【正文】 I 摘要 近年來(lái) ,由于無(wú)線通信技術(shù)的飛速發(fā)展 ,使電磁波頻譜變得越來(lái)越擁擠，而在無(wú)線通信系統(tǒng)中，尤其是在接收機(jī)前端，帶通濾波器性能的優(yōu)劣直接影響到整個(gè)接收機(jī)性能的好壞。因此，發(fā)展高性能，研究小型化的微波濾波器是當(dāng)前非常受關(guān)注的議題。 本次基于橢圓函數(shù)的微波帶通濾波器設(shè)計(jì)，首先，由要求的技術(shù)指標(biāo)確定濾波器階數(shù)；其次，通過(guò)已成熟的濾波器理論查表確定相應(yīng)低通原型濾波器各元件的參數(shù)，并根據(jù)頻率變換得到所需帶通濾波器的電路模型；然后，借助微波電路設(shè)計(jì)的首選工程軟件 ADS2021 對(duì)其原理圖進(jìn)行仿真，得到所設(shè)計(jì)的橢圓函數(shù)微波帶 通濾波器的 21S 和 11S 的數(shù)據(jù)顯示圖；最后通過(guò)分析數(shù)據(jù)圖并不斷優(yōu)化設(shè)計(jì)方案以達(dá)到所設(shè)計(jì)的技術(shù)指標(biāo)要求，并綜合比較得到最佳的原理圖及相應(yīng)的元件值。分析數(shù)據(jù)結(jié)果可得到所設(shè)計(jì)的濾波器達(dá)到了設(shè)計(jì)指標(biāo)要求，表明設(shè)計(jì)設(shè)計(jì)方案可行。 關(guān)鍵詞： 橢圓函數(shù)；微波濾波器； ADS Abstract II In recent years, due to the rapid development of wireless munication technology, the electromagic spectrum is being increasingly congested. In the wireless munication system, especially in the frontend of the receiver bandpass, the performance quality of bandpass filter directly affect the performance of the receiver. Therefore, research for highperformance and miniaturized microwave filter is very popular currently. This article designs a microwave bandpass filter based on elliptic functions. Firstly, the filter order number are determined by the requirements of the technical indicators。 Secondly, we lookup table to determine the parameters of the corresponding lowpass prototype filter through the mature theory of filter and according to the frequency conversion we get the circuit model of bandpass filter。 Then, we simulate for its schematic by means of a microwave circuit design preferred engineering software ADS2021 and data 21S and 11S the elliptic function of the microwave bandpass filter design are shown in Figure。 Finally, we analyze the data graph and optimize the design to meet the technical requirements of the design, and pare to get the best integrated schematic and the corresponding ponent values. The results obtained by analyzing data achieve the design requirements of designed filters and show that the design is feasible. Keywords: elliptic function。 microwave filters。 ADS I 目錄 第 1章 概論 ........................................................................................................................................1 微波濾波器的研究意義 .......................................................................................................1 微波濾波器的進(jìn)展 ................................................................................................................1 本文內(nèi)容的安排 ...................................................................................................................3 第 2章 現(xiàn)代微波濾波器的設(shè)計(jì)基礎(chǔ) ................................................................................................4 基本的概念與技術(shù)指標(biāo) .......................................................................................................4 微波網(wǎng)絡(luò)的基本理論 ...........................................................................................................6 微波網(wǎng)絡(luò)的參量 ...................................................................................................................6 轉(zhuǎn)移參量（ A參量） .................................................................................................6 阻抗參量（ Z參量）和導(dǎo)納參量（ Y 參量） ..........................................................7 散射參量（ S參量） .................................................................................................8 第 3章 橢圓函數(shù)濾波器綜合 ............................................................................................................9 橢圓函數(shù)濾波器的基本概念 ...............................................................................................9 橢圓函數(shù)的定義 ........................................................................................................9 橢圓函數(shù)濾波器的定義 ............................................................................................9 微波濾波器的設(shè)計(jì)方法概述 .............................................................................................10 歸一化低通原型濾波器的一般概念 .................................................................................10 一般低通原型濾波器的結(jié)構(gòu) .................................................................................. 11 橢圓函數(shù)低通原型濾波器的結(jié)構(gòu) .......................................................................... 11 頻率變換 .............................................................................................................................13 由低通到高通的頻率變換 ......................................................................................13 由低通到帶阻的頻率變換 ......................................................................................14 由低通到帶通的頻率變換 ......................................................................................14 耦合諧振器濾波器常用耦合矩陣 .....................................................................................15 環(huán)路方程 ..................................................................................................................15 節(jié)點(diǎn)方程 ..................................................................................................................18 第 4章 橢圓函數(shù)濾波器的設(shè)計(jì)及仿真 ..........................................................................................19 橢圓函數(shù)帶通濾波器的設(shè)計(jì)流程 .....................................................................................19 采用傳統(tǒng)方法設(shè)計(jì)橢圓函數(shù)帶通濾波器 .........................................................................20 橢圓函數(shù)濾波器低通原型的確定 ..........................................................................20 橢圓函數(shù)帶通濾波 器電路的設(shè)計(jì) ..........................................................................21 II 傳統(tǒng)算法與 ADS 相結(jié)合設(shè)計(jì) .............................................................................................24 橢圓函數(shù)帶通濾波器階數(shù)的確定 ..........................................................................24 橢圓函 數(shù)帶通濾波器電路圖的設(shè)計(jì) ......................................................................24 擴(kuò)大濾波器的階數(shù)設(shè)計(jì) .....................................................................................................26 五階橢圓帶通濾波器的設(shè)計(jì) ...........................................................................