共查询到19条相似文献,搜索用时 93 毫秒
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提出了一种基于LTCC技术的高性能级联带通滤波器的实现方法。该滤波器电路在通过交叉耦合增加传输零点的同时又通过两个四谐振级半集总半分布式结构的滤波器级联而成,大大提高了滤波器的带外抑制度。借助电路仿真以及电磁场三维仿真软件进行优化仿真,实际测试结果与仿真结果吻合较好,中心频率为140MHz,带宽为20MHz,在0 MHz至115MHz频率以及200MHz至300MHz频率上的衰减均优于40d B,尺寸仅为9mm×3.2mm×1.5 mm。由于该滤波器频率较低,属VHF波段,波长较长,本设计中采用了半集总半分布结构来实现滤波器的小型化。 相似文献
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运用仿真软件Ansoft HFSS,构建了一款边带陡峭的LTCC带通滤波器的三维模型。在将滤波器级数增大到六级的基础上,又通过不相邻谐振级之间的交叉耦合,分别在阻带的高、低端引入了多个传输零点,大大提高了带外抑制度。结合电路仿真以及三维电磁场仿真,设计并制作了一款尺寸为4.5mm*3.4mm*1.5mm的六级带通滤波器,其中心频率为3.325GHz,带宽为170MHz,实测结果与仿真结果一致性较好。由于采用了目前流行的LTCC多层结构,该滤波器体积非常小,是标准的片式元器件封装,可以广泛应用于各移动通信系统中。 相似文献
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《功能材料与器件学报》2017,(5)
提出了一种基于LTCC的新型边带陡峭的带通滤波器的设计与实现方法。该带通滤波器电路采用六级结构紧凑的梳状线谐振单元,并创造性的将谐振单元连接起来,替代了原先的谐振单元间的宽边耦合,有效的增大了工作带宽,增强了边带抑制。本文设计的六级带通滤波器的性能指标如下:中心频率为4.65GHz,带宽为1.2GHz,通带内插入损耗小于2.5dB,回波损耗优于-15dB,带外1GHz处的衰减优于35dB。本滤波器通过LTCC技术进行加工生产,实物测试结果与软件仿真结果吻合较好。 相似文献
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为实现射频系统的小型化,本文设计出一种基于基片集成折叠波导( Substrate integrated folded waveguide,简称SIFW)的小型化宽带带通滤波器,并给出了仿真结果.为了改善带外抑制,滤波器通过交叉耦合,在通带低端引入两个传输零点.为改善通带高端滤波特性,在顶层和底层金属微带上刻蚀互补型开口谐振环(Complementary Split Ring Resonators,简称CSRR).仿真结果表明,所实现的滤波器中心频率在7.1 GHz,相对带宽约为47%,通带内回波损耗优于-15dB,插入损耗小于0.7dB. 相似文献
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随着商用无线通信的迅猛发展,微波电路越来越得到重视和发展。而微波带通滤波器作为微波器件的一种也得到了大力的发展,尤其是在接收机前端,带通滤波器性能的优劣直接影响到整个接收机性能的好坏,本文就滤波器的工作原理及一些相关理论做了简要概述,并提出微带线带通滤波器的设计细则。 相似文献
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单电子晶体管(SET)作为一种纳电子器件有着较大的优势,将SET与纳米MOS混合构成的器件(SETMOS)是目前研究的热点之一。SETMOS作为一种新的混合器件,在结合了两者优点的同时,具有与SET一样的库仑振荡特性和MOS高增益等特性。文章基于一种sETM0s混合结构的电压电流特性的数学模型,设计并实现了一种SETMOS二阶带通滤波器,阐述了这种SETMOS带通滤波器的结构、工作条件、性能、参数和特点,并用PSpice对其传输特性进行了仿真验证,结果证明,SETMOS在其通带范围内具有良好的带通幅频特性,且具有低电压、低功耗和高频的特点。 相似文献
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新型70MHz带通滤波器设计 总被引:2,自引:0,他引:2
本文以70MHz带通滤波器为例,论述了如何采用Bessel函数进行精确带通滤波器设计,同时利用Pspice对设计结果进行波特图和群延迟特性仿真。 相似文献
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In this paper, all-optical tunable filters based on two-dimensional photonic crystals with very small dimensions for optical telecommunication of WDM technology are designed and simulated. The structure is made of air holes in a dielectric background. The tuning is done by changing resonant defect angle. The channels obtained for this structure will be set in wavelength range of 1550 nm. Created channels are at wavelengths of 1550, 1551, 1552, and 1565 (16 channels); the distance between adjacent channels is 1 nm. Design and simulation of this filter is done by RSOFT software. Quality factor, transmission efficiency, and band gap shows that filter performance is very good. 相似文献
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长波红外宽光谱长波通滤光片是光谱成像技术中重要的光学元件。本文研究了一种宽光谱长波通滤光片优化设计,论述了设计长波红外宽光谱长波通滤光片的设计原则和方法。根据等效折射率理论,以周期性对称膜系为基础,使用压缩透射区内波纹幅度的部分膜层优化方法,设计了满足性能指标要求的长波红外长波通滤光片。经过优化,所设计的膜系高透射波段内的平均透射率大于90%,高透射区内的最低透射率也高于85%。截止波段内的平均透射率小于1%,截止区内的最高透射率也低于5%。研究表明,部分膜层优化方法设计的膜系,膜层结构简单,有利于膜层厚度的监控,既能克服全自动优化方法给工艺上带来的困难,又弥补了解析法设计膜系时不能调整光谱特性的不足。 相似文献
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基于小波滤波器组的涡街流量计信号处理方法 总被引:2,自引:0,他引:2
涡街流量计应用比较广泛,但是,由于易受管道振动和流场不稳定等因素干扰,如何从强噪声背景下检测出涡街信号频率,一直是个难题.研究了多相结构ⅡR小波滤波器组的设计方法,给出了Butterworth型小波滤波器组的实现方案,将基于小波滤波器组的信号处理方法应用于涡街流量计,并给出最佳频带的判别准则.仿真结果表明,Butterworth型小波滤波器组具有较好的幅频特性和较高的频率精度. 相似文献
