标题: | 低温共烧陶瓷技术之非平衡至平衡及电容抽头分接式交连滤波器暨射频平衡输入至平衡输出带通滤波器研究 Research on Unbalanced to Balanced Band-pass Filter with Tapped Capacitor for Selectivity Improvement Using LTCC and Balanced Input-Output Band-pass Filter |
作者: | 吴能炎 Nen-Yen Wu 钟世忠 Shyh-Jong Chung 电机学院电信学程 |
关键字: | 电容抽头分接式交连;低温共烧陶瓷;Tapped Capacitor;Low Temperature Co-fired Ceramic (LTCC |
公开日期: | 2007 |
摘要: | 篇论文前段旨在已知的Marchan Balun结构中,利用输入传输线的开路尾端(open end)直接接地,并于输入端加上一对地电容使其产生共振腔而形成一带通滤波器。此特性更别于以往传统Marchan Balun,特别在输出的平衡端点上跨接一电容器,使其输出传输线经由地的连接串联形成一段连续电感,并产生另一共振腔而形成一带通滤波。因此这样的两个共振腔经由Marchan Balun的交连耦合特性就可以形成一个有带通滤波器特性的Balun。由于为了提升其选择性,使用电容抽头Tapped-Capacitor的方试进行耦合交连,用升阻的方式来提升并联共振Q值(circuit Q),并且提升通带的频率响应特性且利用低温共烧陶瓷多层架构的技术,来完成此一平衡式带通滤波器的设计。平衡式射频输入至平衡式射频输出带通滤波器由于中心频率设计于2.4GHz,所以此带通滤波器适用于蓝牙或无线区域网路(IEEE 802.11b/g)之应用中。 在本篇论文的后段,则是利用已经知悉方式在Marchan Balun输出的平衡端点上跨接一电容器和使其输出传输线经由地的连接串联,形成一段连续电感并产生一并联共振,此外在输入端以背靠背的方式建构另一平衡输入端,经由两个共振腔的交连耦合特性就可以形成一平衡式射频输入至平衡式射频输出带通滤波器,并利用R/T Duroid/5880 substrate及high-Q discrete陶瓷电容来完成实验印证。此一带通滤波器可用于提升射频信号能力,此一设计用于接续平衡射频输入如Dipole Antenna。由于2.4GHz的设计所以此带通滤波器亦适用于蓝牙或无线区域网路(IEEE 802.11b/g)之应用中。 This study proposes an unbalanced to balanced band-pass filter and a balanced input-output band-pass filter. Firstly, an unbalanced to balanced band-pass filter which is composed from a Marchand balun circuitry using Low Temperature Co-fired Ceramic (LTCC) technology is proposed and designed. Based on the Marchand balun, this work uses a shunt capacitor connecting the input port to ground, and then lets the open end of the input transmission line be short to ground, thus can derive a resonator. Besides, a capacitor is connected between the two balanced output ports of the Marchand balun, and remaining the other end of each output transmission line connected to ground. Therefore, it can form another resonator. For improving the performance of selectivity, tapped-C is used to enhance the circuit Q of the resonator and to couple the signal to the next stage. The proposed unbalance to balance band-pass filter which has low insertion loss at pass band and good attenuation at suppression area can be applied in Bluetooth or IEEE 802.11b/g WLAN (Wireless Local Area Network). Secondly, a balanced to balanced band-pass filter is proposed. Also based on the Marchand balun mentioned above, a capacitor is connected between the two balanced output ports, and thus forms a parallel-LC resonator by co-operating the grounded transmission line. After duplicating the same balanced ports with back-to-back structure, a balanced to balanced band-pass filter is derived. In order to verify the circuit simulation, we used low loss R/T Duroid/5880 substrate and high-Q discrete ceramic capacitors to implement the experiment circuit. The proposed balanced to balanced band-pass filter can also be applied in Bluetooth or IEEE 802.11b/g WLAN (Wireless Local Area Network). |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009267568 http://hdl.handle.net/11536/77747 |
显示于类别: | Thesis |
文件中的档案:
If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.