mounted upon a holder attached to the exterior of the structure in which the television receiver is located. The circuit board includes a preamplifier-filter stage to filter extraneous signals and to promote preamplification of the signal from the antenna. The preamplified signal goes to the input of a mixer and from there is filtered to the frequency of the channel selected by the user of the television receiver. At least one triangular circuit element is utilized in the preamplifier and in the mixer.
    • 用于付费电视接收的小型天线系统包括谐振腔,其包括小偶极子,该谐振腔被连接到电路板,该电路板包含用于将所接收的付费电视信号转换成可由用户的电视接收机使用的频率的电路。 限定空腔的构件固定到电路板,电路板又安装在附接到电视接收机所在结构外部的保持架上。 电路板包括前置放大器滤波器级,以过滤外部信号并促进来自天线的信号的前置放大。 前置放大信号进入混频器的输入端,并从滤波器输出到由电视接收机的用户选择的频道的频率。 在前置放大器和混合器中使用至少一个三角形电路元件。