共查询到19条相似文献,搜索用时 140 毫秒
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本文介绍了一种基于缺陷地结构(DGS)的微带岔线型宽带带通滤波器的设计过程。此滤波器以四分之一波长的开路枝节型带通滤波器为原型进行设计和改进,引入了微带岔线和DGS 结构,在增加通带带宽和阻带带宽的同时,使滤波器的带外谐波抑制和带内回波损耗得到了很大的改善。采用HFSS 三维场仿真软件进行S 参数的仿真,从仿真结果可
以看出,所设计的带通滤波器中心频率为11.5GHz,其3dB 相对带宽大于50%,带内插损小于0.3dB。此外,在1-6GHz的第一阻带内,滤波器的带外抑制大于20dB,最大抑制度为52dB;在15-24GHz 的第二阻带内滤波器的带外抑制大于20dB,最大抑制度为46dB。整个滤波器尺寸仅为12mm × 16mm。 相似文献
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提出了一种基于周期缺陷地结构的可集成毫米波加脊半模波导滤波器。该滤波器利用了波导的高通特性以及周期缺陷接地结构的宽带抑制特性,从而构建了有效的通带滤波器。测试表明,该滤波器的3 dB通带范围为39.4~45.4 GHz,中心频点为42.4 GHz,3 dB相对带宽为14.1%,带内最低插入损耗为2.4 dB,位于44.2 GHz,高频带外抑制在58 GHz达40 dB。该滤波器的横截面相比矩形波导滤波器减小了约64 %,有利于电路小型化、集成化。随着5G通信向毫米波频段发展,这种小型化毫米波滤波器在5G通信中有着广阔的应用前景。 相似文献
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提出了一种频率在3.1~6.5GHz范围内的新型小型宽带带通滤波器。该滤波器结合圆形贴片谐振器的多模特性,通过引入输入端和输出端之间的耦合,增加了传输零点。通过三维仿真软件Ansoft HFSS中建模并优化,实现了通带内抑制在-20dB以下,低频段在1.9GHz处产生一个传输零点,高频段在7.6GHz处产生一个传输零点,带外抑制在-20dB以下。实测滤波器的结果与仿真结果基本一致,验证了设计的有效性。 相似文献
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目前研究宽频带微带滤波器的文献很多,但普遍不能同时具有宽频带和宽阻带的性能,且带内回波损耗大,带外抑制差。为此,提出了一种新型的宽频带微带滤波器。该滤波器采用在E型阶跃阻抗谐振器( SIR)中引入U型结构的方法,实现其宽频带宽阻带的性能。对滤波器进行仿真、加工与实测,仿真结果与实测结果吻合良好。加工得到的滤波器3 dB带宽为7.1 GHz,低于-20 dB的高频阻带为9.3 GHz,带内回波损耗低于-23.2 dB,实物尺寸为15 mm伊8.5 mm,具有小型化的特点。实测数据表明,提出的滤波器具有良好的性能,在工程领域具有实际的应用价值。 相似文献
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微波频段的宽带滤波器一般具有通带插入损耗大,带外抑制性差等问题,为了解决这个问题,采用具有慢波效应的缺陷地结构(DGS)和缺陷微带结构(DMS),设计了一种新型微波频段的超宽带滤波器。分别利用电磁仿真软件HFSS和平面印制板技术对其进行建模仿真和实物加工。实测与仿真结果良好吻合,带内插入损耗优于1.64dB,回波损耗优于13.93dB,通带范围在2.75~8.3GHz,实现相对带宽100.45%,高低阻带均抑制在-10dB以下,且该滤波器结构紧凑,体积小。 相似文献
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针对当前通信系统需要滤波器支持多频段、小型化和高性能等要求,提出了一种基于T型枝节加载SIR的频率独立可控双频微带滤波器结构。针对该谐振器,利用提出的特殊电耦合结构实现滤波器的小型化,并引入零度馈电结构构造传输零点来改善阻带抑制,最终得到覆盖WLAN 2.4 GHz和WLAN 5.2 GHz两个频段且占用尺寸仅为16.5 mm×21.7 mm的双频微带带通滤波器。由仿真结果显示,两个通带的中心频率分别为2.45 GHz和5.2 GHz,带内最小插入损耗分别为0.35 dB和0.47 dB,带内最小回波损耗分别为-44 dB和-34.8 dB,3 dB相对带宽分别为28.9%和11.3%,阻带抑制也因引入三个传输零点而大大改善。该滤波器结构整体尺寸小、插损低、频带宽且带外抑制特性好,具有一定的实际应用价值。 相似文献
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本文设计了一款哑铃槽加载的宽阻带四阶介质基片集成波导(SIW)滤波器。该滤波器通过直角耦合结构来引入传输零点,从而提高带外抑制。同时在SIW上面金属层刻蚀哑铃槽缺陷地结构,抑制高次模耦合传输,优化滤波器阻带性能。利用HFSS软件优化谐振腔尺寸、耦合窗大小和哑铃槽位置、尺寸以获得良好的性能。该滤波器的中心频率为20GHz,仿真结果显示通带内回波损耗优于20dB,21GHz-33GHz频段内带外抑制优于40dB,33GHz-45GHz频段内带外抑制优于21dB,实现了较宽的阻带。加工并测试了该滤波器,实测结果与仿真结果具有一定的吻合度。 相似文献
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Han-Jan Chen Tsung-Hui Huang Chin-Sheng Chang Lih-Shan Chen Na-Fu Wang Yeong-Her Wang Mau-Phon Houng 《Microwave and Wireless Components Letters, IEEE》2006,16(5):252-254
This letter presents a novel low-pass filter with an ultra-wide stopband. The proposed filter is comprised of a new cross-shape defected ground structure (CSDGS). By using this structure, the filter not only supports conventional DGS performances with a sharp rejection, but also exhibits an ultra-wide stopband. For the deigned low-pass filter, an insertion loss of less than 2dB from dc to 3.5GHz and the rejection is better than 20dB from 4.3 to 15.8GHz. Predicted performances show widened and deepened stopband beyond the low passband. Furthermore, it is confirmed by measurement. 相似文献
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A novel miniaturised dual-mode bandpass filter with multi-arc resonators is proposed. The size of the dual-mode filter can be reduced significantly by using the microstrip dual-mode resonator consisting of multi-arcs; meanwhile insertion loss and spurious response suppression are improved A prototype filter is designed and implemented at 3.6 GHz with 2.8% fractional bandwidth, which shows a low passband insertion loss of 1.02 dB and a wide stopband with rejection better than 20 dB up to about 8.5 GHz. 相似文献
