带内波动、带外抑制特性的改善。
另外，在函数类型上使用椭圆函数型，使带外出现有限频率传输零点，进一步提高了带外抑制能力。
In addition, the stop-band rejection can be further increased by using elliptic filter function which has limited frequency transmission zeros.
这种滤波器采用灵活的拓扑结构和耦合结构，可以实现传输零点，从而提高滤波器带外抑制特性，或者使群时延更加平坦。
Flexible topology and coupling structures are used to realize transmission zeros, thereby enhancing the stop band rejection or making more flat group delay.
准椭圆函数滤波器的传输零点，可以位于阻带内的任意位置处，这能更加灵活地对滤波器的带外抑制度进行调节，其矩形系数可以做得很高。
The transmission zeros(TZ) of Quasi-elliptic function filter could be placed in any position, so the attenuation out of band is controllable, then a high selection performance could get.
放大器的输出接有滤波器，可有效抑制带外谐波和无用发射分量。
The output of Amplifier has a filter, which can inhibit the out-off-band harmonic waves and unwanted emission component.
放大器的输出接有滤波器，可有效抑制带外谐波和无用发射分量。
The output of Amplifier has a filter, which can inhibit the out-off-band harmonic waves and unwanted emission component.
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