高端锐截止的短截线超宽带滤波器

对传统短截线超宽带滤波器作了改进：首先,各短路短截线的长度不限定为1/4波长,且互相之间有差异,这就使得原本集中于2f0的N个传输零点在一定阻带范围内分散并优化分布;其次,在每个1/4波长连接传输线的中点位置加载一定长度和特性阻抗的开路短截线,从而在高频阻带范围内产生了若干新的传输零点。通过软件优化,高频阻带出现了等波纹抑制特性。该方案使得短截线滤波器的通带高端锐截止,且高频阻带的带宽变宽。实测结果证明了该方法的有效性。  

抗干扰技术分析

抗干扰技术是现代信息战争的支柱,必须研究有效的抗干扰技术以对付日益严重的干扰威胁。介绍了干扰和抗干扰的几种方式,给出了扩频、自适应天线、自适应干扰抑制、纠错编码+交织技术、自适应功率控制和自适应选频等多种抗干扰技术,论述了电调滤波技术抗干扰的工作原理,重点分析了电调滤波器的实现及在抗干扰通信中的优点,指出了固定宽带滤波器的不足,探讨了未来电子对抗的发展方向。  

新型微带抽头式发夹型带通滤波器的设计*

利用ADS(Advanced Design System)软件设计、研究了一种新型的微带抽头式发夹型带通滤波器。该 滤波器工作在S 波段,相比较于传统的微带抽头式发夹型带通滤波器,该滤波器在信号的输入输出端各加入了一段 四分之一波长的开路微带线,很好地抑制了邻近的寄生通带,使滤波器具有了良好的阻带特性。同时在该滤波器的 谐振单元间并联了一段长度为λ / 2 的微带线,在该滤波器通带两侧增加了一对传输零点,使滤波器的选择性得到 了极大的优化。最后还对所设计的新型滤波器进行了实物加工和测试,测试结果和仿真结果吻合较好。  

低频宽带低相位波动滤波器

本文介绍了体声波的产生和抑制；叙述了我们在研制工作频率为１０．７ＭＨｚ、４０％带宽的低频宽带滤波器过程；给出了补偿体波效应所采取的措施，以及试验结果。  

Compact Bandpass Filter with high selectivity and wide stopband using Slotted Stepped-Impedance Resonator

In this paper, a Slotted Stepped-Impedance Resonator (SSIR) is proposed. Due to the slots in the low-impedance section of the conventional SIR, the new resonator has a lower fundamental resonance f0 and can provide a potential finite transmission zero fz close to f0. Based on the proposed SSIR, a fourth-order Chebychev BandPass Filter (BPF) is designed at f0=1 GHz. The measured results show that a better than –65 dB rejection is achieved on both the lower and the upper stopband. Moreover, the new filter has a wide –30 dB rejection upper stopband from 1.13f0 to 6.52f0. The fab-ricated filter exhibits a size of The new filter has a planar topology and is easily integrated with modern portable communication systems.  

基于折叠枝节加载多模谐振器的超宽带滤波器

针对超宽带滤波器的插入损耗和选择性问题,提出一种基于折叠枝节加载多模谐振器结构的超宽带滤波器。通过调节谐振器的阻抗比及电长度比,可以控制谐振频率。仿真与实验结果吻合良好,表明采用折叠枝节加载形式,可以使滤波器具有低插入损耗和良好的选择性。通带范围在2.9~10.7 GHz,带内插入损耗优于1 d B,实现相对带宽114%。  

COMPACT BANDPASS FILTER WITH HIGH SELECTIVITY AND WIDE STOPBAND USING SLOTTED STEPPED-IMPEDANCE RESONATOR

In this paper,a Slotted Stepped-Impedance Resonator (SSIR) is proposed.Due to the slots in the low-impedance section of the conventional SIR,the new resonator has a lower fundamental resonance f0 and c...  

Analytical design of a microstrip UWB BPF with sharp rejection

This paper presents a new Ultra-WideBand (UWB) BandPass Filter (BPF) using half-wavelength (??/2) Stepped-Impedance Stub-Loaded Resonator (SISLR). Analytical equations derived by the even-odd mode analysis show the new filter has two tunable transmission zeros at both sides of the passband to provide a sharp rejection and seven transmission poles inside the passband to achieve U.S. UWB performance. For verification, a UWB BPF is designed, fabricated and measured. The measured results show that the fabricated filter has a -3 dB fractional bandwidth from 3.0 GHz to 10.9 GHz and its insertion loss less than 0.9 dB over the whole passband. Furthermore, the new filter exhibits a simple topology, sharp rejection, and deep stopband suppression.  

新型高选择性双模宽带带通滤波器设计

首先利用阶梯阻抗谐振器和交叉耦合馈线结构设计了一种带宽达73．2％新型双模带通滤波器。该谐振器在通带内产生两个可调模式，馈线结构在阻带对称产生两个传输零点。接着在馈线上加载短路线，使原有的两个传输零点向截止频率靠近，并在上阻带新增一个零点，从而在保持原滤波器通带性能的同时提高了频率选择性和上阻带特性。通过对比两个滤波器S参数进一步验证改进效果。最后制作测试了该短路线加栽的滤波器，仿真和实测结果吻合良好。  

基于CPW-微带过渡的超宽带滤波器

通过加载枝节,改进了基于CPW-微带过渡结构的超宽带带通滤波器。在微带线的中间采用了一个T型枝节以增强其选择性。该T型枝节能够在通带的上下边缘分别产生两个传输零点(2 GHz 与14 GHz)。此外,通过扇形开路枝节引入一个传输零点,将滤波器的上阻带延伸到了16 GHz。最后,加工并测试了一个滤波器用于验证。测试结果表明:该滤波器能够实现131% (2. 6 GHz ~12. 5 GHz)的相对带宽;同时,实测结果和仿真基本一致。