【摘要】：隨著社會科技的進(jìn)步,無線通信技術(shù)越來越廣泛的應(yīng)用在社會的各個(gè)領(lǐng)域。無線信道內(nèi)信號的傳輸越來越擁擠,相互之間的電磁干擾也越來越強(qiáng)烈。尤其是在幾十MHz到幾百M(fèi)Hz的頻段,信道絕對帶寬相對與微波來說很窄,但大量的無線通信設(shè)備工作在這個(gè)頻段,這進(jìn)一步加劇了各信號之間的相互干擾。在跳頻通信中采用自適應(yīng)干擾和噪聲抵消技術(shù)是解決此電磁兼容問題的一種有效方法,這在國內(nèi)外多種干擾抵消裝置中得到了充分的證明。首先本文介紹了自適應(yīng)干擾抵消系統(tǒng)的研究背景和意義,國內(nèi)外自適應(yīng)干擾抵消系統(tǒng)研究進(jìn)展以及自適應(yīng)干擾抵消系統(tǒng)的整體概述,并對自適應(yīng)濾波器進(jìn)行相關(guān)介紹,自適應(yīng)干擾抵消系統(tǒng)是自適應(yīng)濾波器的一種具體應(yīng)用。對帶狀線定向耦合器在各頻段下的應(yīng)用可行性進(jìn)行分析,主要從三個(gè)方面入手：首先對器件小型化進(jìn)行研究,通過折疊帶狀線并且采用不平衡式的交叉級聯(lián)的方式減小器件體積,通過提高介電常數(shù)減小帶線的電長度,改變介質(zhì)板與兩側(cè)基板的厚度來控制器件的耦合度,通過仿真驗(yàn)證器件實(shí)施可行性；其次,對器件相位平衡度進(jìn)行深入研究,提出一種解決交叉級聯(lián)帶狀線定向耦合器相位平衡度的方法,經(jīng)驗(yàn)證圓滿的解決了高頻段相位偏移問題；最后,提出一種減小四分之一波長帶狀線耦合器輸入駐波比的方法,通過對各級四分之一波長連接線處采用漸變線的方式減小信號反射,提高器件功率容量,并對以后可能的改進(jìn)方案進(jìn)行分析,即完全采用漸變線的形式設(shè)計(jì)超寬帶帶狀線耦合器。本文通過仿真0.7CHz～2.7GHz超寬帶帶狀線耦合器來驗(yàn)證上述三個(gè)觀點(diǎn)。對電調(diào)衰減器各模塊電路進(jìn)行分析,設(shè)計(jì)并實(shí)現(xiàn)一種超寬帶大功率電調(diào)衰減器電路,并對衰減器實(shí)物的衰減幅頻特性與相頻特性進(jìn)行測試。
[Abstract]:With the progress of social science and technology, wireless communication technology is more and more widely used in various fields of society. The transmission of signals in wireless channels is becoming more and more crowded, and the electromagnetic interference between each other is becoming more and more intense. Especially in the frequency band of dozens of MHz to several hundred MHz, the absolute bandwidth of the channel is relatively narrow to that of microwave, but a large number of wireless communication devices work in this band, which further intensifies the mutual interference between the signals. Adaptive interference and noise cancellation technology is an effective method to solve this EMC problem in frequency hopping communication, which has been fully proved in many kinds of interference cancellation devices at home and abroad. Firstly, this paper introduces the research background and significance of adaptive interference cancellation system, the research progress of adaptive interference cancellation system at home and abroad, and the overall overview of adaptive interference cancellation system, and introduces the adaptive filter. Adaptive interference cancellation system is a specific application of adaptive filter. The feasibility of the application of the strip line directional coupler in each frequency band is analyzed, which is mainly from three aspects: firstly, the miniaturization of the device is studied. The coupling degree of the device is controlled by folding strip lines and adopting unbalanced cross cascade to reduce the volume of the device, and by increasing the dielectric constant to reduce the electric length of the band line and changing the thickness between the dielectric plate and the two sides of the substrate, the coupling degree of the device is controlled by changing the thickness of the dielectric plate and the two sides of the substrate. The feasibility of device implementation is verified by simulation. Secondly, the phase balance of the device is studied in depth, and a method to solve the phase balance of cross-cascade banded line directional coupler is proposed, which is proved to be a satisfactory solution to the problem of phase offset in high frequency band. Finally, a method of reducing the input standing wave ratio of 1/4 wavelength band line coupler is proposed. The signal reflection is reduced by using the gradual change line at the 1/4 wavelength connecting line at all levels, and the power capacity of the device is improved. The possible improvement scheme is analyzed, that is, the UWB strip coupler is designed in the form of gradient line. This paper verifies the above three viewpoints by simulating 0.7CHz~2.7GHz UWB strip coupler. This paper analyzes the various modules of the electrically modulated attenuator, designs and implements an ultra-wideband and high-power electric attenuator circuit, and tests the attenuation amplitude-frequency and phase-frequency characteristics of the attenuator.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN972

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