CAJ | 학술논문

本文介绍了一种小型化超宽带微带带通滤波器。该微带滤波器采用了两个开路枝节线和两个短路枝节线，其中开路枝节和短路枝节两两组成枝节线对。在两个枝节线对之间，利用一段均匀微带线进行连接。滤波器的输入输出采用了直接馈电的设计，以保证宽带滤波器所需的强耦合。作者对该滤波器进行了参数仿真研究，最后设计实现了一个带宽在110%左右的超宽带滤波器。试制样品的测试结果与仿真结果吻合良好。实验结果表明，该滤波器在中心频率为1.90 GHz处，实现了103%的相对带宽。通带内的最小插入损耗为0.20 dB (在1.52 GHz处)，带内匹配均优于-20 dB。第一个寄生通带的频率高于6 GHz，是中心频率的3.2倍左右。该滤波器的电尺寸小，在其通带中心频率处，只有0.21λ g*0.18λg。
본문개소료일충소형화초관대미대대통려파기。해미대려파기채용료량개개로지절선화량개단로지절선，기중개로지절화단로지절량량조성지절선대。재량개지절선대지간，이용일단균균미대선진행련접。려파기적수입수출채용료직접궤전적설계，이보증관대려파기소수적강우합。작자대해려파기진행료삼수방진연구，최후설계실현료일개대관재110%좌우적초관대려파기。시제양품적측시결과여방진결과문합량호。실험결과표명，해려파기재중심빈솔위1.90 GHz처，실현료103%적상대대관。통대내적최소삽입손모위0.20 dB (재1.52 GHz처)，대내필배균우우-20 dB。제일개기생통대적빈솔고우6 GHz，시중심빈솔적3.2배좌우。해려파기적전척촌소，재기통대중심빈솔처，지유0.21λ g*0.18λg。
In this paper, a compact ultra-wideband microstrip bandpass filter based on shunt stubs is introduced. The filter is composed of two pairs of stubs;in each pair, the two stubs are short-and open- ended respectively. The two stub-pairs are connected via a section of uniform microstrip line. A direct coupling topology is applied to realized the feeding, to guarantee the tight coupling for wideband filter. Parametric studies are employed to demonstrate the performance of the filter, and then a ultra-wideband filter with about 110%fractional bandwidth is designed and implemented. The measured result agrees well with the fullwave predictions, which shows the filter has a fractional bandwidth of 103% at the central frequency of 1.90 GHz. The minimal insertion loss is 0.20 dB at 1.52 GHz, when the matching is better than-20 dB within the passband. The first spurious frequency is higher than 6.0 GHz, about 3.2 times of the central frequency. This filter has a compact size in electrical, that is about 0.21λg *0.18 λg at its central operating frequency.