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微带线滤波器的应用十分广泛,它在通信系统、电子系统、医疗设备以及军事微波系统中都发挥着重要的作用。在无线通信系统中,为了抑制外部信号以及混频器、振荡器等器件产生的高次谐波,提高接收机的灵敏度,要求滤波器具有良好的带外抑制能力。传统微波滤波器的频率响应在离开主通带一定距离(通常是主通带中心频率的整数倍)处存在寄生通带,不适合要求有较高抑制带宽的应用场合,因此研究设计具有谐波抑制功能的微波滤波器具有很强的实际意义。
The application of microstrip line filter is very wide, it plays an important role in communication system, electronic system, medical equipment and military microwave system. In the wireless communication system, in order to restrain the external signal and the harmonic wave produced in the mixer, oscillator and other devices, improve the sensitivity of the receiver, require the filter to have good out-of-band rejection ability. Traditional microwave filters have a parasitic passband at a distance from the main passband (usually an integral multiple of the main passband center frequency) and are not suitable for applications requiring a high rejection bandwidth. Therefore, the design of harmonics Suppression microwave filter has a strong practical significance.