Ultra-Wideband (UWB) Bandpass Filters With Hybrid Microstrip/Slotline Structures
Ultra-Wideband (UWB) Bandpass Filters With Hybrid Microstrip/Slotline Structures
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DOI：
10.1109/lmwc.2007.908047
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发表时间：
2007-11
影响因子：
3
通讯作者：
Rui Li;Lei Zhu
中科院分区：
文献类型：
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作者：
Rui Li;Lei Zhu
提出了一种新型的超宽带（UWB）带通滤波器，该滤波器采用背靠背微带-槽线过渡结构和三模槽线谐振器。在中心频率处构造了一个长度为一个全波长的均匀槽线谐振腔。然后将两条微带馈线放置在槽线谐振器上方以构成背靠背微带-槽线过渡，其中两个交点相等地位于距离两个短路端四分之一波长处。通过适当拉伸微带线的长度，利用第一和第三谐振模的下截止边和上截止边构成超宽带通带，通过形成W形槽线谐振器，引入交叉耦合，级联两个低通滤波器，设计、制作和测试了两个改善带外性能的超宽带带通滤波器。测量结果实现了2.56-10.90 GHz或124%的通带，回波损耗>12.04 dB，群延迟变化<0.58 ns，尖锐的抑制裙和扩展的上阻带。
A novel ultra-wideband (UWB) bandpass filter is presented using back-to-back microstrip-slotline transition and triple-mode slotline resonator. A uniform slotline resonator is constructed with a length of one full wavelength at the central frequency. Two microstrip feed lines are then placed above the slotline resonator to make up a back-to-back microstrip-slotline transition, where two intersection points are equally located at one quarter-wavelength away from two short-ends. By properly stretching the microstrip line lengths, an ultra-wide passband is constituted with the lower/upper cut-off edges dominated by the first/third resonant modes.By forming a W-shaped slotline resonator, introducing a cross coupling and cascading two lowpass filters, two UWB bandpass filters with improved out-of-band performances are designed, fabricated and measured. Measured results achieve a 2.56-to-10.90 GHz or 124% passband with return loss >12.04 dB, group delay variation <0.58 ns, sharpened rejection skirts and extended upper-stopband.