共查询到20条相似文献,搜索用时 15 毫秒
1.
Cheng-Yuan Hung Min-Hang Weng Ru-Yuan Yang Yan-Kuin Su 《Microwave and Wireless Components Letters, IEEE》2007,17(7):510-512
In this letter, a compact and high performance parallel coupled line wideband bandpass filter (PCL-WBF) with open stubs is designed and implemented on the commercial substrate, RT/Duroid 5880. The PCL-WBF is composed of a one-stage coupled line and two open stubs connected near the input/output ports. The design procedure and limit are discussed in detail. The designed filter was fabricated and measured, showing good characteristics of wide stopband and very high passband selectivity. Measured results also have a good agreement with the simulated results. 相似文献
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In this letter, a T-shaped microstrip feeding arrangement is proposed to design wideband bandpass filter (BPF) using shorted slot-line resonators. This feed line produces frequency selective external coupling which is utilized to suppress unwanted harmonics. Up to sixth order harmonics are suppressed. Other advantages are low passband group delay variation, ease of fabrication, low insertion loss (IL), and compact size. A fabricated BPF of fractional bandwidth 56.3% at midband frequency 2.3 GHz has a maximum IL of 1.2 dB in its passband and 30-dB upper stopband extends over 11.53 GHz 相似文献
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Yo-Shen Lin Po-Ying Chang Yu-Shu Hsieh 《Microwave and Wireless Components Letters, IEEE》2008,18(4):254-256
In this letter, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter- wavelength resonators and p-i-n diode switch is proposed. The proposed filter occupies only half the circuit size of the conventional parallel-coupled filter. In addition, the type and length of each coupled-line section is suitably chosen such that the inherent transmission zeros associated with the coupled-lines can be used to reject the spurious passbands effectively. By adding only one p-i-n diode along with a simple bias control circuitry, the proposed filter becomes electronically switchable with no current consumption when the filter is turned off. Specifically, a switchable fourth-order microstrip BPF with a center frequency f0 of 2 GHz, passband insertion loss less than 3 dB, and wide stopband up to 7.7 f0 in the ON state is demonstrated. The isolation of the filter is better than 30 dB from dc up to 7.7 f0 in the OFF state. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2009,19(5):290-292
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Mondal P. Mandal M.K. Chakrabarty A. 《Microwave and Wireless Components Letters, IEEE》2007,17(9):643-645
In this letter, a design of a compact bandpass filter with wide upper stopband is presented for the ultra-wideband communication systems. The filter structure is composed of a modified square slot-line resonator with parallel microstrip feed lines. Improved upper stopband is obtained by exploiting the frequency dispersive coupling behavior between the feed lines and the resonator. Measurements show that the 20.9 dB upper stopband extends at least up to 20 GHz. Filter occupying area is 0.26lambdag times 0.28g, lambdag being the microstrip line guided wavelength at 6.85 GHz. 相似文献
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In this letter, a novel microstrip bandpass filter (BPF) with asymmetric resonators is presented. With the asymmetric structure and capacitively loaded coupling, a wide bandwidth with sufficient rejection level can be achieved easily. A full-wave electromagnetic simulator IE3D is used, and the prototype of the BPF is fabricated and measured. Comparisons of simulated results and experimental data are shown; moreover, good match validates the proposed filter. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2008,18(12):767-769
8.
为改进原管状带通阻带特性,设计了一种新型结构.基于阻抗匹配,可在端头引入任意多“r型”网络.同时其衰减极点能有效抑制“谐振峰”状寄生,阻带拓宽多达1倍频程(现为1.27fo~17fo).改进后,滤波器具有低插损(小于等于0.77 dB)、轻量化(小于等于64 g)、高寄生抑制(大于等于75 dB)等特点.目前,该滤波器... 相似文献
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《Microwave Theory and Techniques》2009,57(11):2753-2760
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文中提出了一种具有宽阻带的紧凑型双频带通滤波器,它采用了折叠短路枝节负载谐振器、紧凑型微
带单元谐振器(CMRC)和阶跃阻抗谐振器结构。由于多个谐振器产生了五个可控传输零点(TZ),该滤波器实现了两个
通带之间的良好隔离度以及宽阻带特性。制作并测试了尺寸紧凑的双频带通滤波器实验样品,测试结果显示,第一通
带和第二通带的中心频率/ 插入损耗分别为0. 66 GHz/0. 8 dB 和1. 73 GHz/0. 7 dB,阻带频率高达10. 5 GHz,抑制水平
超过15 dB。 相似文献
11.
