【摘要】：隨著半導(dǎo)體工藝的發(fā)展,單片功率放大器性能在不斷提高。但是在毫米波頻段單個(gè)功率放大器芯片的輸出功率仍不能完全滿足系統(tǒng)需要,因此基于固態(tài)放大器的高功率合成技術(shù)一直是毫米波領(lǐng)域研究的熱點(diǎn),同時(shí)也是本文研究重點(diǎn)。本文的主要成果有:1設(shè)計(jì)了兩種新型的寬帶矩形波導(dǎo)到圓波導(dǎo)01TE模的模式轉(zhuǎn)換結(jié)構(gòu):第一種是兼顧marine型與花瓣形的寬帶模式轉(zhuǎn)換器,這種電路結(jié)構(gòu)帶寬寬,體積小,兼具marine型以及花瓣形模式轉(zhuǎn)換器的優(yōu)勢(shì)。在30-40GHz的頻帶內(nèi),圓波導(dǎo)端口01TE模式的反射系數(shù)在-20dB以下,對(duì)其他低次模式抑制度大于30dB。第二種是八路花瓣形寬帶模式轉(zhuǎn)換器,這種電路帶寬寬,體積小且容易加工。在30.5-39.5GHz的頻率范圍內(nèi),八路花瓣型模式轉(zhuǎn)換器圓波導(dǎo)端口01TE模式的回波損耗小于-20dB,對(duì)其他低次模式的抑制都在40dB以上。同時(shí),本文分別利用四路花瓣形模式轉(zhuǎn)換器以及八路花瓣形模式轉(zhuǎn)換器在Ka頻段制作了基于圓波導(dǎo)01TE模式的15/30路功率合成網(wǎng)絡(luò)。2設(shè)計(jì)了兩種基于扇形波導(dǎo)徑向架構(gòu)的多路功率合成網(wǎng)絡(luò),分別是基于?/2扇形波導(dǎo)以及基于?/4扇形波導(dǎo)徑向16路功率合成器。這類電路既具有徑向架構(gòu)功率合成結(jié)構(gòu)緊湊,合成損耗低等優(yōu)勢(shì),同時(shí)又能避免傳統(tǒng)圓波導(dǎo)徑向多路合成器分支路端口幅度不一致的問題。電磁仿真結(jié)果表明,這兩種結(jié)構(gòu)在32-38GHz內(nèi)16路分支路端口的幅度不平衡性小于0.2dB。3設(shè)計(jì)了一種寬帶的基于波導(dǎo)Y分支使用E面有耗平面?zhèn)鬏斁�的兩路功率合成器,平行于E面的有耗傳輸線能解決傳統(tǒng)的波導(dǎo)Y型分支分支路端口間隔離度和分支路端口駐波特性差的問題。同時(shí)這種電路結(jié)構(gòu)加工、裝配簡(jiǎn)單方便。測(cè)試結(jié)果表明:在整個(gè)Ka頻段,分支路端口的回波損耗低于-12dB,分支路端口間的隔離度大于18dB。4設(shè)計(jì)了一種基于有耗網(wǎng)絡(luò)的圓波導(dǎo)徑向30路功率合成器,該合成器采用多路徑向構(gòu)架和阻性有耗網(wǎng)絡(luò),實(shí)現(xiàn)了低損耗多路功率合成,并解決了傳統(tǒng)圓波導(dǎo)徑向多路功率合成器端口駐波和端口隔離度性能差的問題,可用于滿足毫米波多路高效率高功率合成需求,此外該功率合成器電路還具有小型化,寬頻帶等優(yōu)點(diǎn)。電磁仿真結(jié)果表明在32-38GHz頻段內(nèi)該電路支路間隔離度全部大于17dB,分支路端口的反射系數(shù)優(yōu)于15dB。
[Abstract]:With the development of semiconductor technology, the performance of monolithic power amplifier is improving. However, the output power of a single power amplifier chip in the millimeter-wave band still can not meet the needs of the system, so high-power synthesis technology based on solid-state amplifier has been a hot spot in millimeter-wave field, and it is also the focus of this paper. The main results of this paper are as follows: 1 designed two new mode conversion structures of broadband rectangular waveguide to circular waveguide 01TE mode. The first one is a broadband mode converter with both marine and petal shape. This circuit has wide bandwidth and small size. Both marine type and petal mode converter advantages. In the frequency band of 30-40GHz, the reflection coefficient of 01TE mode on the circular waveguide port is below -20 dB, and the suppression degree for other low-order modes is more than 30 dB. The second is eight petal-shaped broadband mode converters, which have wide bandwidth, small size and easy processing. In the frequency range of 30.5-39.5GHz, the echo loss of the 01TE mode of eight petal mode converters is less than -20 dB, and the suppression of other low-order modes is above 40dB. meanwhile In this paper, four petal mode converters and eight petal mode converters are used to fabricate 15 / 30 power synthesizer networks based on circular waveguide 01TE mode in Ka band respectively. Two kinds of multiplex structures based on sector waveguide radial structure are designed. Path power synthesis network, They are based on a / 2 sector waveguide and a / 4 sector waveguide based on a radial 16 channel power synthesizer. This kind of circuit not only has the advantages of compact radial structure, low synthesis loss and so on, but also can avoid the problem of inconsistent amplitude of branch port of traditional circular waveguide radial multiplexer. The results of electromagnetic simulation show that the amplitude unbalance of these two structures in 32-38GHz is less than that in 0.2dB.3. A wideband two-channel power synthesizer based on waveguide Y branch using E-plane lossy plane transmission line is designed. A lossy transmission line parallel to the E plane can solve the problems of the isolation between the ports of the Y-type branch of the waveguide and the difference of the standing wave characteristics of the branch ports. At the same time, the circuit structure processing, simple and convenient assembly. The test results show that in the whole Ka band, the echo loss of the branch port is lower than -12 dB, and the isolation between the branch ports is greater than that of 18dB.4. A radial 30 channel power synthesizer with circular waveguide based on lossy network is designed. This synthesizer uses multi-channel radial frame and resistive lossy network to realize low loss multipath power synthesis, and solves the problem of poor performance of standing wave and port isolation of traditional circular waveguide radial multiplex power synthesizer. It can be used to meet the demand of millimeter-wave multichannel high efficiency and high power synthesizer. In addition, the power synthesizer has the advantages of miniaturization, wide band and so on. The electromagnetic simulation results show that the isolation between the branches in the 32-38GHz band is all greater than 17 dB, and the reflection coefficient of the branch port is better than 15 dB.
【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】：2017
【分類號(hào)】：TN73

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本文編號(hào)：2182496