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2007 Asia-Pacific Microwave Conference最新文献

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Dyadic Green Function of an Imperfectly-Conducting Dual Waveguide Probe 非完全导电双波导探头的并矢格林函数
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554855
M. Havrilla, M. Hyde
{"title":"Dyadic Green Function of an Imperfectly-Conducting Dual Waveguide Probe","authors":"M. Havrilla, M. Hyde","doi":"10.1109/APMC.2007.4554855","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554855","url":null,"abstract":"Single rectangular waveguide probes are frequently employed in characterizing the permittivity of dielectric materials. A new dual rectangular waveguide probe is explored here for simultaneously extracting both permittivity and permeability of a lossy shielding material having dielectric and magnetic properties and backed by a conductor. The material characterization process is facilitated using a magnetic field integral equation formulation which is subsequently solved using the method of moments. The effects of an imperfectly-conducting backing is accommodated through the development of a dyadic Green's function based upon an impedance boundary condition. Experimental measurements of various materials will be performed to validate the analysis.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129621165","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}
引用次数: 1
A Miniaturized Diplexer Using Planar Artificial Transmission Lines for GSM/DCS Applications 基于平面人工传输线的小型GSM/DCS双工器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4555114
K. Li, Chao-Wei Wang, Chang-Fa Yang
{"title":"A Miniaturized Diplexer Using Planar Artificial Transmission Lines for GSM/DCS Applications","authors":"K. Li, Chao-Wei Wang, Chang-Fa Yang","doi":"10.1109/APMC.2007.4555114","DOIUrl":"https://doi.org/10.1109/APMC.2007.4555114","url":null,"abstract":"In this paper, a new planar miniaturized diplexer is proposed for GSM/DCS dual band cellular phone applications. The design is composed of four sections of a recently proposed planar artificial transmission line (ATL) which is used to replace the conventional series quarter-wavelength transformers and the shunt open-circuited stubs. The experimental results reveal that the proposed diplexer features low insertion loss, high isolation and compact size. At the center frequency of the GSM system, the occupied size of the proposed miniaturized diplexer is merely 24.4 mm times 17.6 mm, or equivalently 0.119 lambdag times 0.086 lambdag . The design methodology, simulated and experimental results are discussed throughout the paper.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127057848","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}
引用次数: 15
A Novel Compact EBG Structures With relative Wide Band-gap 一种具有较宽带隙的新型紧凑脑电波结构
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554666
Tao Liu, Xiang-yu Cao, X. Wen, Bao‐qin Lin
{"title":"A Novel Compact EBG Structures With relative Wide Band-gap","authors":"Tao Liu, Xiang-yu Cao, X. Wen, Bao‐qin Lin","doi":"10.1109/APMC.2007.4554666","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554666","url":null,"abstract":"A novel compact electromagnetic band-gap (EBG) structure adopting a coplanar spiral inductor is presented and investigated. This structure significantly enlarges the inductance between neighboring elements and makes the relative bandwidth wider. The simulations results have proved that the period size of the structure is only 0.08lambda0 at the desired band-gap frequency, synchronously the relative bandwidth is held at 27.2%.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127183828","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}
引用次数: 6
Analysis on Memory Effects of Frequency Multipliers for the Frequency Translation of Complex Modulated Signals 复调制信号频率转换中乘频器的记忆效应分析
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4555041
Youngcheol Park
