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1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)最新文献

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New measurement technique of the surface impedance of superconductors using the probe-coupling type microstripline resonator 利用探针耦合型微带线谐振器测量超导体表面阻抗的新技术
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-12-01 DOI: 10.1109/APMC.1999.833734
D. Okai, M. Kusunoki, M. Mukaida, S. Ohshima
{"title":"New measurement technique of the surface impedance of superconductors using the probe-coupling type microstripline resonator","authors":"D. Okai, M. Kusunoki, M. Mukaida, S. Ohshima","doi":"10.1109/APMC.1999.833734","DOIUrl":"https://doi.org/10.1109/APMC.1999.833734","url":null,"abstract":"We have developed a probe-coupling type microstripline resonator method for accurate measurement of the surface impedance of superconductors. By this improved microstripline resonator method, the surface impedance can be measured without attaching any contacts to the film. This paper reports the accurate and reproducible measurement process of surface impedance using the probe-coupling type microstripline resonator. The surface impedance of a YBCO thin film was measured using this technique. The measured results revealed that this technique may be used for the accurate measurement of surface impedance.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115864230","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
Microstrip adaptive array antenna using semiconductor plasma and genetic algorithm 采用半导体等离子体和遗传算法的微带自适应阵列天线
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-12-01 DOI: 10.1109/APMC.1999.828052
T. Fukusako, H. Shiraishi, S. Itakura, Y. Kasano, N. Mita
{"title":"Microstrip adaptive array antenna using semiconductor plasma and genetic algorithm","authors":"T. Fukusako, H. Shiraishi, S. Itakura, Y. Kasano, N. Mita","doi":"10.1109/APMC.1999.828052","DOIUrl":"https://doi.org/10.1109/APMC.1999.828052","url":null,"abstract":"This paper proposes an optically controllable microstrip adaptive array using the semiconductor plasma and the genetic algorithm. The array antenna consists of the slot-coupled microstrip patch antennas whose weights are controlled by optically induced semiconductor plasma. The plasma densities an determined by the GA, and the validity for the null steering and beam forming technique was shown.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122195195","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
A two-layer self-diplexing patch antenna with a hole 带孔的两层自双工贴片天线
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-12-01 DOI: 10.1109/APMC.1999.828073
Y. Rikuta, H. Arai
{"title":"A two-layer self-diplexing patch antenna with a hole","authors":"Y. Rikuta, H. Arai","doi":"10.1109/APMC.1999.828073","DOIUrl":"https://doi.org/10.1109/APMC.1999.828073","url":null,"abstract":"This paper presents a new two-layer self-diplexing antenna for mobile satellite communications which consists of a rectangular bottom patch fed via a hole in an upper patch. The isolation of this antenna is suppressed less than -25 dB by selecting the feed position in the upper patch.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121351043","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
A proposal of adaptive multicode transmission for DS-SS system under ISM interference environments 一种ISM干扰环境下DS-SS系统的自适应多码传输方案
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.828081
S. Unawong, S. Miyamoto, N. Morinaga
{"title":"A proposal of adaptive multicode transmission for DS-SS system under ISM interference environments","authors":"S. Unawong, S. Miyamoto, N. Morinaga","doi":"10.1109/APMC.1999.828081","DOIUrl":"https://doi.org/10.1109/APMC.1999.828081","url":null,"abstract":"Wireless communication systems operating in the presence of the electromagnetic interference radiated from ISM (Industrial, Scientific, and Medical) apparatus are drastically degraded in performance by the effects of the interference. In this paper, to design a direct sequence-spread spectrum (DS-SS) system to be effective and flexible to operate under ISM interference environments, the DS-SS system which employs an adaptive multicode transmission scheme is introduced. Based on computer simulation, the bit error rate and the throughput performances of the adaptive multicode DS-SS system are studied. Simulation results illustrate that the DS-SS system with the adaptive multicode transmission achieves good performance even operating under ISM interference environments.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115511476","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 novel printed antenna with broadband circular polarization 一种新型宽带圆极化印刷天线
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.828070
Y. Qian, W. Deal, J. Sor, T. Itoh
{"title":"A novel printed antenna with broadband circular polarization","authors":"Y. Qian, W. Deal, J. Sor, T. Itoh","doi":"10.1109/APMC.1999.828070","DOIUrl":"https://doi.org/10.1109/APMC.1999.828070","url":null,"abstract":"A novel printed antenna with broadband circular polarization (CP) characteristics is presented. The antenna design is based on a recently developed uniplanar quasi-Yagi. The antenna measures VSWR<2 and AR<3 dB in the frequency range from 3.40 to 6.34 GHz (60.4%). The bandwidth is more than twice that of the best planar CP antenna to our knowledge. The measured dual-linear pattern at 5 GHz shows that the antenna has excellent CP performance, with its AR below 6 dB over a wide range of scan angles (/spl plusmn/80/spl deg/) from the mainbeam direction.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116895175","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
