CAJ | 학술논문

文章提出了一种基于终端加载变容管的混合型梳状线谐振器的三阶电调微带带通滤波器，仅采用两个电压源进行控制．根据奇偶模分析方法，推导了混合梳状线谐振器间耦合系数计算公式，通过合理设计级间及输入输出耦合结构，绝对带宽保持恒定的要求可以得到满足．设计了一个调谐范围为1.0GHz～1.78GHz ，3dB绝对带宽为104.5±8MHz的三阶电调滤波器，其插入损耗小于5.7dB ，回波损耗优于16dB ，对二次谐波的抑制达到60dB ．实验结果表明，测试结果与电磁仿真结果基本一致．
문장제출료일충기우종단가재변용관적혼합형소상선해진기적삼계전조미대대통려파기，부채용량개전압원진행공제．근거기우모분석방법，추도료혼합소상선해진기간우합계수계산공식，통과합리설계급간급수입수출우합결구，절대대관보지항정적요구가이득도만족．설계료일개조해범위위1.0GHz～1.78GHz ，3dB절대대관위104.5±8MHz적삼계전조려파기，기삽입손모소우5.7dB ，회파손모우우16dB ，대이차해파적억제체도60dB ．실험결과표명，측시결과여전자방진결과기본일치．
In this paper ,a novel three-pole varactor-tuned bandpass filter using mixed microstrip combline and quasi-combline resonators biased by only two voltages is proposed .The couplings between mixed combline resonators can be controlled so that the constant bandwidth requirement could be satisfied ,and the design theory is analyzed based on odd-and even-mode method in detail .The tunable filter has an almost constant 3-dB absolute bandwidth of 104.5 ± 8MHz from 1.0GHz to 1 .78GHz .Its inser-tion loss varies from 5.7 dB to 4.2 dB with its return loss better than 16dB .By using dissimilar resonators ,the rejection level at sec-ond harmonic is more than 60 dB .The measured results of the fabricated filter show good agreement with the simulated ones .