{"title":"A design of single and multi-section microstrip directional coupler with the high directivity","authors":"Chul-Soo Kim, Jongsik Lim, Dong-Joo Kim, D. Ahn","doi":"10.1109/MWSYM.2004.1338978","DOIUrl":null,"url":null,"abstract":"In this paper, single and two-section microstrip directional couplers are implemented for realizing the high-directivity characteristics. The achievement of the high-directivity with microstrip configuration is carried out by the distributed capacitor to decrease the even and odd mode phase difference. Capacitive compensation is performed by gap coupling of open stub formed in sub-coupled line. Therefore, insertion loss and power handling capability are not affected by the gap coupling. The proposed structure is easy to fabricate and incorporate another microwave device due to planner microstrip. We designed and fabricated single and two-section directional coupler with 20 dB coupling. In spite of microstrip structure, the capacitive compensation structure shows the 30 dB (1.6 GHz-2 GHz range) and 26 dB (1 GHz-2.5 GHz) of directivity in single and two-section directional couplers, respectively. Experimental results show a good performance with excellent directivity characteristics.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"22","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.2004.1338978","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 22
Abstract
In this paper, single and two-section microstrip directional couplers are implemented for realizing the high-directivity characteristics. The achievement of the high-directivity with microstrip configuration is carried out by the distributed capacitor to decrease the even and odd mode phase difference. Capacitive compensation is performed by gap coupling of open stub formed in sub-coupled line. Therefore, insertion loss and power handling capability are not affected by the gap coupling. The proposed structure is easy to fabricate and incorporate another microwave device due to planner microstrip. We designed and fabricated single and two-section directional coupler with 20 dB coupling. In spite of microstrip structure, the capacitive compensation structure shows the 30 dB (1.6 GHz-2 GHz range) and 26 dB (1 GHz-2.5 GHz) of directivity in single and two-section directional couplers, respectively. Experimental results show a good performance with excellent directivity characteristics.
本文采用单段和双段微带定向耦合器实现高指向性特性。微带结构的高指向性是通过分布式电容来实现的，以减小奇偶模相位差。电容补偿是通过在分耦合线路中形成的开路短段的间隙耦合来实现的。因此，插入损耗和功率处理能力不受间隙耦合的影响。由于规划微带，该结构易于制造和集成另一个微波器件。设计制作了20 dB的单段和两段定向耦合器。尽管采用微带结构，但电容补偿结构在单段和两段定向耦合器中分别显示出30 dB (1.6 GHz-2 GHz范围)和26 dB (1 GHz-2.5 GHz)的指向性。实验结果表明，该方法性能良好，具有良好的指向性。
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