本文關鍵詞： 微帶濾波器 可調(diào)諧 雙頻段 變?nèi)荻䴓O管　出處：《華中科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：目前無線通信領域飛速發(fā)展,多種通信標準共存,這就要求通信設備朝著多頻化方向發(fā)展,特別地,頻率可調(diào)諧的多頻微波濾波器能根據(jù)實際需要調(diào)諧到所需的頻段,單個多頻可調(diào)濾波器就可以工作在更多的通信信道,減少了通信設備中的濾波器數(shù)量,減小了設備整體的體積和復雜性,因而受到了越來越多的關注。本文分別重點研究了2種微帶型諧振器結(jié)構(gòu)及其諧振特性,并通過在它們兩端加載變?nèi)荻䴓O管制作了兩款雙通帶獨立可調(diào)諧的微帶濾波器。主要內(nèi)容如下:一、介紹了電調(diào)諧濾波器的耦合結(jié)構(gòu)設計方法,通過探究濾波器的外部品質(zhì)因數(shù)和耦合系數(shù),確定結(jié)構(gòu)尺寸的初值。二、討論了一種新型的非對稱的λ/4諧振器對及其諧振特性,非對稱的λ/4諧振器對具有兩個相互獨立的諧振頻率,利用它設計制作一款雙通帶獨立可調(diào)的濾波器,最后的測試結(jié)果是第一通帶的中心頻率在0.88GHz-1.12GHz范圍調(diào)諧,3dB的相對帶寬在5.1%-6.4%范圍內(nèi)變化。第二通帶的中心頻率在1.5GHz-1.81GHz范圍調(diào)諧,3dB的相對帶寬在5.4%-6.4%范圍內(nèi)變化。三、研究了中間短路支節(jié)加載型諧振器結(jié)構(gòu)及其奇偶模諧振特性。研究發(fā)現(xiàn)當中間短路支節(jié)的長度很小時,奇偶模頻率近似相等,相互耦合形成單一諧振頻率。將兩個尺寸不同的中間短路支節(jié)加載諧振器用相同的輸入輸出饋線饋電,可以很方便的引入源與負載耦合,并在通帶兩端產(chǎn)生傳輸零點,在此基礎上設計一款帶外抑制良好的雙通帶獨立可調(diào)的濾波器,實物測試結(jié)果如下:第一通帶的中心頻率在0.81GHz-0.95GHz范圍調(diào)諧,3dB的相對帶寬在4.2%-5%范圍內(nèi)變化。第二通帶的中心頻率在1.51GHz-1.79GHz范圍調(diào)諧,3dB的相對帶寬在6.8%-8%范圍內(nèi)變化。在調(diào)諧過程中,通帶兩端的傳輸零點隨中心頻率同步變化。在上述設計基礎上,分別在輸入輸出饋線引入不同大小的DGS結(jié)構(gòu),成功抑制濾波器的高次模頻率,同時引入的DGS結(jié)構(gòu)對雙通帶性能的影響不大。
[Abstract]:At present, with the rapid development of wireless communication field and the coexistence of many communication standards, communication equipment is required to develop in the direction of multi-frequency. In particular, the frequency tunable multi-frequency microwave filter can be tuned to the required frequency band according to the actual needs. A single multi-frequency tunable filter can work in more communication channels, reducing the number of filters in the communication device and reducing the overall volume and complexity of the device. Therefore, more and more attention has been paid to it. In this paper, two kinds of microstrip resonator structures and their resonant characteristics are studied. Two microstrip filters with independent tunable double pass band are fabricated by loading varactor diodes at both ends. The main contents are as follows: first, the coupling structure design method of electrically tuned filter is introduced. By exploring the external quality factor and coupling coefficient of the filter, the initial value of the structure size is determined. Secondly, a new type of asymmetric 位 / 4 resonator pair and its resonance characteristics are discussed. The asymmetrical 位 / 4 resonator pair has two independent resonant frequencies, which are used to design and fabricate a double-pass band independently adjustable filter. The results show that the center frequency of the first pass band varies in the range of 0.88 GHz to 1.12 GHz, and the relative bandwidth of the tunable band varies from 5.1% to 6.4%. The center frequency of the second pass band varies in the range of 1.5 GHz to 1.81 GHz, and the relative bandwidth of the tunable band varies in the range of 5.4-6.4%. The structure and odd-even mode resonance characteristics of the intermediate short-circuit branch loaded resonator are studied. It is found that when the length of the intermediate short-circuit branch is very small, the odd-even mode frequency is approximately equal. Mutual coupling forms a single resonant frequency. The loading resonator with two intermediate short circuit branches of different sizes can be fed with the same input and output feeders, which can be easily introduced into the source and coupled with the load, and can transmit 00:00 at both ends of the passband. On this basis, a double-pass band independent tunable filter with good out-of-band suppression is designed. The results are as follows: the center frequency of the first pass band varies in the range of 0.81GHz to 0.95GHz and the relative bandwidth of 3dB varies in the range of 4.2% -5%. The center frequency of the second pass band varies in the range of 1.51GHz to 1.79GHz, and the relative bandwidth of 3dB varies in the range of 6.8-8%. The 00:00 transmission at both ends of the passband changes synchronously with the central frequency. On the basis of the above design, different sizes of DGS structures are introduced into the input and output feeders respectively, and the high order mode frequency of the filter is successfully suppressed. At the same time, the DGS structure introduced has little effect on the performance of double pass band.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713

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