共查询到20条相似文献,搜索用时 31 毫秒
1.
Peng Cai Zhewang Ma Hitoshi Kanzaki Yong Zhang Bin Chen 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(5):432-438
This paper presents a novel millimeter-wave ultra-wideband (UWB) bandpass filter (BPF) based on microstrip dual-mode rectangular
ring resonators. In order to get strong coupling between the input/output line and the dual-mode ring resonators, a step-impedance
parallel-coupled structure is adopted for the design of the filter. On the other hand, transmission zeros are produced by
the dual-mode resonator. As a consequence, the filter has low insertion-loss in its passband, sharp attenuation in its lower
and upper stopbands and very wide stopbands. As an example, a filter with two dual-mode ring resonators is designed and fabricated.
The measured frequency property of the fabricated filter shows good agreement with the simulated response. 相似文献
2.
Lung-Hwa Hsieh Kai Chang 《Electronics letters》2000,36(19):1626-1627
A novel microwave dual-mode elliptic-function bandpass filter with one coupling gap structure is proposed. This filter has a 4.7% bandwidth at 1.805 GHz with 1.73 dB insertion loss. The filter provides less field perturbation of the ring resonator than conventional filters. Without the output coupling gap between the feed line and the ring resonator, a low insertion loss has been obtained. This compact, high performance filter is useful for mobile and personal communication systems 相似文献
3.
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
4.
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
5.
针对微带滤波器高性能小型化的需求,提出了一种方环形微扰单元的双模贴片带通滤波器的设计.该滤波器由方形贴片作为谐振器,输入、输出端口采用直接馈电,具有对称结构.利用在方形贴片上蚀刻出方环形缺口的方式,对方形贴片谐振器进行微扰,实现双模滤波器.通过电磁仿真软件Ansoft HFSS分析了微扰单元的特性,对双模滤波器的性能进... 相似文献
6.
It is well known that two orthogonal resonant modes exist within a one-wavelength ring resonator. In this paper, we focus on a ring resonator possessing an impedance step as a form of perturbation. A convenient analyzing method for obtaining the resonance characteristics of this resonator structure is presented. Furthermore, generation of attenuation poles obtained by the dual-mode ring resonator is discussed. In addition, a filter design method based on this resonator is explained, followed by experimental results, which prove the validity of the proposed design method 相似文献
7.
《Microwave and Wireless Components Letters, IEEE》2009,19(8):497-499
8.
Lung-Hwa Hsieh Kai Chang 《Microwave Theory and Techniques》2002,50(5):1340-1345
A novel microwave dual-mode quasi-elliptic-function bandpass filter structure has been designed and fabricated. The filter uses L-shaped coupling arms for enhanced coupling and dual-mode excitation. The effects of varying the length of tuning stubs and gap size between tuning stubs and ring resonator have been studied. Filters using multiple cascaded ring resonators with high rejection band are presented. The new filters have been verified by simulation and measurement with good agreement 相似文献
9.
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
10.
This article presents a dual-mode resonator developed from a hairpin resonator with a reactive perturbation tapped at the mid-point. The dual-mode resonance characteristics are investigated intensive under both inductive and capacitive perturbations. Using this resonator, a method of synthesising the filter is also developed to determine the circuit layout directly according to the specified filter characteristics. Moreover, to improve the filter's performance, cross-coupling technique to realise quasi-elliptic responses is also discussed for both types of perturbations. Finally, two quasi-elliptic dual-mode filters were designed, fabricated and measured to verify the proposed theory. 相似文献
11.
Yi-Chyun Chiou Jen-Tsai Kuo Juo-Shiuan Wu 《Microwave and Wireless Components Letters, IEEE》2008,18(2):97-99
A microstrip-to-coplanar waveguide broadside-coupled section is used to replace a 34-section of the conventional dual-mode 1-ring resonator filter for circuit area miniaturization. It is believed that it is a new idea to incorporate the broadside-coupled section into a ring resonator filter for size reduction. For design purpose, some important characteristics of the broadside-coupled lines are investigated. In experiments, two realized circuits show only 19.4% of the area of a uniform ring. Measured responses show good agreement with simulation. 相似文献
12.
13.