Intra building cell stations placement prediction model for personal communication telephone (PCT) system in 1.9 GHz band 1.9 GHz频段个人通信电话(PCT)系统的楼内基站布局预测模型
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.833689
T. Paungma, P. Boonsrimuang, P. Moungnoul
{"title":"Intra building cell stations placement prediction model for personal communication telephone (PCT) system in 1.9 GHz band","authors":"T. Paungma, P. Boonsrimuang, P. Moungnoul","doi":"10.1109/APMC.1999.833689","DOIUrl":"https://doi.org/10.1109/APMC.1999.833689","url":null,"abstract":"This paper presents the appropriate indoor cell stations layout of Personal Communication Telephone (PCT) system in Thailand. This layout is designed for rather big and very big buildings based on frequency reuse technique for each floor by considering vertical and horizontal wave propagation. Cell stations were installed for modeling at the Telecommunication Building, Faculty of Engineering, King Mongkut's Institute of Technology, Ladkrabang. By virtue of computer technology and employing propagation loss factors in the establishment of the equation, the measured signal levels were then compared with theoretical signal levels. The outcome of the verification was satisfactory. The results will be used as a guideline in designing indoor cell stations layout to improve the quality of performance of the PCT system.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127441813","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
High efficiency power amplifier design using a simplified approach 采用简化方法设计高效率功率放大器
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.833675
T. Ng, B. Ooi, M. Leong, J.Y. Ma, H.S. Ong, S. Chew
{"title":"High efficiency power amplifier design using a simplified approach","authors":"T. Ng, B. Ooi, M. Leong, J.Y. Ma, H.S. Ong, S. Chew","doi":"10.1109/APMC.1999.833675","DOIUrl":"https://doi.org/10.1109/APMC.1999.833675","url":null,"abstract":"A high efficiency power amplifier is implemented using a simplified design method. The approach utilizes small signal S-parameter data only. A high efficiency power amplifier with a maximum power added efficiency of 68.8 %, a nominal power gain of 8.6 dB and 21 dBm output power at 7.5 GHz was implemented. The high efficiency performance is obtained from proper selection of the second harmonic termination for a class AB power amplifier.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124913407","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
A broadband air-filled stacked U-slot patch antenna 宽带充气堆叠u型槽贴片天线
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.828078
C.L. Lee, B. Ooi, X.D. Zhou
{"title":"A broadband air-filled stacked U-slot patch antenna","authors":"C.L. Lee, B. Ooi, X.D. Zhou","doi":"10.1109/APMC.1999.828078","DOIUrl":"https://doi.org/10.1109/APMC.1999.828078","url":null,"abstract":"The characteristic of a novel rectangular air-filled stacked patch with an offset L-shaped probe are experimentally investigated. The top patch and lower U-slot patch are all supported by thin basswoods at the four corners and the height for the lower U-slot patch is approximately 10% of the designed wavelength. An impedance bandwidth of 44.4% and average gain of approximately 15 dB can be achieved.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125167243","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: 22
Analysis and design of radial waveguide E-plane hybrids 径向波导e -平面混合波导的分析与设计
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.829918
M. Kishihara, T. Kawai, Y. Kokubo, I. Ohta
{"title":"Analysis and design of radial waveguide E-plane hybrids","authors":"M. Kishihara, T. Kawai, Y. Kokubo, I. Ohta","doi":"10.1109/APMC.1999.829918","DOIUrl":"https://doi.org/10.1109/APMC.1999.829918","url":null,"abstract":"This paper presents a computer-aided design of two different types of radial waveguide E-plane 3 dB hybrids utilizing a newly derived magnetic impedance matrix. One is a novel configuration composed of four E-plane waveguides radially coupled to a circular cavity. The other is a modified rat-race circuit consisting of a coaxial cavity and four E-plane waveguides with an impedance transformer. As a result of optimizing the circuit structure and dimensions, a desirable hybrid performance is realized for both types. In addition, computed results by an electromagnetic field simulator are shown to verify this analytical and design method.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"520 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123573233","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
900 MHz/1.8 GHz thin-film microwave bandpass filter 900 MHz/1.8 GHz薄膜微波带通滤波器
1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473) Pub Date : 1999-11-30 DOI: 10.1109/APMC.1999.833684
Ming Yu, Han Wu, Y. Chan
{"title":"900 MHz/1.8 GHz thin-film microwave bandpass filter","authors":"Ming Yu, Han Wu, Y. Chan","doi":"10.1109/APMC.1999.833684","DOIUrl":"https://doi.org/10.1109/APMC.1999.833684","url":null,"abstract":"900 MHz and 1.8 GHz microwave thin-film bandpass filters on Al/sub 2/O/sub 3/ substrates are designed, fabricated and characterized. Based on the high-Q values of passive components, spiral inductors and MIM capacitors for example, a low insertion loss of thin-film bandpass filter can be realized with a minimized chip area. The insertion loss was 3 dB for a 1.8 GHz filter, and was 5 dB for a 900 MHz filter.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126969479","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
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