Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782280
Yong-sheng Dai, Zhong-Hua Ye, Bao-Shan Li, De-Long Lu, Yuan You, Gao-Pin Qi, Chao-Yu Wang, Zhi-Dong song, Fei Wang
This letter outlines the design and manufacture of a miniaturized bandpass filter realized by low-temperature cofired ceramic (LTCC) technology for bluetooth applications. The bandpass filter with a central frequency of 2450 MHz and a 100 MHz passband is designed as a three-dimensional (3-D) structure based on lumped components. Experimental measurements were compared with modeling. The insertion losses in the passband (100 MHz) were less than 1.2 dB and the attenuation was more than 20 dB in the stop band. The area occupied by the filter is 1.6times0.8times0.6 mm3.
{"title":"A Miniaturized and Low Insertion Loss LTCC Filter with Two Finite Transmission Zeros for Bluetooth Application","authors":"Yong-sheng Dai, Zhong-Hua Ye, Bao-Shan Li, De-Long Lu, Yuan You, Gao-Pin Qi, Chao-Yu Wang, Zhi-Dong song, Fei Wang","doi":"10.1109/IMWS.2008.4782280","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782280","url":null,"abstract":"This letter outlines the design and manufacture of a miniaturized bandpass filter realized by low-temperature cofired ceramic (LTCC) technology for bluetooth applications. The bandpass filter with a central frequency of 2450 MHz and a 100 MHz passband is designed as a three-dimensional (3-D) structure based on lumped components. Experimental measurements were compared with modeling. The insertion losses in the passband (100 MHz) were less than 1.2 dB and the attenuation was more than 20 dB in the stop band. The area occupied by the filter is 1.6times0.8times0.6 mm3.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123999254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782266
R. Gajaweera, L. Lind
An easy to follow general procedure is given here to synthesize a coupling matrix for a physically asymmetric or/and asynchronously tuned network exhibiting the generalized Chebyshev frequency characteristics. In this procedure we show that a physically realizable coupling matrix can be obtained for a given S21(s) by first choosing a suitable structure that can support the required number of transmission zeros with a sufficient number of non-zero couplings. Then a system of non-linear equations can be written to find the elements of the coupling matrix of the selected structure using the Newton-Raphson method, which guarantees rapid convergence.
{"title":"Coupling Matrix Synthesis for Asymmetric Filter Topologies","authors":"R. Gajaweera, L. Lind","doi":"10.1109/IMWS.2008.4782266","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782266","url":null,"abstract":"An easy to follow general procedure is given here to synthesize a coupling matrix for a physically asymmetric or/and asynchronously tuned network exhibiting the generalized Chebyshev frequency characteristics. In this procedure we show that a physically realizable coupling matrix can be obtained for a given S21(s) by first choosing a suitable structure that can support the required number of transmission zeros with a sufficient number of non-zero couplings. Then a system of non-linear equations can be written to find the elements of the coupling matrix of the selected structure using the Newton-Raphson method, which guarantees rapid convergence.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124834934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782268
H. Liu, K. L. Ford, R. Langley
A novel planar bandpass lump-loaded Frequency selective surface (FSS) is presented. Based on the artificial transmission line current loop realized by the lumped loaded elements, this novel bandpass FSS has overcome the traditional resonant type FSS limitation of the mutual dependence between the dimensions and bandwidth. A lumped-loaded band pass FSS whose unit cell is only lambda/20 with 18.6% bandwidth is manufactured and tested.
