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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/435


    Title: 振盪器陣列藉由浮動接地網路之同步與相位調控機制探討;Investigation of Synchronization and Phase Tuning in Oscillator Array with Wavy Ground Network
    Authors: 李唐宇;LEE, TANG-YU
    Contributors: 電機工程研究所
    Keywords: 浮動接地網路;耦合振盪器陣列;本地端相移器;波束成形;Wavy Ground Structure;Coupled Oscillator Array;Local Phase-Shifting;Beamforming
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 電機工程研究所
    Abstract: 此論文研究新型態之耦合架構,以簡單之共地耦合路徑與地端電感將參考地與大地分開,使電壓訊號於電感性的平台之上做波動,形成浮動接地網路,再藉由此耦合網路之特性,達成振盪器相互鎖定與調控電壓控制相位之機制,然後形成每路天線所需相位,產生波束成形之效果。 起初以理論與模擬,觀察浮動接地網路實現的可能性與特性,整理出在浮動接地網路上,兩振盪器之間距將影響其起始相位狀態,一種為同相位同步(In-Phase),另一種為反相位同步(Anti-Phase)。 電路以同相位同步作為浮動接地網路上振盪器間距設計之原則,並驗證1×2浮動接地振盪器是否能達到相互鎖定與相位調控,量測結果為-67.5° ~ 74.6° (@ 2.3 GHz)及-73° ~ 72° (@ 1.6 GHz),輸出功率皆為10 dBm,輸出功耗皆為2 × 5V × 21 mA = 210 mW,有達到相互鎖定與相位調控之特性。 為延伸相位調控之功能,利用兩組浮動接地振盪器來模擬中頻端與本地端之訊號源,以固定中頻相位情形下,調整本地端壓控振盪器,來達成本地端相移器之功能,量測結果於1×2可達到波束掃動範圍為-30°~23°,於1×3可達到波束掃動範圍為-28°~24°。
    The thesis put forward a brand-new structure of coupling network. The coupling network contains a reference ground of the circuit and an inductor which is the only connection between the reference ground and the earth ground. This kind of coupling network is called “Wavy Ground Network”. By the characteristic of coupling in the wavy ground structure, the voltage controlled oscillators, which are connected to the reference ground of the structure, will have the phenomenon of the injection locking.Under the situation of locking, the variation of tuning voltage will transform to the difference of phase between VCOs, while the free-running frequency does not exceed the locking range of the circuit. Therefore, the phase difference of the output signal will steer the beam to wanted directions. At first, the simulation of the wavy ground structure should be concerned to predict the feasibility and the characteristic. By the results of the simulation, there are two kinds of the situations about the initial phase difference between the output signals which are caused by the distance between VCOs. One of the situation is the in-phase mode of synchronization, another is the anti-phase mode of synchronization. The on-board circuit will be designed with the rule of in-phase mode of synchronization. The circuit will be confirmed that if it will have mutual-locking phenomenon and phase-shifting function. The measurement result as below : Phase tuning range is -67.5°~74.6°at 2.3 GHz, and -73°~72° at 1.6 GHz. Both of the output power is 10 dBm. The power consumption is 210 mW. To extend the function of the phase tuning, there are two set of the wavy ground structure to pretend to be the IF signal and LO signal. While the phase difference of the IF signal is fixed to zero, the variation of the tuning voltage at local VCO will cause the phase shifting. The measurement result of the beam swapping range is -30°~23°.
    Appears in Collections:[電機工程研究所] 學位論文

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