| 摘要: | 本論文主要研究與設計微小化之毫米波混波器，與以駐波方式實現的振盪器，加上其相關被動元件。論文內混波器主要架構為次諧波電阻性，頻率操作在28GHz，應用於LMDS系統;振盪器是用交錯耦合之電晶體補償共面帶線(CPS)共振腔損耗，以駐波方式取代傳統行波設計方式，應用在SONET光通訊網路(43GHz)。兩者是以WIN 0.15μm pHEMT製程研製;而被動元件則是利用Al2O3薄膜製程，實現共面波導(CPW)殘段(stub)的微小化與寬頻匹配，進而利用等效電感電容的串並接殘段實現微小化帶通濾波器，以及使用槽線(slotline)模態或是共面波導模態饋入的共振腔。殘段的微小化是用電容補償方式與將殘段折至訊號線內，降低插入損耗（insertion loss）;共振腔是利用二分之波長的環形(ring)槽線代替長方形以縮小尺寸。經由量測，電阻性次諧波混波器的轉換損耗（conversion loss）為12 dB，輸入1 dB壓縮點為9 dBm，訊號隔離度大於30 dB；駐波壓控振盪器相位雜訊（phase noise）在偏離中心頻率1MHz為-101 dBc/Hz，輸出功率為6 dBm，可調頻率範圍為1GHz；毫米波帶通濾波器的尺寸縮小35﹪，介入損耗小於3dB，反射損耗大於15dB，有10GHz頻寬;共面波導並聯短路殘段，尺寸縮小25﹪，介入損耗小於3dB，反射損耗大於9dB，有5.7GHz頻寬；共面波導並聯開路殘段，尺寸縮小25﹪，介入損耗大於15dB，反射損耗小於1dB，有7GHz頻寬；共面波導模態饋入環形共振腔介入損耗大於15dB，反射損耗小於2.5dB，有10GHz頻寬；槽線模態饋入環形共振腔介入損耗大於14dB，反射損耗小於2.5dB，有1.5GHz頻寬。 This thesis investigates millimeter-wave mixer, oscillator and theirs correlated passive circuits. The topology of mixer is resistive type with the center frequency of 28GHz. The topology of local oscillator is cross-coupled scheme and its negative resistance is designed to compensate the loss of tapped resonator with the center frequency of 43GHz. Then the signal can be taken out by standing wave mode. These active circuits are implemented with WIN 0.15μm pHEMT. The millimeter-wave resonators and filters are fabricated with Al2O3 thin film process. The λ/4 shunt and series matching stubs are intentionally placed inside the center conductor to reduce the size and insertion loss of CPW filter. The λ/2 ring resonators replace the conventional rectangular resonators to reduce the size. The measured results of millimeter-wave circuits are as follows; for the sub-harmonic mixer, conversion loss is 12 dB, input power at the 1-dB gain compression point is 9 dBm, isolations among all ports are greater than 30dB; for the standing wave voltage-controlled oscillator, the operating frequency is 43 GHz, the phase noise is -101 dBc/Hz at 1MHz offset frequency, output power is 6 dBm, tuning range is 1 GHz; for the millimeter-wave band pass filter, insertion loss is smaller than 3dB, return loss is larger than 15dB, size is reduced to 35﹪, bandwidth is 10 GHz; for the CPW shunt short stub, insertion loss is smaller than 3dB, return loss is larger than 9dB, size is reduced to 25﹪, bandwidth is 5.7 GHz; for the CPW shunt open stub, insertion loss is larger than 15dB, return loss is smaller than 1dB, size is reduced to 25﹪, bandwidth is 7 GHz;for the CPW feed ring resonator, insertion loss is larger than 15dB, return loss is smaller than 2.5dB, bandwidth is 10 GHz; for the slotline feed ring resonator, insertion loss is larger than 14dB, return loss is smaller than 2.5dB, bandwidth is 1.5 GHz. |