{"title":"Novel Planar Band Pass Lump-Loaded Frequency Selective Surface","authors":"H. Liu, K. L. Ford, R. Langley","doi":"10.1109/IMWS.2008.4782268","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782268","url":null,"abstract":"A novel planar bandpass lump-loaded Frequency selective surface (FSS) is presented. Based on the artificial transmission line current loop realized by the lumped loaded elements, this novel bandpass FSS has overcome the traditional resonant type FSS limitation of the mutual dependence between the dimensions and bandwidth. A lumped-loaded band pass FSS whose unit cell is only lambda/20 with 18.6% bandwidth is manufactured and tested.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129801651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782285
Haiwen Liu, F. Tong, Xiaohua Li
An improved spurline structure with two rejection bands is presented in this paper, which consists of asymmetrical spurline resonators and embedded directly into microstrip line. Asymmetrical spurline resonators provide dual-bandgap characteristics and slow-wave effect. Furthermore, asymmetrical spurline structure with dual rejection bands is proposed to reduce the higher harmonics of microwave power amplifiers. To evaluate the effect of asymmetrical spurline resonators on microwave amplifiers, two InGaP HBT power amplifiers were designed and fabricated. One of them has asymmetrical spurline structure at the output section, while the other has a conventional 50-Omega microstrip line only. Results show that asymmetrical spurline structure suppresses the second and third harmonics more than 27 dB at the output and yields improved power added efficiency (PAE) and output power by 6-8% and 1-4%, respectively.
{"title":"Asymmetrical Spurline Resonator Design and its Application to Power Amplifiers","authors":"Haiwen Liu, F. Tong, Xiaohua Li","doi":"10.1109/IMWS.2008.4782285","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782285","url":null,"abstract":"An improved spurline structure with two rejection bands is presented in this paper, which consists of asymmetrical spurline resonators and embedded directly into microstrip line. Asymmetrical spurline resonators provide dual-bandgap characteristics and slow-wave effect. Furthermore, asymmetrical spurline structure with dual rejection bands is proposed to reduce the higher harmonics of microwave power amplifiers. To evaluate the effect of asymmetrical spurline resonators on microwave amplifiers, two InGaP HBT power amplifiers were designed and fabricated. One of them has asymmetrical spurline structure at the output section, while the other has a conventional 50-Omega microstrip line only. Results show that asymmetrical spurline structure suppresses the second and third harmonics more than 27 dB at the output and yields improved power added efficiency (PAE) and output power by 6-8% and 1-4%, respectively.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"65 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132026704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782263
K. Eccleston
The fractal meandering approach to microstrip circuit miniaturization is limited by the need to maintain characteristic impedance. In this work we show that uniform and non-uniform shunt loading can be used yield a further level of miniaturization of Koch fractal meandered microstrips and is applied to the miniaturization of a 1 GHz bandstop filter. The miniaturized filter has an area 11% of the area of a filter using straight microstrips alone, and 57% of the area of a filter miniaturized by second order fractal meandering alone.
{"title":"Shunt-Loaded Fractal-Meandered Microstrip","authors":"K. Eccleston","doi":"10.1109/IMWS.2008.4782263","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782263","url":null,"abstract":"The fractal meandering approach to microstrip circuit miniaturization is limited by the need to maintain characteristic impedance. In this work we show that uniform and non-uniform shunt loading can be used yield a further level of miniaturization of Koch fractal meandered microstrips and is applied to the miniaturization of a 1 GHz bandstop filter. The miniaturized filter has an area 11% of the area of a filter using straight microstrips alone, and 57% of the area of a filter miniaturized by second order fractal meandering alone.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116659209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782258
Q. Chu, Huan Wang
This paper describes the planar quasi-elliptic filters with EM coupled open-loops having an inline resonator alignment. For two coupled open-loops, the coupled sides with the maximum magnetic field are combined with their open gaps with the maximum electric field, creating the mixed electric and magnetic coupling. By adjusting the distance between this two loops and gap position of each loop, a desired coupling coefficient and a controllable transmission zero can be simultaneously obtained. The shapes of the open-loop can be either a rectangle or triangle, but the latter is preferred to the former since the coupling between the EM coupled triangular pairs is tighter and more controllable. A backed aperture can be etched on the ground plane underneath the coupled lines of two adjacent loops to further enhance both electric and magnetic coupling, and to help to realize a wider bandwidth and closer-to-passband transmission zero. High order filters can be constructed by cascading several EM coupled open-loop pairs to create multiple transmission zeros.