为实现滤波器设计小型化,降低带通滤波器的高次谐波干扰,本文结合传统的1/4波长谐振器结构,采用在谐振器微带线上添加开路线的方法,降低高次谐振频点处的插入损耗,消减谐波影响。相比半波谐振器,1/4波长谐振器能有效地减小滤波器尺寸,此外开路线的添加除具有消减高次谐波作用,同时还能降低基频谐振点,促进设计小型化。通过仿真软件对该方案的验证及网络分析仪的实物测试表明,此方案具有良好效果,能广泛应用于窄带通滤波器小型化及谐波抑制。 相似文献
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Ching-Wen Tang Yen-Kuo Hsu 《Microwave Theory and Techniques》2008,56(6):1468-1472
This paper develops a novel microstrip bandpass filter with ultra-wide stopband. With the assistance of open stubs and interdigital capacitors, a very wide stopband with a sufficient rejection level can be achieved easily. Detailed design and synthesis procedures are provided. Moreover, the electromagnetic simulator IE3D is used, and the prototype of the bandpass filter is fabricated and measured. Good agreement between measured and theoretically predicted results demonstrates feasibility of the proposed filter. 相似文献
15.
Shau-Gang Mao Yu-Zhi Chueh 《Microwave and Wireless Components Letters, IEEE》2007,17(3):181-183
This work presents a novel coplanar waveguide (CPW) bandpass filter (BPF) that uses electromagnetic bandgap (EBG) resonators to reduce the size and suppress the harmonic responses. The propagation characteristic of the EBG structure is investigated by its associated equivalent circuit model. Compared with the conventional half-wavelength resonator at 5GHz, the EBG resonator is 60.5 % more compact. Based on the EBG CPW resonators, the inductively-coupled two-pole BPF with 3.8% 3-dB bandwidth and 2-dB insertion loss at 5GHz is implemented. This structure generates a 59.6% reduction in size and suppresses a second harmonic passband when compared with a conventional filter. To eliminate the third harmonic response, the proposed EBG CPW BPF further incorporates two EBG structures into its input and output ports and has the merit of a small circuit area 相似文献
16.
《Microwave and Wireless Components Letters, IEEE》2009,19(7):452-454
17.
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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提出了一种基于LTCC技术的新型高阻带抑制带通滤波器的实现方法.采用在并联谐振器的圆柱形电感之间引入感性耦合,在高阻带产生一个传输零点,并且能实现非常好的阻带衰减性能.本文对传统的梳状线带通滤波器结构进行改进,利用过孔的寄生电感效应,将过孔用作谐振杆,明显减小了器件的尺寸.并且通过利用空间耦合的寄生效应,实现滤波器的阻带高抑制传输零点,以满足了对特殊频点高抑制的要求.运用该方法设计了中心频率1.65 GHz,通带200MHz,带外2GHz处衰减大于60dBc的五级带通滤波器.实物测试结果和全波电磁仿真结果吻合较好. 相似文献
19.
一种基于互异结构的宽阻带带通滤波器研究 总被引:1,自引:1,他引:0
针对带通滤波器的高次谐波干扰,结合目前常用的在输入输出微带馈线上添加开路线构成带阻的方法,采用两个互异的中间添加开路线的阶跃阻抗开环谐振器来实现高次谐振频点的相互分离,达到抑制高次谐波实现宽阻带的目的。通过仿真软件对这一方案的验证及网络分析仪的实物测试证明,该方案具有良好的效果,能广泛应用于带通滤波器的谐波抑制。 相似文献
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