{"title":"Analysis on Memory Effects of Frequency Multipliers for the Frequency Translation of Complex Modulated Signals","authors":"Youngcheol Park","doi":"10.1109/APMC.2007.4555041","DOIUrl":"https://doi.org/10.1109/APMC.2007.4555041","url":null,"abstract":"Memory effects on frequency multipliers have been analyzed in this paper for the application of digital predistortion techniques. Although the memory effects are generally thought to exist in PAs since they handle high power signals and have bias networks, previous predistortion results showed that some amount of memory effects exist in frequency multipliers. The behavioral model of parallel cascade method was compared with the memoryless polynomial model. A frequency tripler with back-to-back Schottky diodes was implemented, and a QPSK test vector was generated at 820 MHz to capture higher-than- third order nonlinearities at 2.46 GHz. As a result, the parallel cascade model shows that the modeling accuracy can be improved by more than 4 dB in error function defined hereafter. In addition, the error function represents that the frequency tripler has memory effects concentrated up to 18 ~ 30 kHz.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122345310","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}
引用次数: 2
Bandwidth Enhancement and Polarization Dependence Elimination of Space-filling Curve Artificial Magnetic Conductors 空间填充曲线人工磁性导体的带宽增强和极化依赖性消除
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4555127
J. McVay, A. Hoorfar, N. Engheta
{"title":"Bandwidth Enhancement and Polarization Dependence Elimination of Space-filling Curve Artificial Magnetic Conductors","authors":"J. McVay, A. Hoorfar, N. Engheta","doi":"10.1109/APMC.2007.4555127","DOIUrl":"https://doi.org/10.1109/APMC.2007.4555127","url":null,"abstract":"This work examines the use of multiple spacefilling curve inclusions as sub-cells to form the basis of a larger inclusion to provide relatively electrically small and self-resonant inclusions for artificial magnetic conductors with enhanced bandwidth performance as well as polarization independence.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"16 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122366857","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}
引用次数: 7
A DMTL Phase Shifter Using Insulation Layer and Saw-Shaped CPW 采用绝缘层和锯齿形CPW的DMTL移相器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554687
Qun Wu, K. Tang, Zi-Rui Feng, Feng-lin Sun, Lewei Li
{"title":"A DMTL Phase Shifter Using Insulation Layer and Saw-Shaped CPW","authors":"Qun Wu, K. Tang, Zi-Rui Feng, Feng-lin Sun, Lewei Li","doi":"10.1109/APMC.2007.4554687","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554687","url":null,"abstract":"The phase shift features of the RF MEMS phase shifter are described. The approach of adding an insulation layer below the RF MEMS bridge to increase phase shift and improve reliability is proposed, in addition, the saw-shaped CPW is used to decrease the return loss introduced by the insulation layer. By using network theory and CST microwave studio simulation tool, the proposed RF MEMS phase shifter is modeled. Simulation results show that the proposed model has the return loss less than -10dB and the insertion loss more than -2dB in 2GHz bandwidth range. For one RF MEMS switch-type bridge, as high as 22.5 degrees phase shift is realized.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126971348","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}
引用次数: 8
A 60GHz Low Power CMOS Demodulator for Multi-Gigabit Wireless Receiver Systems 用于多千兆无线接收系统的60GHz低功耗CMOS解调器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554707
Jae Jin Lee, D. Jung, K. Eun, S. Cho, C. Park
{"title":"A 60GHz Low Power CMOS Demodulator for Multi-Gigabit Wireless Receiver Systems","authors":"Jae Jin Lee, D. Jung, K. Eun, S. Cho, C. Park","doi":"10.1109/APMC.2007.4554707","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554707","url":null,"abstract":"We have developed a low power demodulator for a 60 GHz receiver using 0.13 um CMOS technology. The demodulator consists of two blocks, which are a detector and a post amplifier. The detector detects and demodulates a received signal by using a square-law-detection technique. In this case, because there is no millimeter wave oscillator for frequency conversion, the receiver block becomes simplified, miniaturized, and a structure for low power consumption. A microstrip line has been used for constructing matching networks. Also, a lambda/4 open stub is used for perfect rejection of a 60 GHz signal between the detector and the post amplifier. The post amplifier is composed of an input and output buffer and a gain stage. The cutoff frequency of the post amplifier is 2 GHz, and it has a flat gain within the bandwidth. Thus, the post amplifier acts like a low pass filter, which causes the demodulator not to need any filters and simplifies the system. The 2 Gbps demodulated amplitude-shift-keying (ASK) signal is obtained when the carrier frequency is 60 GHz. The input return loss is less than 25 dB at the center frequency of 60 GHz; the conversion gain of the demodulator is 7 dB when the input power of a demodulator is -13 dBm. The total power consumption is 21.4 mW. These results indicate that the proposed low power demodulator is suitable for 60GHz portable systems.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130616929","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}
