附件一報告撰寫格式及樣本-免費閱讀
【正文】 hybridring coupler with twinspiral type phase inverter. The singlespiral type hybridring coupler has the same circuit layout except that the twinspiral type phase inverter is replaced by the 5 singlespiral one. The impedance of the ring is given by oring ZZ 2? , where 0Z is the port impedance which is chosen as ?75 . The length of each arm is quarter wavelength at the center frequency and the dimensions of both phase inverters are the same as those of Fig. 1. The bondwires at the Tjunctions are used to suppress the undesired coupled slotline mode generated at these discontinuities. In this study, both singlespiral and twinspiral type hybridring couplers are designed at center frequency 2GHz and fabricated on the FR4 substrate. In simulation, the coupler (fourport work) is divided into four Tjunctions (threeport works) and four twoport works. These twoport and threeport works are simulated separately by the IE3D software and the results are cascaded and bined to analyze the performance of the hybridring coupler. The measured and simulated results of the hybridring coupler with singlespiral type phase inverter are shown in Fig. 4. The measured results agree well with the simulated ones. Fig. 5 shows the simulated and measured results for the hybridring coupler with twinspiral type phase inverter. The isolation between Eport and Hport is greater than 30dB at center frequency, and is greater than 15dB from 1GHz to . The Hport power dividing unbalance is less than 1dB from 1GHz to , and the Eport power dividing unbalance is less than 1dB from GHz to GHz. The inphase and outofphase phase differences are less than 15176。文書系統(tǒng)請使用 Microsoft Word，最後並應提供印出紙版及電腦檔案。版面設定為上下左右各留 3cm，紙張大小為 A4，頁次標示在頁尾中，標法請依分項計畫各工作項目 (或子項目 )頁次格式，如 1, – 2(或 ,)等。from 1GHz to and 1GHz to , respectively. The bandwidth of twinspiral type hybridring coupler is 40% which is larger than that (33%) of singlespiral type hybridring coupler. These results indicate that the performance of the hybridring coupler is mainly determined by the performance of the associated phase inverter. 6 CONCLUSION In this study, novel uniplanar 180o hybridring couplers with singlespiral and twinspiral type uniplanar phase inver
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