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2005 Asia-Pacific Microwave Conference Proceedings最新文献

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Linear power amplifier with a modified predistortion compensation for NCDMA applications 用于NCDMA的改进预失真补偿线性功率放大器
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606221
Y. Kao, Wei-Chung Chen
{"title":"Linear power amplifier with a modified predistortion compensation for NCDMA applications","authors":"Y. Kao, Wei-Chung Chen","doi":"10.1109/APMC.2005.1606221","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606221","url":null,"abstract":"The selection of the matched transistor pair in a cascaded architecture for predistortion compensation is nontrivial. In this study, a modified architecture of predistortion with two paths is presented for the high power amplifier. The goal is to develop a 10W linear power amplifier with LDMOS transistor for 8 channels NCDMA repeater from 870 to 880MHz. With the modified scheme, the improvement of intermodulation is larger than 10dB and spurious is less than 50dBc.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366831","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
Design and simulation of MEMS based humidity sensor 基于MEMS的湿度传感器设计与仿真
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606536
Z. C. Alex, Govardhan K
{"title":"Design and simulation of MEMS based humidity sensor","authors":"Z. C. Alex, Govardhan K","doi":"10.1109/APMC.2005.1606536","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606536","url":null,"abstract":"Humidity plays a very major role in various industries. Monitoring and controlling the humidity is of great importance for the reliable operation of various systems. Micro cantilever systems have been found to be highly suited for sensing purposes. A micro cantilever humidity sensor based on capacitive principle is designed and various analyses were performed on the sensor. The polyimide being the sensing layer is coated on the cantilever beam. The beam is provided with movable electrode. The deflection of beam causes capacitance change, which is related to the change in humidity. The design also incorporates a platinum based temperature sensor to compensate for change in humidity due to temperature and also a platinum based heater to regenerate the sensing layer for obtaining next measurement. The structure was designed using Coventorware and Intellisuite. The structure showed a good linearity and good sensitivity in the regions from 10-40 % RH in all temperatures in human adaptive ranges. The beam had an appreciable deflection causing a notable change in capacitance. The sensitivity was in order of pico to femto farads per %RH change.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117004937","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: 3
Sample rate conversion using Walsh-transform for radar receiver 基于沃尔什变换的雷达接收机采样率转换
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606345
Bai Liyun, Wen Bi-yang, Shen Wei, W. XianRong
{"title":"Sample rate conversion using Walsh-transform for radar receiver","authors":"Bai Liyun, Wen Bi-yang, Shen Wei, W. XianRong","doi":"10.1109/APMC.2005.1606345","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606345","url":null,"abstract":"Current SRC methods can consume a large fraction of the digital signal processor resources leaving limited computational power for other tasks. Reducing the computational requirements for SRC is a key element for the success and profitability of SWR systems. An efficient decimation architecture using Walsh transform for HF surface wave radar receivers is presented. The proposed takes into consideration the complexities of algorithm due to the relatively high data rate and the intensive filter operations involved in commonly used decimators, which substitute multiplication-addition for addition-subtraction imposed on filter. Performances illustrative are compared with that of other similar decimators. Experiments results show that the new decimators outperform others, which is suited for real time signal processing in DSP, such as ADSP2 1060.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117008581","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: 10
Laminated ceramic interdigital bandpass filter 层压陶瓷数字间带通滤波器
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1607085
Xiong-Xin Tang, De-Long Lu, Jianqiang Wang, Jiyuan Shi, Bo He
{"title":"Laminated ceramic interdigital bandpass filter","authors":"Xiong-Xin Tang, De-Long Lu, Jianqiang Wang, Jiyuan Shi, Bo He","doi":"10.1109/APMC.2005.1607085","DOIUrl":"https://doi.org/10.1109/APMC.2005.1607085","url":null,"abstract":"One new type of laminated ceramic interdigital bandpass filter manufactured by low temperature co-fired ceramic (LTCC) technology is presented in this article. The designed filter is constructed of conductive patterns, which are printed on various ceramic sheets. The patterns include three stepped-impedance resonators arranged in interdigital manner, and series resonance branches for transmission zeros. The simulated result for this component shows broad bandpass width plus enhanced bandstop rejection.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128390323","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
Rutile-loaded slotted rectangular waveguide array for medical applications 医用金红石载槽矩形波导阵列
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606264
R.C. Gupta, S.P. Singh
{"title":"Rutile-loaded slotted rectangular waveguide array for medical applications","authors":"R.C. Gupta, S.P. Singh","doi":"10.1109/APMC.2005.1606264","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606264","url":null,"abstract":"In this paper, a linear phased array of longitudinal slots in narrow wall of rutile-loaded rectangular waveguide in direct contact with heating medium is theoretically analyzed and reported, which is useful for treatment of cancer in abdomen or chest region. Each slot is excited by a coaxial line probe. It is proposed that the interior of the waveguide be filled with very low loss rutile material to provide a better impedance match to biological tissue. By applying Fresnel-Kirchhoff scalar diffraction field theory, the expression for electric field in heating medium is derived. The contour distribution of specific absorption rate (SAR) in x-z plane and SAR distribution in z-direction due to slotted waveguide array as direct contact applicator is evaluated at 433 MHz. The parameters such as penetration depth, power absorption coefficient and spot size are obtained for slotted waveguide array. The results of slotted waveguide array are compared with those of a single waveguide slot operating at same frequency. It is shown that by changing the phase and amplitude of excitation of each slot of the array, relative amplitude and position of the hot spot can be changed. Results demonstrate that slotted waveguide array offers improvement in SAR distribution and penetration depth.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128503869","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 perturbation particle swarm optimization for the synthesis of the radiation pattern of antenna array
