共查询到20条相似文献,搜索用时 31 毫秒
1.
A novel type of dual-mode microstrip bandpass filter using degenerate modes of a dual-mode microstrip square loop resonator with capacitively loaded open-loop arms is proposed. Such a dual-mode bandpass filter with a 0.75% bandwidth at the center frequency of 1.603 GHz is designed and fabricated to demonstrate the design of reduced-size microstrip filters. It is shown that the proposed filter has a size reduction of about 59% at the same center frequency, as compared with the dual-mode bandpass filters such as microstrip patch, cross-slotted patch, square loop and ring resonator filter. 相似文献
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A dual-mode microstrip bandpass filter using the degenerate modes of a modified square ring structure is proposed. The size of the new structure is 50% less than conventional dual-mode bandpass microstrip square resonator filters at the same centre frequency. Measurements are in good agreement with designed values. 相似文献
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Dual-mode triangular-patch bandpass filter using spur-lines 总被引:1,自引:0,他引:1
Without any perturbations on the surface of the patch resonator or orthogonal feed lines, a new microstrip dual-mode triangular-patch bandpass filter with low insertion loss and one transmission zero is presented. The degenerate modes are realised by use of the input/output spur-lines. It has been verified by simulation and measurement. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2009,19(9):548-550
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A novel dual-mode microstrip square loop resonator is proposed using the slow-wave and dispersion features of the microstrip slow-wave open-loop resonator. It is shown that the designed and fabricated dual-mode microstrip filter has a wide stopband including the first spurious resonance frequency. Also, it has a size reduction of about 50% at the same center frequency, as compared with the dual-mode bandpass filters such as microstrip patch, cross-slotted patch, square loop, and ring resonator filter. 相似文献
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A bandpass filter (BPF) design using a dual-mode microstrip triangular loop resonator is presented for the first time. The circuit produces frequency responses with one real finite frequency transmission zero and one imaginary finite frequency zero on either side of the passband. Depending on the perturbation arrangement, the nature of the coupling between degenerate modes causes the zeros to exchange their axis locations from real to imaginary and from imaginary to real while keeping their magnitude. This behavior results in frequency responses that are suitable for applications with asymmetrical requirements. Results show 8% bandwidth filters with insertion loss ranging from 0.82 dB to 1.4dB at 10 GHz. Advantages in size reduction and design flexibility are demonstrated when the triangular loop is compared to other dual-mode resonators. 相似文献
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Theory and experiment of dual-mode microstrip triangular patch resonators and filters 总被引:1,自引:0,他引:1
Jia-Sheng Hong Shuzhou Li 《Microwave Theory and Techniques》2004,52(4):1237-1243
In this paper, we report on the results of an investigation into dual-mode operation of microstrip triangular patch resonators and their applications for designing dual-mode bandpass filters. It has been found theoretically that the dual modes can result from the rotation and superposition of a fundamental mode. The characteristics of the dual modes and their mode splitting are described. The applications of this new type of dual-mode microstrip patch resonator in the design of microwave planar filter are presented. A circuit model for operation of this type of filter is proposed. Two- and four-pole filters of this type are demonstrated for the first time. Both theoretical and experimental results are presented. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2006,16(9):499-501
A reconfigurable bandpass filter with asymmetrical responses is demonstrated using a dual-mode microstrip resonator. The proposed topology introduces several fixed and switchable perturbations to control the center frequency and the location of the transmission zeros of the filter. The tuning mechanism consists of capacitively loading the edges of a modified square patch resonator, in order to manipulate the current distribution of the degenerate modes. This operation results in asymmetrical responses with a center frequency tuning ratio of 10% at$X$ band, and angular transmission zero displacement of$Deltaomega_z=$ 3.5rad/s or greater in both a lower and higher side of the passband. 相似文献