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A new spiral loaded tapered compact microstrip resonator cell (SPLT-CMRC) is presented. The addition of spiral stubs to the CMRC creates transmission zeroes in the stopband which extended the stopband of the ?lter. The proposed resonator is used to design a compact lowpass ?lter (LPF) with wide and high rejection in stopband. The fabricated ?lter has a 3 dB cutoff frequency at 8 GHz. The insertion loss in the passband is less than 0.2 dB from DC to 7.2 GHz. The proposed ?lter has wide stopband from 9.47 to 40 GHz with attenuation level of ?20 dB. The demonstrated filter is designed and fabricated. There is a good agreement between the measured and simulated S-parameters. 相似文献
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基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联开路短截线,使得阻带增加额外传输陷波点来抑制寄生通带。利用ADS和HFSS仿真软件对滤波器结构进行优化设计,并进行了实物的加工和测试。实测结果表明,通带3 dB 截止频率为2 GHz,通带内0-1.8 GHz 回波损耗大于20 dB,3-20 GHz 频率范围内的阻带抑制能达到25 dB 以上。 相似文献
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提出了一种新型的方形贴片双模微带带通滤波器。该滤波器结构有一个切角,并且在贴片中心处开了一个两臂等长的十字槽,采用正交直接馈电方式,并在每条馈线上引入了一节与谐振腔有一定耦合的开路短截线。该结构在上下阻带都产生衰减极点,馈线上引入的微带线有效地抑制了寄生通带,提高了阻带抑制特性。仿真结果表明,该滤波器在中心频率2.9 GHz处,回波损耗优于–30.9 dB,通带内最小插入损耗为–0.1 dB,与实测结果基本一致。 相似文献
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Mohsen Hayati Hamed Abbasi Omid Sadeghi Fathabadi 《International Journal of Electronics》2013,100(9):1475-1485
This paper presents a novel microstrip lowpass filter with sharp roll-off and ultra-wide stopband using stepped-impedance resonator and bended transmission line structure. The filter includes stepped-impedance prototype filter and stepped-impedance compact microstrip resonator cells that are combined in one structure. The proposed filter has good specifications such as sharp roll-off, ultra-wide stopband and low insertion loss. The transition band is approximately 0.25 GHz from 1.75 to 2 GHz with corresponding attenuation levels of ?3 and ?40 dB. The attenuation level in the stopband is better than ?20 dB that is achieved from 1.94 to 23 GHz, and the insertion loss in the passband is less than 0.4 dB. The proposed filter is fabricated and measured, and the simulation and measurement results are found to be in good agreement with each other. 相似文献
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This letter proposes a wideband bandpass filter by cascading two 3-dB stepped-impedance cascadable 180deg hybrid rings with a pair of stepped-impedance lines. Thanks to the stepped-impedance lines, a broad upper stopband is achieved. The stepped-impedance vertically installed planar (VIP) coupler is used to implement the ideal 180deg phase inverter and crossovers. The experimental results show that this 2-GHz center frequency, fourth order filter has a 10-dB return loss bandwidth of 92.5% and upper stopband rejection levels of better than -20 dB up to 6.8 GHz. This proposed filter achieves wide passband and broad stopband performance simultaneously. 相似文献
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Mohsen Hayati Farzin Shama Hamed Abbasi 《International Journal of Electronics》2013,100(12):1751-1759
In this article, a novel microstrip lowpass filter (LPF) with specifications such as sharp cut-off, wide stopband, low insertion loss and high return loss using tapered resonator is presented. The LPF has cut-off frequency of 1.11 GHz, where unwanted harmonics are suppressed by novel tapered cells. The bandwidth is enhanced, and the size is reduced as compared to the conventional tapered filter. The transition band is approximately 0.29 GHz from 1.11 to 1.4 GHz with corresponding attenuation levels of –3 and –20 dB, respectively. The stopband with greater than –20 dB rejection is from 1.4 to 8.9 GHz, insertion loss in the passband is less than 0.1 dB, return loss is less than –18 dB and the overall size of the filter is 0.12 × 0.073 λg. The proposed filter is fabricated and measured. The simulation and measurement results are in good agreement. This LPF is designed for microwave communication applications, especially wireless video transmitters. 相似文献
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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. 相似文献