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针对同轴介质滤波器有限传输零点不易实现的问题,介绍了一种新颖的带陷波特性的介质带通滤波器,由1/4波长的同轴介质谐振器相互耦合,并在任意入出端级联一段吸收网络组合优化而成。该网络在通带外边缘既产生了有限传输零点,又增加了滤波器节数,且可灵活设计零点的位置,对特定的频率进行吸收,具有易装配、易调试、工程实用化强的特点。实例制作的中心频率1.0 GHz、3 dB带宽约30 MHz,50 dB陷波频点975 MHz,仿真设计和实测结果吻合很好。
Aiming at the problem that the finite transmission zero point of coaxial dielectric filter is not easy to be realized, a novel dielectric band-pass filter with notch characteristic is introduced, which is coupled by 1/4 wavelength coaxial dielectric resonator. A cascade of absorption network optimized combination. The network at the outer edge of the passband has a finite transmission of zero, but also increased the number of filter sections, and flexible design of the zero position, to absorb a specific frequency, with easy assembly, easy debugging, engineering and practical features . The center frequency of the example is 1.0 GHz, the bandwidth of 3 dB is about 30 MHz, and the frequency of 50 dB notch is 975 MHz. The simulation results are in good agreement with the measured results.