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11.70～12.20千兆赫参量放大器是为卫星直播电视地面接收站研制的低噪声高放部件.作为边缘低场强地区接收系统低噪声高放部件的单级参放,必须在保证接收带宽的前提下,提供较高的增益,以尽量减小后级噪声贡献,从而实现系统高灵敏度之目的.参量放大器的性能指标是由所用变容管、泵源性能和电路结构形式等因素决定的.为简化电路结构,参放的信号电路和空闲电路应尽量利用变容管的封装参数和集总参数元件,选用变容管的并联谐振频率作为空闲频率,而外空闲电路则由一段λ_i/4短路同轴线组成,此段
11.70 ~ 12.20 gigahertz parametric amplifier is a low-noise high-rise part developed for the satellite live television ground receiving station.As a single-stage gamut of the low-noise high-baying part of the receiving system in the low-field edge region, the receiving bandwidth must be guaranteed , To provide higher gain, in order to minimize the contribution of the subsequent stage noise, so as to achieve the purpose of high sensitivity of the system.The performance index of the parametric amplifier is determined by the factors such as the used varactor, pump performance and circuit structure, Circuit structure, participating signal circuit and idle circuit should make full use of varactor package parameters and lumped parameter components, use the varactor parallel resonant frequency as the idle frequency, while the external idle circuit by a λ_i / 4 short circuit with Axis composition, this section