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Design and Fabrication of Ka-Band NRD Guide Filter with Newly Designed Inductive Post Structure  

김영수 (엔알디(주))
류원렬 (엔알디(주))
유영근 (엔알디(주))
최재하 (울산대학교 전기전자 및 자동화공학부)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.4, 2003 , pp. 369-376 More about this Journal
Abstract
In this paper, Ka-Band NRD guide band pass filter with newly designed inductive post structure is proposed and analyzed with its test results. Generally, millimeter-wave filters are very sensitive in their physical dimensions, hence, it is requires extreme precisions of several micron so as to get the designed performance. In case of common NRD Guide filter with air gap coupled structure, it is fabricated with dielectric blocks coupled via air gap. In these structures, however, it was not easy to fabricate and to process of each NRD guide dielectric resonator blocks using PTFE, so it was almost impossible to assemble with several microns in precision. In this our research, however, each dielectric resonators are coupled with a pair of inductive metal post, so all resonators are located in a single NRD Guide. The dielectric parts between two pairs of posts are operated as resonators of each stage, and the positions of the post decide the couplings between resonators. The structure we suggested is suitable fur mass production, because it is very simple and easy to process. As a result of measurements, designed NRD guide inductive post filter has a superior performance. The center frequency is 39.475 GHz with 350 MHz bandwidth, insertion loss is less than 1.8 dB, and the return loss is below than -18 dB.
Keywords
Millimeter-Wave; NRD Guide Filter; Inductive Post;
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