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本文提出了基于微带贴片谐振器的高选择性双模双通带带通滤波器及一种模式分析算法.首次利用该算法分析了微带贴片的模式组成,计算了导模场的闭式解.微带贴片的耦合馈线同时作为谐振单元构成第二个通带,减小了结构尺寸.全波仿真分析(full wave analysis)结果及测试数据表明,与现有的双模双通带带通滤波器相比,本文设计的滤波器传输零点个数增加了2倍,达到11个,带外抑制度达到20dB,带内插损较小,仅为1.2dB,抑制了寄生通带.同时设计的拓扑结构复杂度较低,利于滤波器的小型化. 相似文献
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Dual-Mode Microstrip Open-Loop Resonators and Filters 总被引:1,自引:0,他引:1
A miniature dual-mode microstrip open-loop resonator is proposed. Distinct characteristics of this new type of dual-mode resonator are investigated using full-wave electromagnetic simulations. It is shown that the two operating modes, i.e., the even and odd modes, within a single dual-mode resonator of this type do not couple. It is also found that there is a finite-frequency transmission zero inherently associated with the even mode. Two two-pole filters using this type of dual-mode resonator are demonstrated with opposite asymmetric responses, which result from different locations of the transmission zero. Higher order filters of this type are also investigated. Both simulated and measured results are presented. 相似文献
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It is shown that two degenerate modes can be excited on a microstrip ring resonator. These modes can be used to realise a double-tuned circuit bandpass filter in microstrip technique. 相似文献
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A novel realisation of quasielliptic function narrowband bandpass filters constructed from face-to-face dual-mode microstrip square loop resonators is proposed. The new filter configuration allows crosscoupling between the degenerate modes of individual dual-mode resonators. The realisation has been confirmed both theoretically and experimentally 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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Yi-Fang Lin Chien-Hung Chen Kuan-Yu Chen Hua-Ming Chen Kin-Lu Wong 《Microwave and Wireless Components Letters, IEEE》2007,17(8):580-582
A dual-mode bandpass filter using the degenerate modes of a modified square ring structure printed on the high-permittivity substrate is proposed. The dual-mode resonator is based on a square ring loaded with a cross-strip. The filter is printed on the Al2O3 substrate with a permittivity of 9.8 and could be easily integrated with radio frequency circuits. Besides its simple structure, the filter shows low insertion loss and small size, owing to the high-permittivity substrate used. The proposed filter shows a size reduction of 44% compared with the case using a simple cross-strip, and it also provides transmission zeros on both sides of the bandwidth. Experimental results are in good agreement with simulated values. 相似文献
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提出了一种多模方式工作的微带方形贴片带通滤波器。通常设计微带方形贴片滤波器主要是利用TM1,0,0和TM0,1,0这一对简并主模实现单模或双模的工作方式。但是这些滤波器尚存一些有待完善的地方,诸如带内插损偏大,带宽受限等等。本文设计的带通滤波器不使用主模,而是利用三个高次模分量,通过一种简单的微扰方式和馈电方式激励起除简并主模以外的三个高次模分量,并使之相互耦合实现通带。仿真和测量结果充分说明,这种滤波器能够实现宽频段的通带响应,并且在通带内具有很低的插损和良好的阻抗匹配特性,能够广泛地适用于微波平面电路。 相似文献
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A new type of reconfigurable asymmetric frequency response bandpass filter using dual-mode open-loop resonator is investigated. It explores the unique characteristic of the dual-mode open-loop resonator whose two operating modes, i.e., the even- and odd-modes do not couple. Thus, tuning the passband frequency is accomplished by merely changing the two modal frequencies proportionally, which makes the electronic tuning simple. Furthermore, for a single filter of this type, its selectivity can be electronically reconfigured to exhibit a higher selectivity with a finite-frequency transmission zero on either side of the passband. For the demonstration, both simulated and measured results are presented. 相似文献
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PBG-excited split-mode resonator bandpass filter 总被引:2,自引:0,他引:2
Photonic bandgap structure is used as a design parameter for the fundamental passband in a split-mode microstrip square resonator. A defect in the PBG cells under the resonator, allows coupling between the two degenerate modes. A filter is designed at 2.2 GHz with good agreement between simulated and measured results 相似文献