{"title":"Planar Quasi-Elliptic Filters with Inline EM Coupled Open-Loop Resonators","authors":"Q. Chu, Huan Wang","doi":"10.1109/IMWS.2008.4782258","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782258","url":null,"abstract":"This paper describes the planar quasi-elliptic filters with EM coupled open-loops having an inline resonator alignment. For two coupled open-loops, the coupled sides with the maximum magnetic field are combined with their open gaps with the maximum electric field, creating the mixed electric and magnetic coupling. By adjusting the distance between this two loops and gap position of each loop, a desired coupling coefficient and a controllable transmission zero can be simultaneously obtained. The shapes of the open-loop can be either a rectangle or triangle, but the latter is preferred to the former since the coupling between the EM coupled triangular pairs is tighter and more controllable. A backed aperture can be etched on the ground plane underneath the coupled lines of two adjacent loops to further enhance both electric and magnetic coupling, and to help to realize a wider bandwidth and closer-to-passband transmission zero. High order filters can be constructed by cascading several EM coupled open-loop pairs to create multiple transmission zeros.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125302817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782276
Wai‐Wa Choi, K. Tam
A novel miniaturized microstrip dual-mode bandpass filter with simultaneous size reduction and spurious responses suppression is proposed. In this new filter structure, the stepped-impedance resonator (SIR) technique is used to not only shorten the resonator size but also suppress its spurious responses. A prototype dual-mode bandpass filter centered at 1.6 GHz with 3% FBW is designed and experimentally characterized. This new filter achieves 33% size diminution when compared with the conventional structure. In addition, spurious responses at 2f0 and 3f0 are suppressed by 20 dB and 18 dB respectively.
{"title":"A Microstrip SIR Dual-Mode Bandpass Filter with Simultaneous Size Reduction and Spurious Responses Suppression","authors":"Wai‐Wa Choi, K. Tam","doi":"10.1109/IMWS.2008.4782276","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782276","url":null,"abstract":"A novel miniaturized microstrip dual-mode bandpass filter with simultaneous size reduction and spurious responses suppression is proposed. In this new filter structure, the stepped-impedance resonator (SIR) technique is used to not only shorten the resonator size but also suppress its spurious responses. A prototype dual-mode bandpass filter centered at 1.6 GHz with 3% FBW is designed and experimentally characterized. This new filter achieves 33% size diminution when compared with the conventional structure. In addition, spurious responses at 2f0 and 3f0 are suppressed by 20 dB and 18 dB respectively.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127639568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782267
Jia‐lin Li, S. Qu, Q. Xue
Based on a square patch resonator, a compact dual-mode band-pass filter is studied in this paper. The size reduction of the developed filter is simply achieved by etching a dual-cross slot on the patch. Studies indicate that with this arrangement, the size can be reduced to 26.7% as compared to the conventional patch resonator. Meanwhile, a pair of transmission zeros close to the pass band improves its selectivity. Both measurements and simulations are presented and compared in the paper.
{"title":"Compact Dual-Mode Patch Resonator for Filter Applications","authors":"Jia‐lin Li, S. Qu, Q. Xue","doi":"10.1109/IMWS.2008.4782267","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782267","url":null,"abstract":"Based on a square patch resonator, a compact dual-mode band-pass filter is studied in this paper. The size reduction of the developed filter is simply achieved by etching a dual-cross slot on the patch. Studies indicate that with this arrangement, the size can be reduced to 26.7% as compared to the conventional patch resonator. Meanwhile, a pair of transmission zeros close to the pass band improves its selectivity. Both measurements and simulations are presented and compared in the paper.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133449424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782305
L. Du, Y. Yang, Z. Ye, J.L. Yang, R. Chen
Based on the finite element approximation and nonoverlapping domain decomposition, an efficient parallel algorithm of the finite-element time-domain method is presented for the analysis of the photonic band gap structure. The unconditionally stable implicit Newmark-beta scheme is used in the time domain finite-element tearing and interconnecting algorithm. Through the use of Lagrange multipliers, the field continuity is enforced explicitly along the edges shared by more than two subdomains and implicitly at the interfaces between two subdomains. In this way, the direct sparse solver is used for each subdomain system and the large global problem is reduced to a much smaller interface problem. Thus, the final system matrix equation is solved by Krylov subspace solvers and a Neumann boundary condition is obtained at the interfaces between all the subdomains. Therefore, the fields inside each subdomain are then calculated by this Neumann boundary condition. Numerical results demonstrate that our proposed method is extremely efficient for the analysis of the photonic band gap structures.