Yng-Huey Jeng Chang S.-F.R. Yi-Ming Chen Yu-Jen Huang 《Microwave Theory and Techniques》2006,54(5):2146-2152
A novel dual-mode ring resonator with self-coupled segments, called a self-coupled ring resonator, is proposed. The self-coupling between ring segments provides the same mode perturbation effect as the conventional methods of adding stub, cutting notch, or varying line impedance on the ring resonator. The mode perturbation and transmission-zero generation due to the self-coupling effect are analyzed with the even-odd mode theory. The self-coupled ring resonator can have the capacitive or inductive perturbation simply by controlling the impedance ratio and coupling coefficients of self-coupled sections. For both perturbation cases, the transmission zeros exist at even multiples of the passband center frequency, resulting in wide stopband range. Also, only for the capacitive perturbation case, two transmission zeros are found on both sides of the passband, which brings a pseudo-elliptic bandpass response. In comparison with the regular uniform ring resonator, the self-coupled ring resonator takes shorter ring length, giving the compact size feature when applied to a bandpass filter design. A 2.45-GHz low-temperature co-fired ceramic bandpass filter based on the self-coupled ring resonator was designed to verify the proposed theory. 相似文献
14.
15.
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
16.
Lei Zhu Ke Wu 《Microwave Theory and Techniques》1999,47(10):1938-1948
A joint field/circuit model is proposed in this paper to characterize a class of line-to-ring coupling structures for design and optimization of microstrip dual-mode filters and ring resonator circuits. The generic model is derived from field theory and presented in terms of circuit elements by applying a newly developed numerical deembedding technique called “short-open calibration” in a deterministic method-of-moments scheme. It provides a new design strategy for characterizing and optimizing electrical performance of the line-to-ring coupling structures. Such three-port topologies are explicitly formulated by using an equivalent network having circuit elements calculated by the proposed joint field/circuit model. Three microstrip tightly coupling geometries and their related ring resonators are studied with the extracted J-inverter susceptance parameters. Experiments are performed to validate the joint model and also show coupling characteristics of the three types of line-to-ring circuit for the design of ring resonators and dual-mode filters. With this new technique, an optimized microstrip dual-mode filter is successfully designed and the prediction agrees well with our measurements 相似文献
17.
In this letter, a Balun-bandpass filter (BPF) is proposed by using a dual-mode ring resonator. The Balun-BPF is not a simply combined or integrated component of a BPF and a Balun but a single BPF with the balun function. We obtained the proper balanced outputs and two-pole BPF characteristic by symmetrically placing the output ports at lambda/2 distance from each other on the dual-mode ring resonator. The fabricated Balun-BPF has a bandwidth of 40 MHz and an insertion loss of 2.4 dB at a center frequency of 2.45 GHz. The differences between the two outputs are 180-184deg in phase and within 1dB in magnitude. The measured frequency responses agree well with simulated ones. 相似文献
18.
In this paper, a channel drop filter based on two-dimensional photonic crystal ring resonator (PCRR) is proposed. The proposed structure consists of bus waveguide, dropping waveguide and a ring resonator. We have focused on improving the dropping efficiency and quality factor of the structure by applying different optimization techniques. Optimized channel drop filter using PCRR is designed, and it is extended to drop three different channels by changing the inner rods radius in each ring resonator that act as a demultiplexer. As designed structure drops three different channels such as 1524, 1544 and 1565 nm, the band gap for the structure is calculated and observed by plane-wave expansion method. The normalized transmission spectra and resonance wavelengths for different radius are obtained using two-dimensional finite-difference time-domain method. The proposed PCRR-based demultiplexer has the channel spacing of about 20 nm which fulfils the requirements of coarse wavelength-division multiplexing systems. The size of the demultiplexer is small; hence, it can be utilized for photonic integrated circuits. 相似文献
19.
提出了一种基于多模环形谐振器实现的平衡式带通滤波器, 其主要由加载了电阻和短路枝节的环形谐振器和两对平衡端口构成.所提出的滤波器能够以单个谐振器获得差模的双模响应, 并且具有结构简单, 共模抑制高, 带宽可进行有限控制(4% ~ 9%)的优点.为验证理论预期的可实现性, 在RO4003C基板上设计了一个工作在1.87 GHz的平衡式带通滤波器.实验结果表明该滤波器的20-dB阻抗匹配带宽为8.9%, 中心频率处的插入损耗为0.86 dB, 在1 ~ 3 GHz频率范围内的共模抑制大于30 dB. 相似文献
20.
A dual-mode resonator with square patches attached to inner corners of a conventional microstrip loop resonator is proposed. The two types of coupling between the degenerate modes are described by changing the perturbation's size for realization of either a Chebyshev or an elliptic function filter. A novel type of dual-mode microstrip bandpass filter using degenerate modes of this type of dual-mode resonators is developed. It is shown that the perturbation's size determines the filter characteristic, whether it is Chebyshev characteristic or elliptic characteristic. 相似文献