引用次数: 0
A 30 W Cartesian Feedback Transmitter with 40 % Efficiency Incorporating an Inverted Doherty Amplifier 采用反向多尔蒂放大器的30w直角反馈发射机，效率为40%
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554960
Hanjin Cho, Min-Su Kim, Jonghyuk Jeong, J. Van, Sung-Chan Jung, Hyun-Chul Park, Kyung-Hoon Lim, Sung-wook Kwon, Jae Young Kim, S. Song, C. Park, Youngoo Yang
{"title":"A 30 W Cartesian Feedback Transmitter with 40 % Efficiency Incorporating an Inverted Doherty Amplifier","authors":"Hanjin Cho, Min-Su Kim, Jonghyuk Jeong, J. Van, Sung-Chan Jung, Hyun-Chul Park, Kyung-Hoon Lim, Sung-wook Kwon, Jae Young Kim, S. Song, C. Park, Youngoo Yang","doi":"10.1109/APMC.2007.4554960","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554960","url":null,"abstract":"We present a 30 W Cartesian feedback transmitter with an efficiency of 40 % and an adjacent channel leakage power ratio (ACLR) of -51 dBc for 859 MHz band pi/4-DQPSK applications. The high efficiency of the system was achieved by a significant efficiency improvement for the final amplifier stage using a load modulation technique. The implemented Cartesian feedback transmitter, using a Doherty power amplifier, exhibited a 3rd order inter-modulation distortion (IMD3) improvement of 27 dB for a two-tone signal at an output power level of 45 dBm. It also had ACLR improvement of 16.2 dB for the pi/4-DQPSK signal at an output power level of 45 dBm. The system performed with an efficiency as high as 40 % which was an improved value by about 7 % points as a consequence of the high efficiency characteristics of the inverted Doherty amplifier.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131960830","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}
引用次数: 2
Dual-Fed Microstrip Patch with Higher-Order Radiating Mode Achieving Port-to-Port Isolation 双馈微带贴片与高阶辐射模式实现端口到端口隔离
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4555120
L. Chiu, Q. Xue
{"title":"Dual-Fed Microstrip Patch with Higher-Order Radiating Mode Achieving Port-to-Port Isolation","authors":"L. Chiu, Q. Xue","doi":"10.1109/APMC.2007.4555120","DOIUrl":"https://doi.org/10.1109/APMC.2007.4555120","url":null,"abstract":"This paper presents design guide and applications of a newly proposed dual-fed patch antenna. Four shunt stubs and slots form slow-wave edges and reduce the length of radiating edge by 40 %. The slow-wave edge and non-central feedings excite the first higher-order mode for radiation. The proposed design provides broadside radiation pattern with antenna gain of 7 dBi. The signal injected to one port can be radiated by the half patch and no signal is leaked to another port. Port-to-port isolation is achieved and it is proposed in the dual-fed linearly polarized antenna. The dual-fed structure is convenient for the direct integration to the balanced circuits without use of power divider/combiner or balun. The proposed design is useful to compact balanced active integrated antenna designs. The disadvantage of power divider such as electrically large size and lumped element requirement can be eliminated. Most importantly, the devices working with the proposed antenna operate independently to avoid unwanted feedback and oscillation.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132334706","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}
引用次数: 1
Analysis of an Arbitrarily Rotated Slot on a Conducting Spherical Cavity 导电球腔上任意旋转槽的分析
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554939
E. Khoomwong, C. Phongcharoenpanich
{"title":"Analysis of an Arbitrarily Rotated Slot on a Conducting Spherical Cavity","authors":"E. Khoomwong, C. Phongcharoenpanich","doi":"10.1109/APMC.2007.4554939","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554939","url":null,"abstract":"The formulation for analyzing an arbitrarily rotated rectangular slot antenna at arbitrary location on a conducting spherical cavity Is considered by using the technique of dyadic Green's function. The convergence tests of solutions and some radiation characteristics are investigated for various cases when the physical parameters, such as slot orientations and wide range of cavity sizes, are changed.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130989745","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}
引用次数: 4
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