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在PON阵型方向回溯天线中,需要在原位消除带通滤波器的固有寄生效应。采用级联L-C等效电路实现的3GHz内的低通特性,在通带2.4-2.5GHz范围内,带内衰减小于2dB,起伏小于1dB,2.2GHz以下以及2.7GHz以上衰减大于40dB,寄生通带处的衰减达到了50dB,有较高的滤波选择性。改变L-C结构的谐振点后,可用于其他频段的PON方向回溯天线。对其他场合下有较高带外抑制要求的混频器、放大器等,级联L-C结构提供了一种新的方法。
In the PON array backdirectional antenna, the inherent parasitic effects of the bandpass filter need to be eliminated in-situ. The low pass characteristic of 3GHz achieved by the cascaded LC equivalent circuit has the attenuation in the band of 2.4-2.5GHz in the band of less than 2dB, the fluctuation of less than 1dB, the attenuation of less than 1dB below 2.2GHz and above 2.7GHz, the parasitic passband Department of attenuation reached 50dB, a higher filtering selectivity. After changing the resonant point of the L-C structure, it can be used for PON direction backdating antennas in other frequency bands. For other occasions have higher requirements of out-band rejection mixer, amplifier, cascaded L-C structure provides a new method.