本文選題：四次諧波混頻器 + 變頻損耗��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：在高頻系統(tǒng)尤其是毫米波系統(tǒng)中,高頻本振源的研制難度較大,要獲得高性能系統(tǒng),變頻部分的一種可行方案是采用諧波混頻技術(shù)。諧波混頻技術(shù)可以有效降低本振源的研制難度,因而在實(shí)際工程中得到廣泛應(yīng)用。由于混頻器的變頻損耗、鏡頻抑制度、噪聲系數(shù)等指標(biāo)直接影響系統(tǒng)的整體性能,因此,對混頻器的研究具有重要意義。本文通過分析近年來國內(nèi)外高次諧波混頻器的研究進(jìn)展,并結(jié)合課題要求,研制工作在K波段的四次諧波低中頻混頻器。射頻(RF)頻率為24.07 GHz,本振(LO)頻率為6.0 GHz。本課題的最終目標(biāo)是研制低變頻損耗的小型化四次諧波混頻電路,具體內(nèi)容有:1)混頻方案、元部件的選取以及電路總體布局研究:包括比較并確定混頻類型和采用的混頻器件等。2)過耦合器的研究:為使RF與LO之間的隔離度高而且RF與LO信號(hào)有效加載至混頻元件,文中采用了一種具有特定功能的耦合線過耦合器分別作為RF與LO信號(hào)的輸入,同時(shí)實(shí)現(xiàn)LO與RF端口之間的良好隔離。3)閑置頻率信號(hào)的處理:對四次諧波混頻,為提高能量利用效率,減小混頻器變頻損耗,應(yīng)對未參與混頻的RF、LO以及二次閑頻信號(hào)合理處置。4)中頻(IF)信號(hào)的提取方案:為有效提取出IF信號(hào)并使IF輸出端口與本振、射頻端口隔離度高,需對IF濾波網(wǎng)絡(luò)進(jìn)行研究和設(shè)計(jì)。5)本振與射頻回路以及輸入匹配網(wǎng)絡(luò):根據(jù)電路布局需要,設(shè)計(jì)了一種變形扇形枝節(jié)來實(shí)現(xiàn)本振與射頻回路,匹配網(wǎng)絡(luò)部分則采用了平衡短截線實(shí)現(xiàn)電路的匹配。6)四次諧波混頻器電路仿真得到的變頻損耗最低僅6.3 dB,變中頻工作與固定中頻工作時(shí)變頻損耗10 dB以下帶寬分別可達(dá)1.2 GHz與2.7 GHz,且各端口之間有著較高隔離特性同時(shí)電路整體尺寸也進(jìn)一步減小。7)作為本碩士論文的進(jìn)一步拓展,通過在0-dB耦合器射頻直通端口加載λ/4@4fLO開路枝節(jié)和PIN開關(guān)以及相應(yīng)的直流偏置網(wǎng)絡(luò),通過控制開關(guān)的通斷狀態(tài),可設(shè)計(jì)成一種具有多種工作狀態(tài)的諧波混頻器。
[Abstract]:In the high frequency system, especially in the millimeter wave system, the development of the high frequency local oscillator is difficult. To obtain the high performance system, a feasible scheme of the frequency conversion part is to adopt the harmonic mixing technology. Harmonic mixing technology can effectively reduce the difficulty of local oscillator development, so it is widely used in practical engineering. Because the frequency conversion loss, mirror frequency rejection and noise coefficient of mixer directly affect the overall performance of the system, it is of great significance to study the mixer. By analyzing the research progress of high order harmonic mixers at home and abroad in recent years, and combining with the requirements of the subject, the fourth harmonic low if frequency mixer working in K band is developed in this paper. The RF frequency is 24.07 GHz and the local oscillator frequency is 6.0 GHz. The ultimate goal of this project is to develop a miniaturized fourth harmonic frequency mixing circuit with low frequency conversion loss. The selection of components and the study of the overall layout of the circuit: including the study of comparing and determining the type of mixing and the unit of mixer etc. 2) over coupler: in order to make the isolation between RF and Lo high and the RF and Lo signals loaded into the mixing element effectively, In this paper, a coupling line over-coupler with special function is used as the input of RF and Lo signals respectively, and the good isolation of idle frequency signals between Lo and RF ports is realized at the same time. In order to improve the efficiency of energy utilization and reduce the frequency conversion loss of mixer, we should deal with the extraction scheme of RFLO and if (4) if signal without mixing: in order to extract if signal and make if output port and local oscillator effectively, RF port isolation is high, we need to study and design if filter network. 5) Local oscillator, RF loop and input matching network: according to the layout of the circuit, a deformed sector branch is designed to realize the local oscillator and RF loop. In the part of matching network, the balanced truncation line is used to realize the matching of circuit. 6) the fourth harmonic mixer circuit has the lowest frequency conversion loss of 6.3 dB, and the frequency conversion loss is less than 10 dB bandwidth when variable intermediate frequency operation and fixed intermediate frequency operation. It can reach 1.2 GHz and 2.7 GHz, with higher isolation between ports and a further decrease in overall circuit size (.7) as a further development of the Master's thesis. By loading 位 / 4FLO open branch and PIN switch and the corresponding DC bias network at the RF through port of the 0-dB coupler, a harmonic mixer with multiple working states can be designed by controlling the on-off state of the switch.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN773

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