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606688
Zhihao Yuan, R. Jin, Jun-ping Geng, Yu Fan, Jia Lao, Jiaqiang Li, X. Rui, Zhijiang Fang, Jing Sun
{"title":"A perturbation particle swarm optimization for the synthesis of the radiation pattern of antenna array","authors":"Zhihao Yuan, R. Jin, Jun-ping Geng, Yu Fan, Jia Lao, Jiaqiang Li, X. Rui, Zhijiang Fang, Jing Sun","doi":"10.1109/APMC.2005.1606688","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606688","url":null,"abstract":"In this paper, a modified particle swarm optimization algorithm is proposed, in which special techniques such as global best perturbation and inertia weight jump threshold are adopted. The convergence speed and accuracy are improved. Using it, the problems such as prematurity and easily trapping in local optima can be avoided. The experiments of some benchmark functions demonstrate that it achieves relatively high performance. Optimization of the radiation pattern of antenna array using the PPSO is also presented.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128540925","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
TD-EFIE approach to transient analysis of arbitrarily-shaped conductors 任意形状导体瞬态分析的TD-EFIE方法
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606633
Jiang Guang-xing, C. Wei, Zhu Hong-bo
{"title":"TD-EFIE approach to transient analysis of arbitrarily-shaped conductors","authors":"Jiang Guang-xing, C. Wei, Zhu Hong-bo","doi":"10.1109/APMC.2005.1606633","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606633","url":null,"abstract":"The time domain electric field integral equation (TD-EFIE) approach to analysis of transient electromagnetic response of various kinds of antennas and scatterers is presented in this paper. The method is applicable to both closed and open bodies because of the usage of EFIE. In the analysis, impressed sources and the shape of the conductors are arbitrarily given. The conducting surface is modeled by planar triangular patches for numerical purposes. The effects of temporal basis function on the results are studies firstly, which shows that the choice of temporal functions is vital importance. To overcome the late-time oscillation and keep the accuracy of the solution, an averaging scheme has been proposed. A number of numerical examples are given and the results are compared with ones obtained from inverse discrete Fourier transform (IDFT). The good agreement between them shows the correctness and effectiveness of the method proposed.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128344430","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
Direct transmission of ultra wide band signals using single mode radio-over-fiber system 使用单模光纤无线电系统直接传输超宽带信号
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606524
C.M. Tan, L. Ong, M. Yee, B. Luo, P.K. Tang
{"title":"Direct transmission of ultra wide band signals using single mode radio-over-fiber system","authors":"C.M. Tan, L. Ong, M. Yee, B. Luo, P.K. Tang","doi":"10.1109/APMC.2005.1606524","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606524","url":null,"abstract":"This paper investigates the transmission characteristic of ultra wide band radio through a single mode radio-over-fiber system. The UWB pulse radio has a frequency span of 3GHz to 6GHz and is transmitted through a single mode optical fiber using a laser and a photodiode. BER measurements will be presented to evaluate the performance of the ultra wide band radio.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129239817","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: 17
Pattern reconfigurable millimeter wave microstrip quasi-Yagi active antenna 方向图可重构毫米波微带准八木有源天线
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1606388
S. Xiao, Z. Shao, M. Fujise
{"title":"Pattern reconfigurable millimeter wave microstrip quasi-Yagi active antenna","authors":"S. Xiao, Z. Shao, M. Fujise","doi":"10.1109/APMC.2005.1606388","DOIUrl":"https://doi.org/10.1109/APMC.2005.1606388","url":null,"abstract":"A pattern reconfigurable microstrip quasi-Yagi active antenna is design by the finite-difference time-domain (FDTD) method in this paper. This antenna operates at 50GHz and its radiation patterns can be reconfigured by using four switchable states. The antenna can be applied to half-duplex communication and millimeter wave identification systems.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124659531","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: 5
High speed digital hybrid PLL frequency synthesizer 高速数字混合锁相环频率合成器
2005 Asia-Pacific Microwave Conference Proceedings Pub Date : 2005-12-04 DOI: 10.1109/APMC.2005.1607062
Hun-Hee Lee, Wonhui Park, H. Ryu
{"title":"High speed digital hybrid PLL frequency synthesizer","authors":"Hun-Hee Lee, Wonhui Park, H. Ryu","doi":"10.1109/APMC.2005.1607062","DOIUrl":"https://doi.org/10.1109/APMC.2005.1607062","url":null,"abstract":"The conventional PLL (phase locked loop) frequency synthesizer takes a long switching time because of the inherent closed-loop structure. The digital hybrid PLL (DH-PLL) which includes the open loop structure into the conventional PLL synthesizer has been studied to overcome this problem. It operates in high speed, but the hardware complexity and power consumption are another serious problems since the DLT (digital look-up table) is usually implemented by the ROM which contains the transfer characteristic of VCO (voltage controlled oscillator). This paper proposes a new DH-PLL using a very simple DLT-replacement digital logic instead of the complex ROM-type DLT. Also, a timing synchronization circuit makes the negligible overshoot and much shorter settling time for the ultra fast switching speed. Also, the hardware complexity and power consumption get decreased to about 28%, compared with the conventional DH-PLL.","PeriodicalId":253574,"journal":{"name":"2005 Asia-Pacific Microwave Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124779726","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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