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Ahmed Hammoodi Lukman Audah Laith Al-Jobouri Mazin Abed Mohammed Mustafa S. Aljumaily 《计算机、材料和连续体(英文)》2022,71(2):2721-2738
OFDM based waveforms are considered as the main part of the latest cellular communications standard (namely 5G). Many inherited problems
from the OFDM-Based LTE are still under investigation. Getting rid of the
out of band emissions is one of these problems. Ensuring low out of band
emission (OOBE) is deemed as one of the most critical challenges to support
development of future technologies such as 6G and beyond. Universal Filtered
Multi Carrier (UFMC) has been considered as one of the candidate waveforms for the 5G communications due to its robustness against Inter Carrier
Interference (ICI) and the Inter Symbol Interference (ISI). It is also a preferred
option because it is the most appropriate for low latency scenarios. In this
paper, a novel approach is proposed that makes use of modified Kaiser-Bessel
filter-based pulse windowing instead of standard Dolph-Chebyshev filter for
UFMC based waveform. The aim of proposing the new approach is to enable
the reduction of spectral leakage into nearby sub-bands. A comprehensive
study for the modified Kaiser-Bessel filters is performed and the results are
presented in terms of several Key Performance Indicators (KPIs). Based on
the results of the simulation, the UFMC Kaiser-Hankel window demonstrated
lower sidebands and better power spectral density, when compared with the
traditional Orthogonal frequency-division multiplexing (OFDM) and UFMC
as well as the normal UFMC Kaiser window. In addition, the real test for
the kaiser window with 5G waveform is lower OOBE than conventional 5G
waveform (CP-OFDM and UFMC). The OOBE reduction of 31% of the
Kaiser vs. the Dolph-Chebyshev filter, 68% of Kaiser Hankel over the DolphChebyshev, and 20% of Kaiser Hankel over Kaiser filter have been reported
in this paper. The Power Spectral Density has been improved accordingly. 相似文献
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The design, fabrication, and characterization of a one-dimensional photonic crystal optical filter that has a relatively narrow, flat-topped passband within a wide stop band and small angular sensitivity is presented. The filter is based on a one-dimensional photonic crystal structure that has multiple defects, facilitating simultaneous minimization of the angular sensitivity and optimization of the passband's characteristics. We use epitaxially grown and selectively oxidized GaAs/AlxOy multilayers to achieve a high-index-contrast material system and incorporate the experimentally determined optical and material properties into the design of the device. A flat-topped bandpass filter with a bandwidth of 65 nm and a wide field of view of 50 degrees is experimentally characterized and compared with the design predictions. 相似文献
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为了在空域无失真地接收宽带信号和有效地抑制环境干扰,提出了全设计频段束宽恒定的低旁瓣时域波束形成方法。首先,把宽带信号分为几个子带,应用半定规划的优化方法设计这些子带中心频率上的加权,使所形成的波束主瓣与设计带宽中最低频率上的波束相同,同时约束其具有低旁瓣特征。然后,设计FIR滤波器拟合这些离散频率点上恒定束宽加权所表示的幅相加权。显然,设计得到的FIR滤波器的幅相响应给出了全设计频段上的幅相加权。最后应用该方法,针对阵元具有方向性的12元均匀离散圆弧阵,设计覆盖一个倍频程的低旁瓣时域恒定束宽波束形成器,并使用线性调频信号作为测试信号,验证了所提方法的有效性。 相似文献