{"title":"Time-Domain Analysis of Photonic Band Gap Structure by a Finite-Element Tearing and Interconnecting Algorithm","authors":"L. Du, Y. Yang, Z. Ye, J.L. Yang, R. Chen","doi":"10.1109/IMWS.2008.4782305","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782305","url":null,"abstract":"Based on the finite element approximation and nonoverlapping domain decomposition, an efficient parallel algorithm of the finite-element time-domain method is presented for the analysis of the photonic band gap structure. The unconditionally stable implicit Newmark-beta scheme is used in the time domain finite-element tearing and interconnecting algorithm. Through the use of Lagrange multipliers, the field continuity is enforced explicitly along the edges shared by more than two subdomains and implicitly at the interfaces between two subdomains. In this way, the direct sparse solver is used for each subdomain system and the large global problem is reduced to a much smaller interface problem. Thus, the final system matrix equation is solved by Krylov subspace solvers and a Neumann boundary condition is obtained at the interfaces between all the subdomains. Therefore, the fields inside each subdomain are then calculated by this Neumann boundary condition. Numerical results demonstrate that our proposed method is extremely efficient for the analysis of the photonic band gap structures.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"25 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114124166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782293
Zi-Wei Mu, Yali Qin, Yu-jie Zhao, Zhefu Wu
A small-sized high-performance bandpass filter design is presented in this paper. The LTCC multilayered structure and Stepped Impedance Resonators (SIR) are employed to miniaturize the filter size, and through the introduction of transmission zeros can obtain a higher stopband suppression. This paper highlighted discusses the factors that cause the filter insertion loss. The designed filter has superior passband characteristics with central frequency 2.45 GHz and package size is 2.5 mm times 2.0 mm times 0.9 mm. The simulation results shown the proposed filter completely meet the needs of bluetooth/WLAN wireless communication systems.
提出了一种小型高性能带通滤波器的设计方案。采用LTCC多层结构和阶跃阻抗谐振器(SIR)使滤波器尺寸小型化，通过引入传输零点可以获得更高的阻带抑制。本文着重讨论了引起滤波器插入损耗的因素。设计的滤波器具有优异的通带特性，中心频率为2.45 GHz，封装尺寸为2.5 mm × 2.0 mm × 0.9 mm。仿真结果表明，该滤波器完全满足蓝牙/WLAN无线通信系统的需求。
{"title":"Design of Multilayer LTCC Bandpass Filter with Low Loss and High Suppression Using SIR Structure","authors":"Zi-Wei Mu, Yali Qin, Yu-jie Zhao, Zhefu Wu","doi":"10.1109/IMWS.2008.4782293","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782293","url":null,"abstract":"A small-sized high-performance bandpass filter design is presented in this paper. The LTCC multilayered structure and Stepped Impedance Resonators (SIR) are employed to miniaturize the filter size, and through the introduction of transmission zeros can obtain a higher stopband suppression. This paper highlighted discusses the factors that cause the filter insertion loss. The designed filter has superior passband characteristics with central frequency 2.45 GHz and package size is 2.5 mm times 2.0 mm times 0.9 mm. The simulation results shown the proposed filter completely meet the needs of bluetooth/WLAN wireless communication systems.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124907668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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